The following amendments, modifications, additions, and deletions to the International Residential Code, 2021 Edition, are hereby made:
1. Amend Section R101.1, Title, to read as follows:
“These provisions shall be known as the Residential Code for One- and Two-Family Dwellings of the City of Osceola, Iowa, and shall be cited as such and will be referred to herein as ‘this code.’”
2. Delete Section R105.2, Work Exempt From Permit, (Subsection Building, Subsection 1) and replace with the following:
“1. One-story detached accessory structures, provided the floor area does not exceed 200 square feet; however, site place approval shall be obtained from the Zoning Department.”
3. Delete Section R105.2, Work Exempt From Permit, (Subsection Building, Subsection 5) and replace with the following:
“5. Sidewalks shall be permitted and installed in accordance with approved site plan for individual lot development.”
4. Delete the following subsections from Section R105.2, Work Exempt From Permit:
Building. Subsection 2. “Fences not over seven feet (2,134 mm) high.”
Building. Subsection 4. “Water tanks supported directly upon grade if the capacity does not exceed 5,000 gallons (18,927 L) and the ratio of height to diameter or width does not exceed two to one.”
Building. Subsection 10. “Decks not exceeding 200 square feet (18.58 m2) in area, that are not more than 30 inches (762 mm) above grade at any point, are not attached to a dwelling and do not serve the exit door required by Section R311.4.”
5. Amend Section R105.6, Suspension or Revocation, to include the addition of R105.6.1 Revocation of Permit.
“R105.6.1 Revocation of Permit. It is the permit holder’s responsibility to schedule the required inspections and obtain final approvals. Failure to schedule the required inspections and receive approval of work authorized by the permit before covering said work or at completion shall result in revocation of the permit and void any associated approvals granted by the City. This failure shall also equate to working without a permit in violation of the City Code and no future permits shall be issued to any person or company who has outstanding violations of this code or any other laws or ordinances of the City. Failure to contact the City for any inspection or follow-up prior to expiration of a permit shall be deemed a violation of this code section. Failure to contact the City for any inspection or follow-up prior to expiration of a Temporary Certificate of Occupancy shall also be deemed a violation of this code section. Allowing occupancy of a structure, for which a person or company holds a building permit, prior to or without a valid Certificate of Occupancy (temporary or final) shall be deemed a violation of this code section and no future permits shall be issued to any person or company who has outstanding violations of this code or any other laws or ordinances of the City.”
6. Amend Section R108.2, Schedule of Permit Fees, by adding the following language:
“Permit fees will be derived from the City fee schedule as adopted.”
7. Amend Section R108.3, Building Permit Valuations, by adding the following language:
“The building valuation will be derived from the construction costs for the total work submitted by the contractor, or the most current Building Valuation Data Schedule published by the International Code Council (ICC). Submitted contractor valuation shall not be less than derived valuation through ICC. Published data is utilized by the Administrative Official in an effort to maintain consistency and fairness for permit fee calculations. It is not intended to reflect actual taxable value.
The method for determining the value of the additional listed residential items will be as follows:
The square foot of the listed structure, times the dwelling – Type V – Wood Frame Value, times the percentage multiplier assigned to each item as list below:
1. Open Decks – 8 Percent
2. Screened Porches – 15 Percent
3. In-Ground Pools – 17 Percent
4. Above-Ground Pools – 8 Percent
5. Three-Season Porches – 50 Percent
6. Detached Garages – 50 Percent
7. Post Frame Buildings – 50 Percent
8. Remodel or Renovation – 30 Percent”
8. Amend Section R108.5, Refunds, to read as follows:
“Fee Refunds. The Administrative Official may authorize refunding of any fee paid hereunder which was erroneously paid or collected.
The Administrative Official may authorize refunding of not more than 80 percent of the permit fee paid when no work has been done under a permit issued in accordance with this code.
The Administrative Official may authorize refunding of not more than 80 percent of the plan review fee paid when an application for a permit for which a plan review fee has been paid is withdrawn or canceled before any plan reviewing is done.
The Administrative Official shall not authorize refunding of any fee paid except on written application filed by the original permittee not later than 180 days after the date of fee payment.”
9. Amend Section R110.1, Use and Change of Occupancy, to add the following language at the end of the paragraph:
“On all new construction, all necessary walks, drives, and approaches, and all seeding and sodding are to be installed before a final certificate of occupancy is issued.”
10. Amend Table R301.2, Climatic and Geographic Design Criteria, to read as follows:
Ground Snow Load | Wind Speed MPH | Seismic Design Category | Subject to Damage From: | Winter Design Temp | Ice Barrier Underlayment Required | Flood Hazards | Air Freezing Index | Mean Annual Temp | |||||
Speed (MPH) | Topographic Effects | Special Wind Region | Windborne Debris Zone | Weathering | Frost Line Depth | Termite | |||||||
30 | 115 | No | No | No | A | Severe | 42 | Moderate | 0 | Yes | Dec. 2007 | 2000 | 48.6 |
11. Amend Section R301.2.1.3, Wind Speed Conversion, to add the following:
“For purposes of determining wind loads, the minimum basic wind speed shall be considered as 115 miles per hour; except when referenced documents are based on fastest mile wind velocities, Table R301.2(1) shall be used.”
12. Amend Section R301.2.3, Snow Loads, to add the following:
“For purposes of determining snow loads, the minimum ground snow load for design purposes shall be 30 pounds per square foot. Subsequent increases or decreases shall be allowed as otherwise provided in this code, except that the minimum allowable flat roof snow load may be reduced to not less than 80 percent of the ground snow load.”
13. Amend Section R302.3, Two-Family Dwellings, to read:
“For purposes of fire-resistive separation, two-family dwelling units shall be considered as townhouses and shall be constructed in accordance with Section R302.2.”
14. Amend Table R302.6, Dwelling-Garage Separation, as follows:
TABLE R302.6 DWELLING-GARAGE SEPARATION | |
SEPARATION | MATERIAL |
From the residence and attics | Not less than 5/8-inch “X” gypsum board or equivalent applied to the garage side |
From habitable rooms above the garage and structure(s) supporting floor/ceiling assemblies used for separation required by this section | Not less than 5/8-inch “X” gypsum board or equivalent |
Garages located less than five feet from a dwelling unit on the same lot | Not less than 5/8-inch “X” gypsum board or equivalent applied to the interior side of exterior walls and ceiling within the garage |
For SI: 1 -inch = 25.4 mm, 1-foot = 304.8mm | |
15. Delete Section R302.13, Fire Protection of Floors.
16. Amend Section R305.1.1, Basements, Exception, to read as follows:
“Existing basements not having a height as specified in this section are allowed to be finished with a ceiling height that is not decreased more than the minimal measurement created by applying a finished ceiling of gypsum board or acoustical ceiling tiles.”
17. Amend Section R310.2.3, Maximum Height From Floor, to add the following exception:
“Exception. A landing may be provided to meet the maximum sill height of 44-inches above the floor or landing provided. The landing shall be not less than 36-inches wide, not less than 12-inches out from the exterior wall, and not more than 24-inches in height. The landing shall be permanently affixed to the floor below or the wall under the window it serves.”
18. Amend Section R310.6, Dwelling Additions, Exceptions to read as follows:
“Existing basements not having a height as specified in this section are allowed to be finished with a ceiling height that is not decreased more than the minimal measurement created by applying a finished ceiling of gypsum board or acoustical ceiling tiles.”
19. Amend Section R311.3.2, Floor Elevations At Other Exterior Doors, Exception to read as follows:
“Exception. A top landing is not required where a stairway of not more than four rises is located on the exterior side of a door, provided the door does not swing over the stairway.”
20. Amend Section R311.7.5.1, Risers, by adding Exception No. 3, to read as follows:
“Exception.
3. The dimension of the top and bottom riser of a stair may vary up to one-inch (25.4 mm) from the stairway riser dimension; however, in no case shall the riser height exceed seven and three-quarter inches.”
21. Amend Section R311.7.8.4, Continuity, by adding Exception No. 3, to read as follows:
“Exception.
3. Handrails within a dwelling unit or serving an individual dwelling unit shall be permitted to be interrupted at one location in a straight stair when the rail terminates into a wall or ledge and is offset and immediately continues.”
22. Delete Section R313.1, Townhouse Automatic Fire Sprinkler Systems, and replace with the following:
“R313.1 Townhouse Automatic Fire Sprinkler Systems.
An automatic residential fire sprinkler system shall be installed in townhouses.
Exceptions:
1. An automatic residential fire sprinkler system shall not be required where additions or alterations are made to existing townhouses that do not have an automatic residential fire sprinkler system installed.
2. Townhouse structures where the conditioned square footage of the entire building is less than 18,000 square feet. For purposes of this section, conditioned space shall be defined as space that can be occupied but shall not include garages or attics.
3. Townhouse structures that contain eight or less dwelling units.”
23. Delete Section R313.2, One- and Two-Family Dwellings Automatic Sprinkler Systems, and replace with the following:
“R313.2 One- and Two-Family Dwelling Automatic Sprinkler Systems.
An automatic residential fire sprinkler system shall be installed in one- and two-family dwellings.
Exceptions:
1. An automatic residential fire sprinkler system shall not be required where additions or alterations are made to existing buildings that are not already provided with an automatic residential fire sprinkler system.
2. One- and two-family dwellings containing less than 8,000 square feet of floor space, excluding attached garages and other unenclosed areas.”
24. Amend Section R317.1, Location Required, by adding the following Subsection No. 10:
“10. Fences. Residential fences shall be chain link, ornamental iron, PVC/composite, or approved wood. Wood used in fences shall be treated wood, or approved wood of natural resistance to decay.”
25. Delete Table R403.1(1) and replace with the following:
TABLE R403.1(1) FOUNDATIONS FOR STUD BEARING WALLS | |||||
Number of Stories | Thickness of Foundation Walls Unit Concrete Masonry | Minimum Width of Footing (inches) | Thickness of Footing (inches) | Minimum Depth of Foundation Below Natural Surface of Ground and Finish Grade (inches) | |
1 | 8 | 8 | 16 | 8 | 42 |
2 | 8 | 8 | 16 | 8 | 42 |
3 | 10 | 10 | 18 | 12 | 42 |
26. Delete Table R403.1(2) and Table R403.1(3).
27. Delete Section R403.1.4.1, Exception 1, Frost Protection, and replace with the following:
“Exception.
1. Accessory structures up to 200 square feet may be constructed on a four-inch wood deck or four-inch concrete slab. Protection for detached garages and other accessory structures 1,024 square feet or less in size, located more than 10 feet from a dwelling, attached garage, or other principal structures, may be accomplished with a floating slab (monolithic). The floating slab shall include a thickened slab edge or a minimum 18-inches thick. Twelve inches of the thickened slab shall be below grade and six inches shall be above finished grade. The bottom portion of the thickened slab area shall be 12 by 12 inches. Two #4 rebar shall be placed within the thickened edge continuous around the perimeter of the slab. The floor shall be Portland cement concrete not less than four-inches thick. Garage floor areas shall have all sod and/or debris removed. For detached garages and accessory structures exceeding 1,024 square feet, a frost protected footing and foundation shall be required.”
28. Delete Section R403.1.4.1, Exception 2, Frost Protection.
29. Amend Section 404.1, Concrete and Masonry Foundation Walls, by adding the following:
“Scope. Notwithstanding other design requirements of Sections R404.1 – R404.1.5.2 of the International Residential Code, foundation retaining walls for one- and two-family dwelling occupancies of Type V construction may be constructed in accordance with this section, provided that use or building site conditions affecting such walls are within the limitations specified in this section. Concrete foundation walls shall be selected and constructed in accordance with the provisions of Section R404.1.3. Masonry foundation walls shall be selected and constructed in accordance with the provisions of Section R404.1.2. If backfill prior to a poured in place floor slab is desire, one of the following methods to provide bottom lateral support shall be completed:
(1) A full depth (minimum 1-1/2”) nominal 2” x 4” keyway may be formed into the footings to secure the bottom of the foundation wall, or
(2) 36” long vertical #4 rebar may be embedded a minimum of 6” into the footings not to exceed 7’ on center spacing.”
30. Add Section IRC R404.1.3.2.3, Foundation Walls for Conventional Light Frame Construction, and the following Table R404.1.3.2.3 as follows:
TABLE R404.1.3.2.3 FOUNDATION WALLS FOR CONVENTIONAL LIGHT FRAME CONSTRUCTION | ||||||
Height of Foundation Wall (Net measured from top of basement slab o top of foundation wall)* | Thickness of Foundation Walls Unit | Reinforcement Type and Placement Within Foundation Wall** | Reinforcement Type and Placement Within Foundation Wall** (Maximum 12’ span between corners and supporting cross walls) | Type of Mortar | ||
Gross | Net | Concrete | Masonry | Concrete | Masonry | Masonry |
8 | 7' 8" | 7 1/2" | 8" | ½” horizontal bars, placement in the middle, and near the top and bottom – ½” bars at 6’ max. vertically | 0.075 square inch bar 8’ o.c. vertically in fully grouted cells. If block is 12” nominal thickness, may be unreinforced. | Type M or S. Grout and Mortar shall meet provisions of Chapter 21 IBC |
9 | 8'8" | 8" | See Chapter 18 IBC | ½” bars 2’ o.c. horizontally and 20” vertically o.c. | See Chapter 18 IBC | Same as above |
10 | 9'8" | 8" | See Chapter 18 IBC | (5/8” bars 2’ o.c. horizontally and 30” vertically o.c.) | See Chapter 18 IBC | Same as above |
*Concrete floor slab to be nominal four inches. If such floor slab is not provided prior to backfill, provide: 1. 36” vertical embedded in the footing at maximum seven-foot O.C. spacing; and/or, 2. Full depth nominal two-inch depth x four-inch width keyway in footing. | ||||||
**All reinforcement bars shall meet ASTM A6175 Grade 40 minimum and be deformed. Placement of bars shall center of wall and meet the provisions of Chapters 18, 19, and 21 of the International Building Code. | ||||||
NOTE: Cast in place concrete shall have a compressive strength of 3,000 lbs. at 28 days. Footings shall contain reinforcement of minimum 2 – Y2” diameter rebar throughout. Placement of reinforcement and concrete shall requirements of Chapter 19 of the International Building Code. | ||||||
NOTE: Material used for backfilling shall be carefully placed granular soil of average or high permeability and drained with an approved drainage system as prescribed in Section 1805.4 of the International Building Code. containing a high percentage of clay, fine silt, or similar materials of low permeability or expansive soils are where backfill materials are not drained, or an unusually high surcharge is to be placed adjacent to the wall, a designed wall shall be required. | ||||||
NOTE: Foundation plate or sill anchorage shall be installed in accordance with the respective codes as applicable. | ||||||
31. Delete Chapter 11, Energy Efficiency, and replace with the following:
“Provisions of the International Energy Conservation Code as currently adopted and amended by the Iowa State Building Code Bureau shall apply to all matters governing the design and construction of buildings for energy efficiency. Administration shall be prescribed in “this code” and the regulations shall be known as the Osceola Energy Code.”
32. Amend Section M1601.4, Installation, to read as follows:
“Duct installation shall comply with Sections M1601.4.1 through M1601.4.11.”
33. Add a new subsection to Section M1601.4, Installation, to read as follows:
“M1601.4.11 Air Plenum and Duct Separation.
Air plenums and ducts located in floor and wall cavities shall be separated from unconditioned spaces by construction with sufficient insulation to meet energy code requirements. These areas include but are not limited to exterior walls, cantilevered floors, and floors above garages.”
34. Delete Section G2415.5.2 (403.5.2), LP-Gas Systems, and replace with the following:
“G2414.5.2 (403.5.2) Corrugated Stainless Steel Tubing (CSST).
Only CSST with an Arc Resistant Jacket or Covering System listed in accordance with ANSI LC-1 (Optional Section 5.16)/CSA 6.26-2016 shall be installed in accordance with the terms of its approval, the conditions of listing, the manufactures instructions and this code including electrical bonding requirements in Section G2411. CSST shall not be used for through wall penetrations from the point of delivery of the gas supply o the inside of the structure. CSST shall not be used for through wall penetrations from the point of delivery of the gas supply to the inside of the structure. CSST shall not be installed in locations where subject to physical damage unless protected in an approved manner.”
35. Delete Section G2414.5.4 (403.5.5), XXXX, and replace with the following:
“G2414.5.4 (403.5.5) Corrugated Stainless Steel Tubing.
Arc resistant corrugated stainless-steel tubing shall be listed in accordance with ANSI LC 1 (Optional Section 5.16)/CSA 6.26.”
36. Amend Section P2603.5.1, Sewer Depth, to read as follows:
“Building sewers that connect to private sewage disposal systems shall not be less than 60 inches below finished grade at the point of septic tank connection or as approved by the County Environmental Health Department. Buidling sewers shall not be less than 60 inches below grade.”
37. Add Section E3704.7, Prohibited Locations, to read as follows:
“E3704.7 Prohibited Locations.
Feeders supplying a townhome shall not cross a property line other than the individual unit served. For the purposes of this provision, the term townhome shall mean a single-family dwelling unit constructed in a group of two or more attached units in which each unit extends from foundation in a group of two or more attached units in which each unit extends from foundation to roof and with a yard or public way on not less than two sides.
Exception: If a recorded easement is established in a concealed space or attic within the townhome unit, feeds are allowed within the easement.”