The International Building Code, 2018 edition, as adopted, is hereby amended as follows:
A. Chapter 1 "Scope and Administration" is amended as follows:
101.1 Title. Replace bracketed "[]" text with the following: "Ada County."
101.4.3 Plumbing. Delete section.
101.4.4 Property maintenance. Delete section.
101.4.5 Fire prevention. Delete section.
102.6 Existing Structures. Amend subsection paragraph as follows:
The legal occupancy of any structure existing on the date of adoption of this code shall be permitted to continue without change, except as otherwise specifically provided in this code, or the International Existing Building Code.
102.6.2 Buildings previously occupied. Amend subsection paragraph as follows:
The legal occupancy of any building existing on the date of adoption of this code shall be permitted to continue without change, except as otherwise specifically provided in this code, or as is deemed necessary by the building official for the general safety and welfare of the occupants and the public.
103.3 Deputies. Delete the last sentence.
104.8 Liability. Delete section.
105.1 Required. Amend subsection as follows:
Any owner or owner's authorized agent who intends to construct, enlarge, alter, repair, move, demolish, or change the occupancy of a building or structure, or to erect, install, enlarge, alter, repair, remove, convert or replace any gas or mechanical system, the installation of which is regulated by this code, or to cause any such work to be done, shall first make application to the building official and obtain the required permit.
An Ada County building division permit is issued to the owner of the property and remains tied to the specific property even as the ownership may change. The applicant for any Ada County building division permit is, by definition, a representative of the property owner and as such may not have individual control or ownership of that permit.
105.1.1 Annual permit. Amend subsection as follows:
Instead of an individual permit for each alteration to an already approved gas or mechanical installation, the building official is authorized to issue an annual permit upon application therefor to any person, firm or corporation regularly employing one or more qualified tradespersons in the building, structure or on the premises owned or operated by the applicant for the permit.
105.2 Work exempt from permit. Amend the "Building" exemptions and delete the "Electrical" and "Plumbing" paragraphs as follows:
Building:
1. One-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area is not greater than 200 square feet (18.58 m2) or 12 feet (3658 mm) in total height above adjacent grade.
2. Fences not over 6 feet (1829 mm) high.
3. Oil derricks
4. Retaining walls that are not over 4 feet (1219 mm) in height measured from the bottom of the footing to the top of the wall, unless supporting a surcharge or impounding Class I, II or IIIA liquids.
5. Water tanks supported directly on grade if the capacity is not greater than 5,000 gallons (18,925 L) and the ratio of height to diameter or width is not greater than 2:1.
6. Sidewalks and driveways not more than 30 inches (762 mm) above adjacent grade, and not over any basement or story below and are not part of an accessible route.
7. Painting, papering, tiling, carpeting, cabinets, counter tops and similar finish work.
8. Temporary motion picture, television and theater stage sets and scenery.
9. Prefabricated swimming pools accessory to a Group R-3 occupancy that are less than 24 inches (610 mm) deep, are not greater than 5,000 gallons (18,925 L) and are installed entirely above ground.
10. Shade cloth structures constructed for nursery or agricultural purposes, not including service systems.
11. Swings and other playground equipment.
12. Window awnings in Group R-3 and U occupancies, supported by an exterior wall that do not project more than 54 inches (1372 mm) from the exterior wall and do not require additional support.
13. Nonfixed and movable fixtures, cases, racks, counters and partitions not over 5 feet 9 inches (1753 mm) in height.
14. Buildings or structures used to facilitate construction projects. These buildings shall be removed from the property prior to the issuance of any Certificate of Occupancy.
15. Painted and manufactured wall signs not exceeding thirty two (32) square feet and post or pole mounted signs not exceeding thirty two (32) square feet or exceeding six (6) feet above adjacent grade in height installed in accordance with manufacturers or design professionals instructions.
Electrical: Delete electrical paragraphs contained in section 105.2.
Plumbing: Delete plumbing paragraphs contained in section 105.2.
105.2.2 Repairs. Delete section.
105.3.2 Time limitation of application. Delete paragraph and replace with the following:
Applications for which no permit is issued within 180 days following the date of eligibility for permit issuance shall expire by limitation, and plans and other data submitted for review may thereafter be returned to the applicant or destroyed by the building official. The building official may extend the time for action by the applicant for a period not exceeding 180 calendar days on request by the applicant showing that circumstances beyond the control of the applicant have prevented action from being taken. No application shall be extended more than once. In order to renew action on an application after expiration, the applicant shall resubmit plans and pay a new plan review fee.
105.5 Expiration. Add a second paragraph as follows:
If work has not been completed, the final inspection performed and the project approved for occupancy or use within three (3) years from the date of such permit being issued, such permit shall expire by limitation and become null and void. Prior to work recommencing after the permit has expired, a new permit shall be obtained. The cost of the new permit, if obtained within one year of the original permit expiration, shall be one half (1/2) of the cost of a new permit for the remaining work required to complete the structure or project.
107.1 General. Amend subsection as follows:
Submittal documents consisting of construction documents, statement of special inspections, geotechnical report and other data shall be submitted in one digital set with each permit application. The construction documents shall be prepared by a registered design professional where required by the statutes of the jurisdiction in which the project is to be constructed. Where special conditions exist, the building official is authorized to require additional construction documents to be prepared by a registered design professional.
108.1 General. Amend subsection as follows:
The building official is authorized to issue a permit for temporary structures and temporary uses. Such permits shall be limited as to time of service. Service less than thirty (30) days shall not require a permit. Service over thirty (30) days shall require a permit but shall not be permitted for more than 180 days. Permits for temporary structures shall bear fees identical to permanent structures. The building official is authorized to grant extensions for demonstrated cause.
109.3 Building permit valuations. Delete paragraph and replace with the following:
The applicant for a permit shall provide an estimated permit value at time of application. Permit valuations shall include total value of work, including materials and labor, for which the permit is being issued, such as electrical, gas, mechanical, plumbing equipment and permanent systems. The building permit valuation upon which the Ada County Building Permit fee is based shall be the project valuation as stated by the Ada County Building Permit applicant or the calculated value using the building division fees as adopted by the Board of Ada County Commissioners, whichever valuation is greatest.
109.4 Work commencing before permit issuance. Add a second paragraph as follows:
Such fee shall be an investigative fee equal to the Ada County permit fee for the work accomplished illegally, and shall be paid Ada County prior to the acceptance of an Ada County building permit application. This fee is an additional fee and shall not apply to any fee for any Ada County building permit that may subsequently be issued. Payment of the investigative fee does not vest the illegal work with any legitimacy, nor does it establish any right to an Ada County permit for continued development of that project.
109.6 Refunds. Delete sentence and replace with the following:
Eighty percent (80%) of the plan review fee shall be available for refund if no plan review has begun. Eighty percent (80%) of the building permit fee shall be available for refund if no work has begun on the project. All requests for fee refunds must be made to the building official in writing and must be made within thirty (30) days of payment of the fee in question in order to be eligible for a refund.
110.3.3. Lowest floor elevation. Add a second sentence as follows:
Development within designated flood hazard areas shall be done in conformance with the Ada County Code, Title 8, Chapter 3, Article F. Specific flood hazard area inspection results and elevation documentation shall be provided to Ada County in conformance with the Ada County Code, Title 8, Chapter 3, Article F.
111.1 Change in occupancy. Add a second paragraph as follows:
The certificate of occupancy shall be posted in a conspicuous place and shall not be removed except by the building official.
Add a new subsection 111.1.1 as follows:
111.1.1 Certificate of Completion. A Certificate of Completion may be issued in lieu of a Certificate of Occupancy when the scope of work of a permit does not change the occupant load, occupancy group or occupancy use classification of a tenant space, structure or portion of a structure.
113 Board of Appeals. Delete subsections 113.1, 113.2 and 113.3 and replace with new subsection 113.1 as follows:
113.1 General. Appeals of orders, decisions or determinations made by the building official shall be heard pursuant to Ada County Code, Title 7, Chapter 1.
114.4 Violation penalties. Amend the subsection as follows:
Any person who violates a provision of this code or fails to comply with any of the requirements thereof or who erects, constructs, alters or repairs a building or structure in violation of the approved construction documents or directive of the building official, or of a permit or certificate issued under the provisions of this code, shall be subject to the penalties as prescribed by law in Ada County Code, Title 7, Chapter 2.
115.3 Unlawful continuance. Amend the section as follows:
Any person who shall continue any work after having been served with a stop work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be subject to the penalties as prescribed by law in Ada County Code, Title 7, Chapter 2.
B. Chapter 2 "Definitions" is amended to add a new definition as follows:
PERMIT APPLICANT. The property owner or the individual that legally represents a property owner seeking permission from Ada County to construct a building or structure on a specific piece of property.
Chapter 2 "Definitions" is amended to add new definitions for "Mass Timber" and "Noncombustible Protection (for Mass Timber)," and amend the definitions of "Secondary Members," and "Wall, Load-Bearing" as follows:
MASS TIMBER. Structural elements of Type IV construction primarily of solid, built-up, panelized or engineered wood products that meet minimum cross-section dimensions of Type IV construction.
NONCOMBUSTIBLE PROTECTION (FOR MASS TIMBER). Noncombustible material, in accordance with Section 703.8, designed to increase the fire-resistance rating and delay the combustion of mass timber.
SECONDARY STRUCTURAL MEMBERS. The following structural members shall be considered secondary members and not part of the primary structural frame:
1. Structural members not having direct connections to the columns.
2. Members of the floor construction and roof construction not having direct connections to the columns.
3. Bracing members that are not designated as part of a primary structural frame or bearing wall.
WALL, LOAD-BEARING. Any wall meeting either of the following classifications:
1. Any metal or wood stud wall that supports more than 100 pounds per linear foot (1459 N/m) of vertical load in addition to its own weight.
2. Any masonry, concrete or mass timber wall that supports more than 200 pounds per linear foot (2919 N/m) of vertical load in addition to its own weight.
C. Chapter 3 "Use and Occupancy Classification" is amended as follows:
305.2.3 Five or fewer children in a dwelling unit. Delete subsection and replace with new subsection 305.2.3 as follows:
305.2.3 Twelve (12) or fewer children in a dwelling unit. A facility such as the above within a dwelling unit and having twelve (12) or fewer children receiving such day care shall be classified as a Group R-3 occupancy or shall comply with the International Residential Code.
308.2.4 Five (5) or fewer persons receiving custodial care. Delete section 308.2.4 and replace with the following:
308.2.4 Five (5) or fewer persons receiving custodial care. A facility with five (5) or fewer persons receiving custodial care shall be classified as a Group R-3 occupancy or comply with the International Residential Code.
Delete section 308.3.2 and replace with the following:
308.3.2 Five (5) or fewer persons receiving medical care. A facility with five (5) or fewer persons receiving medical care shall be classified as a group R-3 occupancy.
308.5.4 Five (5) or fewer persons receiving custodial care. Delete subsection and replace with new subsection 308.5.4 as follows:
308.5.4 Persons receiving care in a dwelling unit. A facility such as the above within a dwelling unit and having twelve (12) or fewer children receiving day care or having five (5) or fewer persons receiving custodial care shall be classified as a Group R-3 occupancy or shall comply with the International Residential Code.
310.4 Residential Group R-3. Delete the subsection and add new subsection as follows:
310.4 Residential Group R-3. Residential Group R-3 occupancies where the occupants are primarily permanent in nature and not classified as Group R-1, R-2, R-4, E or I, including:
1. Buildings that do not contain more than two (2) dwelling units;
2. Care facilities that provide accommodations for five (5) or fewer persons receiving personal care, custodial care or medical care;
3. Congregate living facilities (nontransient) with sixteen (16) or fewer occupants, including boarding houses (nontransient), convents, dormitories, fraternities and sororities and monasteries;
4. Congregate living facilities (transient) with ten (10) or fewer occupants including boarding houses (transient);
5. Dwelling units providing day care for twelve (12) or fewer children; or
6. Lodging houses (transient) with five (5) or fewer guest rooms and ten (10) or fewer occupants.
310.4.1 Care facilities within a dwelling. Delete paragraph and replace with new paragraph as follows:
310.4.1 Care facilities within a dwelling. Care facilities for twelve (12) or fewer children receiving day care or for five (5) or fewer persons receiving personal care or custodial care that are within a one or two family dwelling are permitted to comply with the International Residential Code.
D. Chapter 4 "Special Detailed Requirements Based on Occupancy and Use," is amended as follows:
Amend Section 403.3.2 Water supply to required fire pumps as follows:
403.3.2 Water supply to required fire pumps. In all buildings that are more than 420 feet (128 m) in building height and buildings of Type IVA and IVB construction that are more than 120 feet (36 576 mm) in building height, required fire pumps shall be supplied by connections to not fewer than two water mains located in different streets. Separate supply piping shall be provided between each connection to the water main and the pumps. Each connection and the supply piping between the connection and the pumps shall be sized to supply the flow and pressure required for the pumps to operate.
Exception: Two connections to the same main shall be permitted provided that the main is valved such that an interruption can be isolated so that the water supply will continue without interruption through not fewer than one of the connections.
E. Chapter 5 "General building Heights and Areas" is amended as follows:
Table 504.3 "Allowable Building Height in Feet Above Grade Plane" is deleted and a new Table 504.3 "Allowable Building Height in Feet Above Grade Plane" is added as follows:
TABLE 504.3
ALLOWABLE BUILDING HEIGHT IN FEET ABOVE GRADE PLANEa
OCCUPANCY CLASSIFICATION | TYPE OF CONSTRUCTION | ||||||||||||
See Footnotes | Type I | Type II | Type III | Type IV | Type V | ||||||||
A | B | A | B | A | B | A | B | C | HT | A | B | ||
OCCUPANCY CLASSIFICATION | TYPE OF CONSTRUCTION | ||||||||||||
See Footnotes | Type I | Type II | Type III | Type IV | Type V | ||||||||
A | B | A | B | A | B | A | B | C | HT | A | B | ||
A, B, E, F, M, S, U | NSb | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 |
S | UL | 180 | 85 | 75 | 85 | 75 | 270 | 180 | 85 | 85 | 70 | 60 | |
H-1, H-2, H-3, H-5 | NSc, d | UL | 160 | 65 | 55 | 65 | 55 | 120 | 90 | 65 | 65 | 50 | 40 |
S | |||||||||||||
H-4 | NSc, d | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 |
S | UL | 180 | 85 | 75 | 85 | 75 | 140 | 100 | 85 | 85 | 70 | 60 | |
I-1 Condition 1, I-3 | NSd, e | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 |
S | UL | 180 | 85 | 75 | 85 | 75 | 180 | 120 | 85 | 85 | 70 | 60 | |
I-1 Condition 2, I-2 | NSd, e, f | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 |
S | UL | 180 | 85 | ||||||||||
I-4 | NSd, g | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 |
S | UL | 180 | 85 | 75 | 85 | 75 | 180 | 120 | 85 | 85 | 70 | 60 | |
Rh | NSd | UL | 160 | 65 | 55 | 65 | 55 | 65 | 65 | 65 | 65 | 50 | 40 |
S13D | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 50 | 40 | |
S13R | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | 60 | |
S | UL | 180 | 85 | 75 | 85 | 75 | 270 | 180 | 85 | 85 | 70 | 60 | |
For SI: 1 foot = 304.8 mm. UL = Unlimited; NS = Buildings not equipped throughout with an automatic sprinkler system; S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1; S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2; S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3. a. See Chapters 4 and 5 for specific exceptions to the allowable height in this chapter. b. See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies. c. New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5. d. The NS value is only for use in evaluation of existing building height in accordance with the International Existing Building Code. e. New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies Condition 1, see Exception 1 of Section 903.2.6. f. New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and Section 1103.5 of the International Fire Code. g. For new Group I-4 occupancies, see Exceptions 2 and 3 of Section 903.2.6. h. New Group R occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8. | |||||||||||||
Table 504.4 "Allowable Number of Stories Above Grade Plan" is deleted and a new Table 504.4 "Allowable Number of Stories Above Grade Plan" is added as follows:
TABLE 504.4
ALLOWABLE NUMBER OF STORIES ABOVE GRADE PLANEa, b
OCCUPANCY CLASSIFICATION | TYPE OF CONSTRUCTION | ||||||||||||
See Footnotes | Type I | Type II | Type III | Type IV | Type V | ||||||||
A | B | A | B | A | B | A | B | C | HT | A | B | ||
OCCUPANCY CLASSIFICATION | TYPE OF CONSTRUCTION | ||||||||||||
See Footnotes | Type I | Type II | Type III | Type IV | Type V | ||||||||
A | B | A | B | A | B | A | B | C | HT | A | B | ||
A-1 | NS | UL | 5 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 2 | 1 |
S | UL | 6 | 4 | 3 | 4 | 3 | 9 | 6 | 4 | 4 | 3 | 2 | |
A-2 | NS | UL | 11 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 2 | 1 |
S | UL | 12 | 4 | 3 | 4 | 3 | 18 | 12 | 6 | 4 | 3 | 2 | |
A-3 | NS | UL | 11 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 2 | 1 |
S | UL | 12 | 4 | 3 | 4 | 3 | 18 | 12 | 6 | 4 | 3 | 2 | |
A-4 | NS | UL | 11 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 2 | 1 |
S | UL | 12 | 4 | 3 | 4 | 3 | 18 | 12 | 6 | 4 | 3 | 2 | |
A-5 | NS | UL | UL | UL | UL | UL | UL | 1 | 1 | 1 | UL | UL | UL |
S | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL | |
B | NS | UL | 11 | 5 | 3 | 5 | 3 | 5 | 5 | 5 | 5 | 3 | 2 |
S | UL | 12 | 6 | 4 | 6 | 4 | 18 | 12 | 9 | 6 | 4 | 3 | |
E | NS | UL | 5 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 1 | 1 |
S | UL | 6 | 4 | 3 | 4 | 3 | 9 | 6 | 4 | 4 | 2 | 2 | |
F-1 | NS | UL | 11 | 4 | 2 | 3 | 2 | 3 | 3 | 3 | 4 | 2 | 1 |
S | UL | 12 | 5 | 3 | 4 | 3 | 10 | 7 | 5 | 5 | 3 | 2 | |
F-2 | NS | UL | 11 | 5 | 3 | 4 | 3 | 5 | 5 | 5 | 5 | 3 | 2 |
S | UL | 12 | 6 | 4 | 5 | 4 | 12 | 8 | 6 | 6 | 4 | 3 | |
H-1 | NSc, d | 1 | 1 | 1 | 1 | 1 | 1 | NP | NP | NP | 1 | 1 | NP |
S | 1 | 1 | 1 | ||||||||||
H-2 | NSc, d | UL | 3 | 2 | 1 | 2 | 1 | 1 | 1 | 1 | 2 | 1 | 1 |
S | 2 | 2 | 2 | ||||||||||
H-3 | NSc, d | UL | 6 | 4 | 2 | 4 | 2 | 3 | 3 | 3 | 4 | 2 | 1 |
S | 4 | 4 | 4 | ||||||||||
H-4 | NSc, d | UL | 7 | 5 | 3 | 5 | 3 | 5 | 5 | 5 | 5 | 3 | 2 |
S | UL | 8 | 6 | 4 | 6 | 4 | 8 | 7 | 6 | 6 | 4 | 3 | |
H-5 | NSc, d | 4 | 4 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 3 | 3 | 2 |
S | 3 | 3 | 3 | ||||||||||
I-1 Condition 1 | NSd, e | UL | 9 | 4 | 3 | 4 | 3 | 4 | 4 | 4 | 4 | 3 | 2 |
S | UL | 10 | 5 | 4 | 5 | 4 | 10 | 7 | 5 | 5 | 4 | 3 | |
I-1 Condition 2 | NSd, e | UL | 9 | 4 | 3 | 4 | 3 | 3 | 3 | 3 | 4 | 3 | 2 |
S | UL | 10 | 5 | 10 | 6 | 4 | |||||||
I-2 | NSd, f | UL | 4 | 2 | 1 | 1 | NP | NP | NP | NP | 1 | 1 | NP |
S | UL | 5 | 3 | 7 | 5 | 1 | |||||||
I-3 | NSd, e | UL | 4 | 2 | 1 | 2 | 1 | 2 | 2 | 2 | 2 | 2 | 1 |
S | UL | 5 | 3 | 2 | 3 | 2 | 7 | 5 | 3 | 3 | 3 | 2 | |
I-4 | NSd, g | UL | 5 | 3 | 2 | 3 | 2 | 3 | 3 | 3 | 3 | 1 | 1 |
S | UL | 6 | 4 | 3 | 4 | 3 | 9 | 6 | 4 | 4 | 2 | 2 | |
M | NS | UL | 11 | 4 | 2 | 4 | 2 | 4 | 4 | 4 | 4 | 3 | 1 |
S | UL | 12 | 5 | 3 | 5 | 3 | 12 | 8 | 6 | 5 | 4 | 2 | |
R-1h | NSd | UL | 11 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 2 |
S13R | 4 | 4 | 4 | 3 | |||||||||
S | UL | 12 | 5 | 5 | 5 | 5 | 18 | 12 | 8 | 5 | 4 | 3 | |
R-2h | NSd | UL | 11 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 2 |
S13R | 4 | 4 | 4 | 4 | 3 | ||||||||
S | UL | 12 | 5 | 5 | 5 | 5 | 18 | 12 | 8 | 5 | 4 | 3 | |
R-3h | NSd | UL | 11 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 3 |
S13D | 4 | 4 | 3 | 3 | |||||||||
S13R | 4 | 4 | 4 | 4 | |||||||||
S | UL | 12 | 5 | 5 | 5 | 5 | 18 | 12 | 5 | 5 | 4 | 4 | |
R-4h | NSd | UL | 11 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 3 | 2 |
S13D | 4 | 4 | 3 | 2 | |||||||||
S13R | 4 | 4 | 4 | 3 | |||||||||
S | UL | 12 | 5 | 5 | 5 | 5 | 18 | 12 | 5 | 5 | 4 | 3 | |
S-1 | NS | UL | 11 | 4 | 2 | 3 | 2 | 4 | 4 | 4 | 4 | 3 | 1 |
S | UL | 12 | 5 | 4 | 4 | 4 | 10 | 7 | 5 | 5 | 4 | 2 | |
S-2 | NS | UL | 11 | 5 | 3 | 4 | 3 | 4 | 4 | 4 | 5 | 4 | 2 |
S | UL | 12 | 6 | 4 | 5 | 4 | 12 | 8 | 5 | 6 | 5 | 3 | |
U | NS | UL | 5 | 4 | 2 | 3 | 2 | 4 | 4 | 4 | 4 | 2 | 1 |
S | UL | 6 | 5 | 3 | 4 | 3 | 9 | 6 | 5 | 5 | 3 | 2 | |
UL = Unlimited; NP = Not Permitted; NS = Buildings not equipped throughout with an automatic sprinkler system; S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1; S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2; S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3. a. See Chapters 4 and 5 for specific exceptions to the allowable height in this chapter. b. See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies. c. New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5. d. The NS value is only for use in evaluation of existing building height in accordance with the International Existing Building Code. e. New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies, Condition 1, see Exception 1 of Section 903.2.6. f. New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and 1103.5 of the International Fire Code. g. For new Group I-4 occupancies, see Exceptions 2 and 3 of Section 903.2.6. h. New Group R occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8. | |||||||||||||
Table 506.2 "Allowable Area Factor in Square Feet" is deleted and a new Table 506.2 "Allowable Area Factor in Square Feet" is added as follows:
TABLE 506.2
ALLOWABLE AREA FACTOR (At = NS, S1, S13R, S13D or SM, as applicable) IN SQUARE FEETa, b
OCCUPANCY CLASSIFICATION | TYPE OF CONSTRUCTION | ||||||||||||
SEE FOOT- NOTES | Type I | Type II | Type III | Type IV | Type V | ||||||||
A | B | A | B | A | B | A | B | C | HT | A | B | ||
OCCUPANCY CLASSIFICATION | TYPE OF CONSTRUCTION | ||||||||||||
SEE FOOT- NOTES | Type I | Type II | Type III | Type IV | Type V | ||||||||
A | B | A | B | A | B | A | B | C | HT | A | B | ||
A-1 | NS | UL | UL | 15,500 | 8,500 | 14,000 | 8,500 | 45,000 | 30,000 | 18,750 | 15,000 | 11,500 | 5,500 |
S1 | UL | UL | 62,000 | 34,000 | 56,000 | 34,000 | 180,000 | 120,000 | 75,000 | 60,000 | 46,000 | 22,000 | |
SM | UL | UL | 46,500 | 25,500 | 42,000 | 25,500 | 135,000 | 90,000 | 56,250 | 45,000 | 34,500 | 16,500 | |
A-2 | NS | UL | UL | 15,500 | 9,500 | 14,000 | 9,500 | 45,000 | 30,000 | 18,750 | 15,000 | 11,500 | 6,000 |
S1 | UL | UL | 62,000 | 38,000 | 56,000 | 38,000 | 180,000 | 120,000 | 75,000 | 60,000 | 46,000 | 24,000 | |
SM | UL | UL | 46,500 | 28,500 | 42,000 | 28,500 | 135,000 | 90,000 | 56,250 | 45,000 | 34,500 | 18,000 | |
A-3 | NS | UL | UL | 15,500 | 9,500 | 14,000 | 9,500 | 45,000 | 30,000 | 18,750 | 15,000 | 11,500 | 6,000 |
S1 | UL | UL | 62,000 | 38,000 | 56,000 | 38,000 | 180,000 | 120,000 | 75,000 | 60,000 | 46,000 | 24,000 | |
SM | UL | UL | 46,500 | 28,500 | 42,000 | 28,500 | 135,000 | 90,000 | 56,250 | 45,000 | 34,500 | 18,000 | |
A-4 | NS | UL | UL | 15,500 | 9,500 | 14,000 | 9,500 | 45,000 | 30,000 | 18,750 | 15,000 | 11,500 | 6,000 |
S1 | UL | UL | 62,000 | 38,000 | 56,000 | 38,000 | 180,000 | 120,000 | 75,000 | 60,000 | 46,000 | 24,000 | |
SM | UL | UL | 46,500 | 28,500 | 42,000 | 28,500 | 135,000 | 90,000 | 56,250 | 45,000 | 34,500 | 18,000 | |
A-5 | NS | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL |
S1 | |||||||||||||
SM | |||||||||||||
B | NS | UL | UL | 37,500 | 23,000 | 28,500 | 19,000 | 108,000 | 72,000 | 45,000 | 36,000 | 18,000 | 9,000 |
S1 | UL | UL | 150,000 | 92,000 | 114,000 | 76,000 | 432,000 | 288,000 | 180,000 | 144,000 | 72,000 | 36,000 | |
SM | UL | UL | 112,500 | 69,000 | 85,500 | 57,000 | 324,000 | 216,000 | 135,000 | 108,000 | 54,000 | 27,000 | |
E | NS | UL | UL | 26,500 | 14,500 | 23,500 | 14,500 | 76,500 | 51,000 | 31,875 | 25,500 | 18,500 | 9,500 |
S1 | UL | UL | 106,000 | 58,000 | 94,000 | 58,000 | 306,000 | 204,000 | 127,500 | 102,000 | 74,000 | 38,000 | |
SM | UL | UL | 79,500 | 43,500 | 70,500 | 43,500 | 229,500 | 153,000 | 95,625 | 76,500 | 55,500 | 28,500 | |
F-1 | NS | UL | UL | 25,000 | 15,500 | 19,000 | 12,000 | 100,500 | 67,000 | 41,875 | 33,500 | 14,000 | 8,500 |
S1 | UL | UL | 100,000 | 62,000 | 76,000 | 48,000 | 402,000 | 268,000 | 167,500 | 134,000 | 56,000 | 34,000 | |
SM | UL | UL | 75,000 | 46,500 | 57,000 | 36,000 | 301,500 | 201,000 | 125,625 | 100,500 | 42,000 | 25,500 | |
F-2 | NS | UL | UL | 37,500 | 23,000 | 28,500 | 18,000 | 151,500 | 101,000 | 63,125 | 50,500 | 21,000 | 13,000 |
S1 | UL | UL | 150,000 | 92,000 | 114,000 | 72,000 | 606,000 | 404,000 | 252,500 | 202,000 | 84,000 | 52,000 | |
SM | UL | UL | 112,500 | 69,000 | 85,500 | 54,000 | 454,500 | 303,000 | 189,375 | 151,500 | 63,000 | 39,000 | |
H-1 | NSc | 21,000 | 16,500 | 11,000 | 7,000 | 9,500 | 7,000 | 10,500 | 10,500 | 10,500 | 10,500 | 7,500 | NP |
S1 | |||||||||||||
H-2 | NSc | 21,000 | 16,500 | 11,000 | 7,000 | 9,500 | 7,000 | 10,500 | 10,500 | 10,500 | 10,500 | 7,500 | 3,000 |
S1 | |||||||||||||
SM | |||||||||||||
H-3 | NSc | UL | 60,000 | 26,500 | 14,000 | 17,500 | 13,000 | 25,500 | 25,500 | 25,500 | 25,500 | 10,000 | 5,000 |
S1 | |||||||||||||
SM | |||||||||||||
H-4 | NSc, d | UL | UL | 37,500 | 17,500 | 28,500 | 17,500 | 72,000 | 54,000 | 40,500 | 36,000 | 18,000 | 6,500 |
S1 | UL | UL | 150,000 | 70,000 | 114,000 | 70,000 | 288,000 | 216,000 | 162,000 | 144,000 | 72,000 | 26,000 | |
SM | UL | UL | 112,500 | 52,500 | 85,500 | 52,500 | 216,000 | 162,000 | 121,500 | 108,000 | 54,000 | 19,500 | |
H-5 | NSc, d | UL | UL | 37,500 | 23,000 | 28,500 | 19,000 | 72,000 | 54,000 | 40,500 | 36,000 | 18,000 | 9,000 |
S1 | UL | UL | 150,000 | 92,000 | 114,000 | 76,000 | 288,000 | 216,000 | 162,000 | 144,000 | 72,000 | 36,000 | |
SM | UL | UL | 112,500 | 69,000 | 85,500 | 57,000 | 216,000 | 162,000 | 121,500 | 108000 | 54,000 | 27,000 | |
I-1 | NSd, e | UL | 55,000 | 19,000 | 10,000 | 16,500 | 10,000 | 54,000 | 36,000 | 18,000 | 18,000 | 10,500 | 4,500 |
S1 | UL | 220,000 | 76,000 | 40,000 | 66,000 | 40,000 | 216,000 | 144,000 | 72,000 | 72,000 | 42,000 | 18,000 | |
SM | UL | 165,000 | 57,000 | 30,000 | 49,500 | 30,000 | 162,000 | 108,000 | 54,000 | 54,000 | 31,500 | 13,500 | |
I-2 | NSd, f | UL | UL | 15,000 | 11,000 | 12,000 | NP | 36,000 | 24,000 | 12,000 | 12,000 | 9,500 | NP |
S1 | UL | UL | 60,000 | 44,000 | 48,000 | NP | 144,000 | 96,000 | 48,000 | 48,000 | 38,000 | NP | |
SM | UL | UL | 45,000 | 33,000 | 36,000 | NP | 108,000 | 72,000 | 36,000 | 36,000 | 28,500 | NP | |
I-3 | NSd, e | UL | UL | 15,000 | 10,000 | 10,500 | 7,500 | 36,000 | 24,000 | 12,000 | 12,000 | 7,500 | 5,000 |
S1 | UL | UL | 60,000 | 40,000 | 42,000 | 30,000 | 144,000 | 96,000 | 48,000 | 48,000 | 30,000 | 20,000 | |
SM | UL | UL | 45,000 | 30,000 | 31,500 | 22,500 | 108,000 | 72,000 | 36,000 | 36,000 | 22,500 | 15,000 | |
I-4 | NSd, g | UL | 60,500 | 26,500 | 13,000 | 23,500 | 13,000 | 76,500 | 51,000 | 25,500 | 25,500 | 18,500 | 9,000 |
S1 | UL | 121,000 | 106,000 | 52,000 | 94,000 | 52,000 | 306,000 | 204,000 | 102,000 | 102,000 | 74,000 | 36,000 | |
SM | UL | 181,500 | 79,500 | 39,000 | 70,500 | 39,000 | 229,500 | 153,000 | 76,500 | 76,500 | 55,500 | 27,000 | |
M | NS | UL | UL | 21,500 | 12,500 | 18,500 | 12,500 | 61,500 | 41,000 | 26,625 | 20,500 | 14,000 | 9,000 |
S1 | UL | UL | 86,000 | 50,000 | 74,000 | 50,000 | 246,000 | 164,000 | 102,500 | 82,000 | 56,000 | 36,000 | |
SM | UL | UL | 64,500 | 37,500 | 55,500 | 37,500 | 184,500 | 123,000 | 76,875 | 61,500 | 42,000 | 27,000 | |
R-1h | NSd | UL | UL | 24,000 | 16,000 | 24,000 | 16,000 | 61,500 | 41,000 | 25,625 | 20,500 | 12,000 | 7,000 |
S13R | |||||||||||||
S1 | UL | UL | 96,000 | 64,000 | 96,000 | 64,000 | 246,000 | 164,000 | 102,500 | 82,000 | 48,000 | 28,000 | |
SM | UL | UL | 72,000 | 48,000 | 72,000 | 48,000 | 184,500 | 123,000 | 76,875 | 61,500 | 36,000 | 21,000 | |
R-2h | NSd | UL | UL | 24,000 | 16,000 | 24,000 | 16,000 | 61,500 | 41,000 | 25,625 | 20,500 | 12,000 | 7,000 |
S13R | |||||||||||||
S1 | UL | UL | 96,000 | 64,000 | 96,000 | 64,000 | 246,000 | 164,000 | 102,500 | 82,000 | 48,000 | 28,000 | |
SM | UL | UL | 72,000 | 48,000 | 72,000 | 48,000 | 184,500 | 123,000 | 76,875 | 61,500 | 36,000 | 21,000 | |
R-3h | NSd | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL | UL |
S13D | |||||||||||||
S13R | |||||||||||||
S1 | |||||||||||||
SM | |||||||||||||
R-4h | NSd | UL | UL | 24,000 | 16,000 | 24,000 | 16,000 | 61,500 | 41,000 | 25,625 | 20,500 | 12,000 | 7,000 |
S13D | |||||||||||||
S13R | |||||||||||||
S1 | UL | UL | 96,000 | 64,000 | 96,000 | 64,000 | 246,000 | 164,000 | 102,500 | 82,000 | 48,000 | 28,000 | |
SM | UL | UL | 72,000 | 48,000 | 72,000 | 48,000 | 184,500 | 123,000 | 76,875 | 61,500 | 36,000 | 21,000 | |
S-1 | NS | UL | 48,000 | 26,000 | 17,500 | 26,000 | 17,500 | 76,500 | 51,000 | 31,875 | 25,500 | 14,000 | 9,000 |
S1 | UL | 192,000 | 104,000 | 70,000 | 104,000 | 70,000 | 306,000 | 204,000 | 127,500 | 102,000 | 56,000 | 36,000 | |
SM | UL | 144,000 | 78,000 | 52,500 | 78,000 | 52,500 | 229,500 | 153,000 | 95,625 | 76,500 | 42,000 | 27,000 | |
S-2 | NS | UL | 79,000 | 39,000 | 26,000 | 39,000 | 26,000 | 115,500 | 77,000 | 48,125 | 38,500 | 21,000 | 13,500 |
S1 | UL | 316,000 | 156,000 | 104,000 | 156,000 | 104,000 | 462,000 | 308,000 | 192,500 | 154,000 | 84,000 | 54,000 | |
SM | UL | 237,000 | 117,000 | 78,000 | 117,000 | 78,000 | 346,500 | 231,000 | 144,375 | 115,500 | 63,000 | 40,500 | |
U | NSi | UL | 35,500 | 19,000 | 8,500 | 14,000 | 8,500 | 54,000 | 36,000 | 22,500 | 18,000 | 9,000 | 5,500 |
S1 | UL | 142,000 | 76,000 | 34,000 | 56,000 | 34,000 | 216,000 | 144,000 | 90,000 | 72,000 | 36,000 | 22,000 | |
SM | UL | 106,500 | 57,000 | 25,500 | 42,000 | 25,500 | 162,000 | 108,000 | 67,500 | 54,000 | 27,000 | 16,500 | |
For SI: 1 square foot = 0.0929 m2. UL = Unlimited; NP = Not Permitted; NS = Buildings not equipped throughout with an automatic sprinkler system; S1 = Buildings a maximum of one story above grade plane equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1; SM = Buildings two or more stories above grade plane equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1; S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2; S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3. a. See Chapters 4 and 5 for specific exceptions to the allowable area in this chapter. b. See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies. c. New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5. d. The NS value is only for use in evaluation of existing building area in accordance with the International Existing Building Code. e. New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies, Condition 1, see Exception 1 of Section 903.2.6. f. New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and Section 1103.5 of the International Fire Code. g. New Group I-4 occupancies see Exceptions 2 and 3 of Section 903.2.6. h. New Group R occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8. i. The maximum allowable area for a single-story nonsprinklered Group U greenhouse is permitted to be 9,000 square feet, or the allowable area shall be permitted to comply with Table C102.1 of Appendix C. | |||||||||||||
508.4.4.1 Construction. Amend paragraph as follows:
508.4.4.1 Construction. Required separations shall be fire barriers constructed in accordance with Section 707 or horizontal assemblies constructed in accordance with Section 711, or both, so as to completely separate adjacent occupancies. Mass timber elements serving as fire barriers or horizontal assemblies to separate occupancies in Type IV-B or IV-C construction shall be separated from the interior of the building with an approved thermal barrier consisting of gypsum board that is not less than 1/2 inch (12.7 mm) in thickness or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275.
Add new Section 509.4.1.1 "Type IV-B and IV-C construction" as follows:
509.4.1.1 Type IV-B and IV-C construction. Where Table 509 specifies a fire-resistance-rated separation, mass timber elements serving as fire barriers or horizontal assemblies in Type IV-B or IV-C construction shall be separated from the interior of the incidental use with an approved thermal barrier consisting of gypsum board that is not less than 1/2 inch (12.7 mm) in thickness or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275.
F. Chapter 6 "Types of Construction" is amended as follows:
Table 601 “Fire-Resistance Rating Requirements for Building Elements (Hours)” is deleted and a new Table 601 "Fire-Resistance Rating Requirements for Building Elements (Hours") is added as follows:
TABLE 601
FIRE-RESISTANCE RATING REQUIREMENTS FOR BUILDING ELEMENTS (HOURS)
BUILDING ELEMENT | TYPE I | TYPE II | TYPE III | TYPE IV | TYPE V | |||||||
A | B | A | B | A | B | A | B | C | HT | A | B | |
BUILDING ELEMENT | TYPE I | TYPE II | TYPE III | TYPE IV | TYPE V | |||||||
A | B | A | B | A | B | A | B | C | HT | A | B | |
Primary structural framef (see Section 202) | 3a, b | 2a, b, c | 1b, c | 0c | 1b, c | 0 | 3a | 2a | 2a | H | 1b, c | 0 |
Bearing walls | ||||||||||||
Exteriore,f | 3 | 2 | 1 | 0 | 2 | 2 | 3 | 2 | 2 | 2 | 1 | 0 |
Interior | 3a | 2a | 1 | 0 | 1 | 0 | 3 | 2 | 2 | 1/HTg | 1 | 0 |
Nonbearing walls and partitions Exterior | See Table 705.5 | |||||||||||
Nonbearing walls and partitions Interiord | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | See Section 2304.11.2 | 0 | 0 |
Floor construction and associated secondary structural members (see Section 202) | 2 | 2 | 1 | 0 | 1 | 0 | 2 | 2 | 2 | HT | 1 | 0 |
Roof construction and associated secondary structural members (see Section 202) | 1 1/2b | 1b,c | 1b,c | 0c | 1b,c |
0 | 1 1/2 |
1 | 1 | HT | 1b,c |
0 |
For SI: 1 foot = 304.8 mm. a. Roof supports: Fire-resistance ratings of primary structural frame and bearing walls are permitted to be reduced by 1 hour where supporting a roof only. b. Except in Group F-1, H, M and S-1 occupancies, fire protection of structural members in roof construction shall not be required, including protection of primary structural frame members, roof framing and decking where every part of the roof construction is 20 feet or more above any floor immediately below. Fire-retardant-treated wood members shall be allowed to be used for such unprotected members. c. In all occupancies, heavy timber complying with Section 2304.11 shall be allowed for roof construction, including primary structural frame members, where a 1-hour or less fire-resistance rating is required. d. Not less than the fire-resistance rating required by other sections of this code. e. Not less than the fire-resistance rating based on fire separation distance (see Table 705.5). f. Not less than the fire-resistance rating as referenced in Section 704.10. g. Heavy timber bearing walls supporting more than two floors or more than a floor and a roof shall have a fire resistance rating of not less than 1 hour. | ||||||||||||
Add a new Section 602.1.2 Alternative provisions as follows:
602.1.2 Alternative provisions. As an alternative to the construction types defined in Sections 602.2 through 602.5, building and structures erected or to be erected, altered, or extended in height or area may be classified as construction type IV-A, IV-B, or IV-C in accordance with the provisions of Section 602.4 Type IV construction and shall comply with the provisions of Section 602.4 and all other applicable provisions of this code.
Section 602.4 Type IV is deleted in its entirely and a new Section 602.4 Type IV is added as follows:
602.4 Type IV. Type IV construction is that type of construction in which the building elements are mass timber or noncombustible materials and have fire-resistance ratings in accordance with Table 601. Mass timber elements shall meet the fire-resistance-rating requirements of this section based on either the fire-resistance rating of the noncombustible protection, the mass timber, or a combination of both and shall be determined in accordance with Section 703.2. The minimum dimensions and permitted materials for building elements shall comply with the provisions of this section and Section 2304.11. Mass timber elements of Types IV-A, IV-B and IV-C construction shall be protected with noncombustible protection applied directly to the mass timber in accordance with Sections 602.4.1 through 602.4.3. The time assigned to the noncombustible protection shall be determined in accordance with Section 703.8 and comply with Section 722.7.
Cross-laminated timber shall be labeled as conforming to ANSI/APA PRG 320 as referenced in section 2303.1.4.
Exterior load-bearing walls and nonload-bearing walls shall be mass timber construction or shall be of noncombustible construction.
Exception: Exterior load-bearing walls and nonloadbearing walls of Type IV-HT Construction in accordance with Section 602.4.4.
The interior building elements, including nonload-bearing walls and partitions, shall be of mass timber construction or of noncombustible construction.
Exception: Interior building elements and nonload-bearing walls and partitions of Type IV-HT construction in accordance with Section 602.4.4.
Combustible concealed spaces are not permitted except as otherwise indicated in Sections 602.4.1 through 602.4.4 Combustible stud spaces within light frame walls of Type IV-HT construction shall not be considered concealed spaces, but shall comply with Section 718.
In buildings of Type IV-A, IV-B, and IV-C construction with an occupied floor located more than 75 feet (22 860 mm) above the lowest level of fire department access, up to and including 12 stories or 180 feet (54 864 mm) above grade plane, mass timber interior exit and elevator hoistway enclosures shall be protected in accordance with Section 602.4.1.2. In buildings greater than 12 stories or 180 feet (54 864 mm) above grade plane, interior exit and elevator hoistway enclosures shall be constructed of noncombustible materials.
602.4.1 Type IV-A. Building elements in Type IV-A construction shall be protected in accordance with Sections 602.4.1.1 through 602.4.1.6. The required fire-resistance rating of noncombustible elements and protected mass timber elements shall be determined in accordance with Section 703.2.
602.4.1.1 Exterior protection. The outside face of exterior walls of mass timber construction shall be protected with noncombustible protection with a minimum assigned time of 40 minutes, as specified in Table 722.7.1(1). Components of the exterior wall covering shall be of noncombustible material except water-resistive barriers having a peak heat release rate of less than 150kW/m2, a total heat release of less than 20 MJ/m2 and an effective heat of combustion of less than 18MJ/kg as determined in accordance with ASTM E1354 and having a flame spread index of 25 or less and a smoke-developed index of 450 or less as determined in accordance with ASTM E84 or UL 723. The ASTM E1354 test shall be conducted on specimens at the thickness intended for use, in the horizontal orientation and at an incident radiant heat flux of 50 kW/m2.
602.4.1.2 Interior protection. Interior faces of all mass timber elements, including the inside faces of exterior mass timber walls and mass timber roofs, shall be protected with materials complying with Section 703.3.
602.4.1.2.1 Protection time. Noncombustible protection shall contribute a time equal to or greater than times assigned in Table 722.7.1(1), but not less than 80 minutes. The use of materials and their respective protection contributions specified in Table 722.7.1(2) shall be permitted to be used for compliance with Section 722.7.1.
602.4.1.3 Floors. The floor assembly shall contain a noncombustible material not less than 1 inch (25 mm) in thickness above the mass timber. Floor finishes in accordance with Section 804 shall be permitted on top of the noncombustible material. The underside of floor assemblies shall be protected in accordance with Section 602.4.1.2.
602.4.1.4 Roofs. The interior surfaces of roof assemblies shall be protected in accordance with Section 602.4.1.2. Roof coverings in accordance with Chapter 15 shall be permitted on the outside surface of the roof assembly.
602.4.1.5 Concealed spaces. Concealed spaces shall not contain combustibles other than electrical, mechanical, fire protection, or plumbing materials and equipment permitted in plenums in accordance with Section 602 of the International Mechanical Code, and shall comply with all applicable provisions of Section 718. Combustible construction forming concealed spaces shall be protected in accordance with Section 602.4.1.2.
602.4.1.6 Shafts. Shafts shall be permitted in accordance with Sections 713 and 718. Both the shaft side and room side of mass timber elements shall be protected in accordance with Section 602.4.1.2.
602.4.2 Type IV-B. Building elements in Type IV-B construction shall be protected in accordance with Sections 602.4.2.1 through 602.4.2.6. The required fire-resistance rating of noncombustible elements or mass timber elements shall be determined in accordance with Section 703.2.
602.4.2.1 Exterior protection. The outside face of exterior walls of mass timber construction shall be protected with noncombustible protection with a minimum assigned time of 40 minutes, as specified in Table 722.7.1(1). Components of the exterior wall covering shall be of noncombustible material except water-resistive barriers having a peak heat release rate of less than 150kW/m2, a total heat release of less than 20 MJ/m2 and an effective heat of combustion of less than 18MJ/kg as determined in accordance with ASTM E1354, and having a flame spread index of 25 or less and a smoke-developed index of 450 or less as determined in accordance with ASTM E84 or UL 723. The ASTM E1354 test shall be conducted on specimens at the thickness intended for use, in the horizontal orientation and at an incident radiant heat flux of 50 kW/m2.
602.4.2.2 Interior protection. Interior faces of all mass timber elements, including the inside face of exterior mass timber walls and mass timber roofs, shall be protected, as required by this section, with materials complying with Section 707.3.
602.4.2.2.1 Protection time. Noncombustible protection shall contribute a time equal to or greater than times assigned in Table 722.7.1(1), but not less than 80 minutes. The use of materials and their respective protection contributions specified in Table 722.7.1(2) shall be permitted to be used for compliance with Section 722.7.1.
602.4.2.2.2 Protected area. Interior faces of mass timber elements, including the inside face of exterior mass timber walls and mass timber roofs, shall be protected in accordance with Section 602.4.2.2.1.
Exceptions: Unprotected portions of mass timber ceilings and walls complying with Section 602.4.2.2.4 and the following:
1. Unprotected portions of mass timber ceilings and walls complying with one of the following:
1.1. Unprotected portions of mass timber ceilings, including attached beams, shall be permitted and shall be limited to an area equal to 20 percent of the floor area in any dwelling unit or fire area.
1.2. Unprotected portions of mass timber walls, including attached columns, shall be permitted and shall be limited to an area equal to 40 percent of the floor area in any dwelling unit or fire area.
1.3. Unprotected portions of both walls and ceilings of mass timber, including attached columns and beams, in any dwelling unit or fire area shall be permitted in accordance with Section 602.4.2.2.3.
2. Mass timber columns and beams that are not an integral portion of walls or ceilings, respectively, shall be permitted to be unprotected without restriction of either aggregate area or separation from one another.
602.4.2.2.3 Mixed unprotected areas. In each dwelling unit or fire area, where both portions of ceilings and portions of walls are unprotected, the total allowable unprotected area shall be determined in accordance with Equation 6-1.
(Utc/Uac) + (Utw/Uaw) 1 (Equation 6-1)
where:
Utc = Total unprotected mass timber ceiling areas.
Uac = Allowable unprotected mass timber ceiling area conforming to Exception 1.1 of Section 602.4.2.2.2.
Utw = Total unprotected mass timber wall areas.
Uaw= Allowable unprotected mass timber wall area conforming to Exception 1.2 of Section 602.4.2.2.2.
602.4.2.2.4 Separation distance between unprotected mass timber elements. In each dwelling unit or fire area, unprotected portions of mass timber walls and ceilings shall be not less than 15 feet (4572 mm) from unprotected portions of other walls and ceilings, measured horizontally along the ceiling and from other unprotected portions of walls measured horizontally along the floor.
602.4.2.3 Floors. The floor assembly shall contain a noncombustible material not less than 1 inch (25 mm) in thickness above the mass timber. Floor finishes in accordance with Section 804 shall be permitted on top of the noncombustible material. The underside of floor assemblies shall be protected in accordance with Section 602.4.1.2
602.4.2.4 Roofs. The interior surfaces of roof assemblies shall be protected in accordance with Section 602.4.2.2 except, in nonoccupiable spaces, they shall be treated as a concealed space with no portion left unprotected. Roof coverings in accordance with Chapter 15 shall be permitted on the outside surface of the roof assembly.
602.4.2.5 Concealed spaces. Concealed spaces shall not contain combustibles other than electrical, mechanical, fire protection, or plumbing materials and equipment permitted in plenums in accordance with Section 602 of the International Mechanical Code, and shall comply with all applicable provisions of Section 718. Combustible construction forming concealed spaces shall be protected in accordance with Section 602.4.1.2.
602.4.2.6 Shafts. Shafts shall be permitted in accordance with Sections 713 and 718. Both the shaft side and room side of mass timber elements shall be protected in accordance with Section 602.4.1.2.
602.4.3 Type IV-C. Building elements in Type IV-C construction shall be protected in accordance with Sections 602.4.3.1 through 602.4.3.6. The required fire-resistance rating of building elements shall be determined in accordance with Section 703.2.
602.4.3.1 Exterior protection. The exterior side of walls of combustible construction shall be protected with noncombustible protection with a minimum assigned time of 40 minutes, as determined in Table 722.7.1(1). Components of the exterior wall covering shall be of noncombustible material except water-resistive barriers having a peak heat release rate of less than 150 kW/m2, a total heat release of less than 20 MJ/m2 and an effective heat of combustion of less than 18 MJ/kg as determined in accordance with ASTM E1354 and having a flame spread index of 25 or less and a smoke-developed index of 450 or less as determined in accordance with ASTM E84 or UL 723.
The ASTM E1354 test shall be conducted on specimens at the thickness intended for use, in the horizontal orientation and at an incident radiant heat flux of 50 kW/m2.
602.4.3.2 Interior protection. Mass timber elements are permitted to be unprotected.
602.4.3.3 Floors. Floor finishes in accordance with Section 804 shall be permitted on top of the floor construction.
602.4.3.4 Roof coverings. Roof coverings in accordance with Chapter 15 shall be permitted on the outside surface of the roof assembly.
602.4.3.5 Concealed spaces. Concealed spaces shall not contain combustibles other than electrical, mechanical, fire protection, or plumbing materials and equipment permitted in plenums in accordance with Section 602 of the International Mechanical Code and shall comply with all applicable provisions of Section 718. Combustible construction forming concealed spaces shall be protected with noncombustible protection with a minimum assigned time of 40 minutes, as specified in Table 722.7.1(1).
602.4.3.6 Shafts. Shafts shall be permitted in accordance with Sections 713 and 718. Shafts and elevator hoistway and interior exit stairway enclosures shall be protected with noncombustible protection with a minimum assigned time of 40 minutes, as specified in Table 722.7.1(1), on both the inside of the shaft and the outside of the shaft.
G. Chapter 7 "Fire and Smoke Protection Features" is amended as follows:
Add a new Section 703.8 Determination of noncombustible protection time contribution as follows:
703.8 Determination of noncombustible protection time contribution.
The time, in minutes, contributed to the fire-resistance rating by the noncombustible protection of mass timber building elements, components, or assemblies, shall be established through a comparison of assemblies tested using procedures set forth in ASTM E119 or UL 263. The test assemblies shall be identical in construction, loading and materials, other than the noncombustible protection. The two test assemblies shall be tested to the same criteria of structural failure with the following conditions:
1. Test Assembly 1 shall be without protection.
2. Test Assembly 2 shall include the representative noncombustible protection. The protection shall be fully defined in terms of configuration details, attachment details, joint sealing details, accessories and all other relevant details.
The noncombustible protection time contribution shall be determined by subtracting the fire-resistance time, in minutes, of Test Assembly 1 from the fire-resistance time, in minutes, of Test Assembly 2.
Add a new Section 703.9 Sealing of adjacent mass timber elements as follows:
703.9 Sealing of adjacent mass timber elements. In buildings of Types IV-A, IV-B and IV-C construction, sealant or adhesive shall be provided to resist the passage of air in the following locations:
1. At abutting edges and intersections of mass timber building elements required to be fire-resistance rated.
2. At abutting intersections of mass timber building elements and building elements of other materials where both are required to be fire-resistance rated.
Sealants shall meet the requirements of ASTM C920. Adhesives shall meet the requirements of ASTM D3498.
Exception: Sealants or adhesives need not be provided where they are not a required component of a tested fire resistance-rated assembly.
Amend Section 704.4 Protection of secondary members as follows:
704.4 Protection of secondary structural members. Secondary structural members that are required to have protection to achieve a fire-resistance rating shall be protected by individual encasement protection.
A new Table 705.5 Fire-resistance Rating Requirements for Exterior Walls Based on Fire Separation Distance is added as follows:
TABLE 705.5
FIRE-RESISTANCE RATING REQUIREMENTS FOR EXTERIOR WALLS BASED ON FIRE SEPARATION DISTANCEa, d, g
FIRE SEPARATION DISTANCE = X (feet) | TYPE OF CONSTRUCTION | OCCUPANCY GROUP He | OCCUPANCY GROUP F-1, M, S-1f | OCCUPANCY GROUP A, B, E, F-2, I, Ri, S-2, Uh |
FIRE SEPARATION DISTANCE = X (feet) | TYPE OF CONSTRUCTION | OCCUPANCY GROUP He | OCCUPANCY GROUP F-1, M, S-1f | OCCUPANCY GROUP A, B, E, F-2, I, Ri, S-2, Uh |
X < 5b | All | 3 | 2 | 1 |
5 X < 10 | IA, IVA | 3 | 2 | 1 |
Others | 2 | 1 | 1 | |
10 X < 30 | IA, IB, IVA, IVB | 2 | 1 | 1c |
IIB, VB | 1 | 0 | 0 | |
Others | 1 | 1 | 1c | |
X 30 | All | 0 | 0 | 0 |
For SI: 1 foot = 304.8 mm. a. Load-bearing exterior walls shall also comply with the fire-resistance rating requirements of Table 601. b. See Section 706.1.1 for party walls. c. Open parking garages complying with Section 406 shall not be required to have a fire-resistance rating. d. The fire-resistance rating of an exterior wall is determined based upon the fire separation distance of the exterior wall and the story in which the wall is located. e. For special requirements for Group H occupancies, see Section 415.6. f. For special requirements for Group S aircraft hangars, see Section 412.3.1. g. Where Table 705.8 permits nonbearing exterior walls with unlimited area of unprotected openings, the required fire-resistance rating for the exterior walls is 0 hours. h. For a building containing only a Group U occupancy private garage or carport, the exterior wall shall not be required to have a fire-resistance rating where the fire separation distance is 5 feet (1523 mm) or greater. i. For a Group R-3 building of Type II-B or Type V-B construction, the exterior wall shall not be required to have a fire-resistance rating where the fire separation distance is 5 feet (1523 mm) or greater. | ||||
Add new Section 722.7 Fire-resistance rating for mass timber as follows:
722.7 Fire-resistance rating for mass timber. The required fire resistance of mass timber elements in Section 602.4 shall be determined in accordance with
Section 703.2. The fire-resistance rating of building elements shall be as required in Tables 601 and 705.5 and as specified elsewhere in this code. The fire-resistance rating of the mass timber elements shall consist of the fire resistance of the unprotected element added to the protection time of the noncombustible protection.
722.7.1 Minimum required protection. Where required by Sections 602.4.1 through 602.4.3, noncombustible protection shall be provided for mass timber building elements in accordance with Table 722.7.1(1). The rating, in minutes, contributed by the noncombustible protection of mass timber building elements, components or assemblies, shall be established in accordance with Section 703.8. The protection contributions indicated in Table 722.7.1(2) shall be deemed to comply with this requirement where installed and fastened in accordance with Section 722.7.2.
722.7.2 Installation of gypsum board noncombustible protection. Gypsum board complying with Table 722.7.1(2) shall be installed in accordance with this section.
722.7.2.1 Interior surfaces. Layers of Type X gypsum board serving as noncombustible protection for interior surfaces of wall and ceiling assemblies determined in accordance with Table 722.7.1(1) shall be installed in accordance with the following:
1. Each layer shall be attached with Type S drywall screws of sufficient length to penetrate the mass timber at least 1 inch (25 mm) when driven flush with the paper surface of the gypsum board.
Exception: The third layer, where determined necessary by Section 722.7, shall be permitted to be attached with 1-inch (25 mm) No. 6 Type S drywall screws to furring channels in accordance with AISI S220.
2. Screws for attaching the base layer shall be 12 inches (305 mm) on center in both directions.
3. Screws for each layer after the base layer shall be 12 inches (305 mm) on center in both directions and offset from the screws of the previous layers by 4 inches (102 mm) in both directions.
4. All panel edges of any layer shall be offset 18 inches (457 mm) from those of the previous layer.
5. All panel edges shall be attached with screws sized and offset as in Items 1 through 4 and placed at least 1 inch (25 mm) but not more than 2 inches (51 mm) from the panel edge.
6. All panels installed at wall-to-ceiling intersections shall be installed such that ceiling panels are installed first and the wall panels are installed after the ceiling panel has been installed and is fitted tight to the ceiling panel. Where multiple layers are required, each layer shall repeat this process.
7. All panels installed at a wall-to-wall intersection shall be installed such that the panels covering an exterior wall or a wall with a greater fire-resistance rating shall be installed first and the panels covering the other wall shall be fitted tight to the panel covering the first wall. Where multiple layers are required, each layer shall repeat this process.
8. Panel edges of the face layer shall be taped and finished with joint compound. Fastener heads shall be covered with joint compound.
9. Panel edges protecting mass timber elements adjacent to unprotected mass timber elements in accordance with Section 602.4.2.2 shall be covered with 11/4-inch (32 mm) metal corner bead and finished with joint compound.
722.7.2.2 Exterior surfaces. Layers of Type X gypsum board serving as noncombustible protection for the outside of the exterior mass timber walls determined in accordance with Table 722.7.1(1) shall be fastened 12 inches (305 mm) on center each way and 6 inches (152 mm) on center at all joints or ends. All panel edges shall be attached with fasteners located at least 1 inch (25 mm) but not more than 2 inches (51 mm) from the panel edge. Fasteners shall comply with one of the following:
1. Galvanized nails of minimum 12 gage with a 7/16-inch (11 mm) head of sufficient length to penetrate the mass timber a minimum of 1 inch (25 mm).
2. Screws that comply with ASTM C1002 (Type S, W or G) of sufficient length to penetrate the mass timber a minimum of 1 inch (25 mm).
A new Table 722.7.1(1) Protection Required from Noncombustible Covering Material is added as follows:
TABLE 722.7.1(1)
PROTECTION REQUIRED FROM NONCOMBUSTIBLE COVERING MATERIAL
REQUIRED FIRE-RESISTANCE RATING OF BUILDING ELEMENT PER TABLE 601 AND TABLE 705.5 (hours) | MINIMUM PROTECTION REQUIRED FROM NONCOMBUSTIBLE PROTECTION (minutes) |
1 | 40 |
2 | 80 |
3 or more | 120 |
A new Table 722.7.1(2) Protection Provided by Noncombustible Covering Material is added as follows:
TABLE 722.7.1(2)
PROTECTION PROVIDED BY NONCOMBUSTIBLE COVERING MATERIAL
NONCOMBUSTIBLE PROTECTION | PROTECTION CONTRIBUTION (minutes) |
1/2-inch Type X gypsum board | 25 |
5/8-inch Type X gypsum board | 40 |
H. Chapter 16 "Structural Design" is amended as follows:
1608.1 General. Delete sentence and replace with the following:
Design snow loads shall be determined in accordance with chapter 7 of ASCE 7, but the design roof load shall not be less than a uniform snow load of twenty-five (25) psf. The minimum roof snow load for Ada County shall be twenty-five (25) pounds per square foot. No reduction below that roof snow load shall be permitted.
1608.2 Ground snow loads. Delete paragraph and replace with the following:
In Ada County, the minimum ground snow load Pg shall be twenty (20) pounds per square foot. (Idaho State Climate Services, University of Idaho Dept. of Agricultural Engineering, Moscow, Idaho 83844-2040. 208-885-7004. www.uidaho.edu/climate.)
1609.1.1 Determination of wind loads. Add a first sentence to the paragraph as follows:
In Ada County a minimum wind speed of one hundred fifteen (115) mph shall be used.
1612.1 General. Add a second paragraph as follows:
Development within a designated flood hazard area shall be done in conformance with the Ada County Code, Title 8, Chapter 3, Article F. Specific flood hazard area inspection results and elevation documentation shall be provided to Ada County in conformance to Ada County Code, Title 8, Chapter 3, Article F.
1612.3 Establishment of flood hazard areas. Replace bracketed "[]" text areas with the following as appropriate: "Ada County, Idaho" and "June 19, 2020."
I. Chapter 17 "Special Inspections and Tests" is amended as follows:
Add new Section 1705.5.3 Mass timber construction as follows:
1705.5.3 Mass timber construction. Special inspections of mass timber elements in Types IV-A, IV-B and IV-C construction shall be in accordance with Table 1705.5.3.
A new Table 1705.5.3 Required Special Inspections of Mass Timber Construction is added as follows:
TABLE 1705.5.3
REQUIRED SPECIAL INSPECTIONS OF MASS TIMBER CONSTRUCTION
TYPE | CONTINUOUS SPECIAL INSPECTION | PERIODIC SPECIAL INSPECTION | ||
TYPE | CONTINUOUS SPECIAL INSPECTION | PERIODIC SPECIAL INSPECTION | ||
1. | Inspection of anchorage and connections of mass timber construction to timber deep foundation systems. | - | X | |
2. | Inspect erection of mass timber construction. | - | X | |
3. | Inspection of connections where installation methods are required to meet design loads. | |||
Threaded fasteners | Verify use of proper installation equipment. | - | X | |
Verify use of pre-drilled holes where required. | - | X | ||
Inspect screws, including diameter, length, head type, spacing, installation angle and depth. | - | X | ||
Adhesive anchors installed in horizontal or upwardly inclined orientation to resist sustained tension loads. | X | - | ||
Adhesive anchors not defined in preceding cell. | - | X | ||
Bolted connections. | - | X | ||
Concealed connections. | - | X | ||
Add new section 1705.19 Sealing of mass timber as follows:
1705.19 Sealing of mass timber. Periodic special inspections of sealants or adhesives shall be conducted where sealant or adhesive required by Section 703.9 is applied to mass timber building elements as designated in the approved construction documents.
J. Chapter 23 "Wood" is amended as follows:
A new Section 2304.10.5.5 Connection fire-resistance rating is added as follows:
2304.10.5.5 Connection fire-resistance rating. Fire-resistance ratings for connections in Type IV-A, IV-B, or IV-C construction shall be determined by one of the following:
1. Testing in accordance with Section 703.2 where the connection is part of the fire resistance test.
2. Engineering analysis that demonstrates that the temperature rise at any portion of the connection is limited to an average temperature rise of 250°F (139°C), and a maximum temperature rise of 325°F (181°C), for a time corresponding to the required fire-resistance rating of the structural element being connected. For the purposes of this analysis, the connection includes connectors, fasteners, and portions of wood members included in the structural design of the connection.
K. Chapter 29 "Plumbing Systems" is amended as follows:
Table 2902.1 Minimum Number of Required Plumbing Fixtures. Delete footnote (e) contained under Table 2902.1 and replace with new foot note (e) and add new footnote (g) in header row of table column labeled “Drinking Fountains,” to read as follows:
e. For business occupancies, excluding restaurants, and mercantile occupancies with an occupant load of thirty (30) or fewer, service sinks shall not be required.
f. Drinking fountains are not required for an occupant load of thirty (30) or fewer.
L. Chapter 33 "Safeguards During Construction" is amended as follows:
Section 3313 "Water Supply for Fire Protection" is amended as follows:
3313.1 Where required. An approved water supply for fire protection, either temporary or permanent, shall be made available as soon as combustible building materials arrive on the site, on commencement of vertical combustible construction, and on installation of a standpipe system in buildings under construction, in accordance with Sections 3313.2 through 3313.5.
Exception: The fire code official is authorized to reduce the fire-flow requirements for isolated buildings or a group of buildings in rural areas or small communities where the development of full fire-flow requirements is impractical.
3313.2 Combustible building materials. When combustible building materials of the building under construction are delivered to a site, a minimum fire flow of 500 gallons per minute (1893 L/m) shall be provided. The fire hydrant used to provide this fire flow supply shall be within 500 feet (152 m) of the combustible building materials, as measured along an approved fire apparatus access lane. Where the site configuration is such that one fire hydrant cannot be located within 500 feet (152 m) of all combustible building materials, additional fire hydrants shall be required to provide coverage in accordance with this section.
3313.3 Vertical construction of Types III, IV and V construction. Prior to commencement of vertical construction of Type III, IV or V buildings that utilize any combustible building materials, the fire flow required by Sections 3313.3.1 through 3313.3.3 shall be provided, accompanied by fire hydrants in sufficient quantity to deliver the required fire flow and proper coverage.
3313.3.1 Fire separation up to 30 feet. Where a building of Type III, IV or V construction has a fire separation distance of less than 30 feet (9144 mm) from property lot lines, and an adjacent property has an existing structure or otherwise can be built on, the water supply shall provide either a minimum of 500 gallons per minute (1893 L/m), or the entire fire flow required for the building when constructed, whichever is greater.
3313.3.2 Fire separation of 30 feet up to 60 feet. Where a building of Type III, IV or V construction has a fire separation distance of 30 feet (9144 mm) up to 60 feet (18 288 mm) from property lot lines, and an adjacent property has an existing structure or otherwise can be built on, the water supply shall provide a minimum of 500 gallons per minute (1893 L/m), or 50 percent of the fire flow required for the building when constructed, whichever is greater.
3313.3.3 Fire separation of 60 feet or greater. Where a building of Type III, IV or V construction has a fire separation of 60 feet (18 288 mm) or greater from a property lot line, a water supply of 500 gallons per minute (1893 L/m) shall be provided.
3313.4 Standpipe supply. Regardless of the presence of combustible building materials, the construction type or the fire separation distance, where a standpipe is required in accordance with Section 3313, a water supply providing a minimum flow of 500 gallons per minute (1893 L/m) shall be provided. The fire hydrant used for this water supply shall be located within 100 feet (30 480 mm) of the fire department connection supplying the standpipe.
Section 3314.1 Fire watch during combustible construction is deleted and a new section 3314.1 Fire watch during combustible construction is added as follows:
3314.1 Fire watch during combustible construction. A fire watch shall be provided during nonworking hours for construction that exceeds 40 feet (12 192 mm) in height above the lowest adjacent grade at any point along the building perimeter, for new multistory construction with an aggregate area exceeding 50,000 square feet (4645 m2) per story or as required by the fire code official.
M. Chapter 35 "Referenced Standards" is amended as follows:
Add in under the "APA" reference section the "ANSI/APA PRG 320-2019: Standard for Performance-rated Cross-laminated Timber 602.4, 2303.1.4" as follows:
APA
ANSI/APA PRG 320-2019: Standard for Performance-rated Cross-laminated Timber 602.4, 2303.1.4
Add in under the ASTM reference section the "D3498-03(2011): Standard Specification for Adhesives for Field-Gluing Plywood to Lumber Framing for Floor Systems 703.7" and change the reference of "703.7" to "703.9" to be consistent with 2018 IBC numbering for adding a new section as follows:
ASTM
D3498-03(2011): Standard Specification for Adhesives for Field-Gluing Plywood to Lumber Framing for Floor Systems 703.9. (Ord. 498, 3-25-2003; amd. Ord. 560, 8-24-2004; amd. Ord. 592, 8-2-2005; amd. Ord. 678, 11-13-2007; amd. Ord. 725, 5-5-2009; amd. Ord. 748, 4-28-2010; amd. Ord. 781, 5-17-2011; amd. Ord. 817, 1-7-2014; amd. Ord. 836, 1-6-2015; amd. Ord. 879, 2-13-2018; amd. Ord. 919, 2-16-2021; amd. Ord. 935, 3-11-2022)