(A) Section R101.1 Title is amended to read as follows:
These provisions shall be known as the Residential Code for One- and Two-family dwellings of the City of Marshalltown, and shall be cited as such and will be referred to herein as "this code".
(B) Section R105.2 Work exempt from permit is amended to read as follows:
Exemptions from permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws or ordinances of this jurisdiction. Permits shall not be required for the following:
Building:
(1) One-story detached accessory structures provided that the floor area does not exceed 120 square feet; however, site plan approval shall be obtained from the zoning department.
(2) Fences not over 6 feet (1829 mm) tall.
(3) Painting, papering, tiling, carpeting, cabinets, countertops, and similar finish work.
(4) Sidewalks shall be permitted and installed in accordance with approved site plans for individual lot development.
(5) Swings and other playground equipment.
(6) 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, and are not attached to a dwelling and do not serve the exit door required by Section R311.4.
(C) Section R105.6.1 Revocation of Permit is added to read as follows:
It shall be 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 City ordinance 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 followup prior to expiration of a Temporary Certificate of Occupancy shall also be deemed a violation of this code. 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.
(D) Section R108.2 Schedule of permit fees is amended to read as follows:
Where a permit is required, a fee for each permit shall be paid as required, in accordance with the City of Marshalltown Fee Schedule as adopted.
(E) Section R108.3 Building permit valuations is amended to read as follows:
The applicant for a permit shall provide an estimated permit value at time of application. 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 multiplier assigned to each listed item.
(1) Open decks - 8%
(2) Above-ground pools - 8%
(3) Screened porches - 15%
(4) In-ground pools - 17%
(5) 3 season porches - 50%
(6) Detached garages - 50%
(7) Remodel/Renovation - 30%
(8) Post frame buildings - 50%
(F) Section R108.5 Fee refunds is amended to read as follows:
The administrative official may authorize refunding of any fee hereunder which was erroneously paid or collected.
The administrative official may authorize refunding of not more than 80 percent of the plan review 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 except on written application filed by the original permittee not later than 180 days after the date of fee payment.
(G) Section R110.1 Use and change of occupancy is amended to read as follows:
A building or structure shall not be used or occupied in whole or in part, and a change of occupancy of a building or structure or portion thereof shall not be made until the building official has issued a certificate of occupancy therefor as provided herein. Issuance of a certificate of occupancy shall not be construed as an approval of a violation of the provisions of this code or of other ordinances of the jurisdiction. Certificates presuming to give authority to violate or cancel the provisions of this code or other ordinances of the jurisdiction shall not be valid. 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.
Exceptions:
(1) Certificates of occupancy are not required for work exempt from permits under Section R105.2.
(2) Accessory buildings or structures.
(H) Table R301.2 Climatic and geographic design criteria is amended to read as follows:
Ground Snow Load | Wind Design | Seismic Design Category | Subject to Damage From | Winter Design Temp | Ice Barrier Underlayment Required | Flood Hazards | Air Freezing Index | Mean Annual Temp | |||||
30 | Speed MPH | Topographic Effects | Special Wind Region | Wind-borne Debris Zone | A | Weathering | Frost Depth | Termite | 0 | Yes | Dec. 2007 | 2,0 00 | 48. 6 |
115 | No | No | No | Severe | 42 | Moderate | |||||||
(I) Section R301.2.1.3 Wind speed conversion is amended to read as follows:
Where referenced documents are based on nominal design wind speeds and do not provide the means for conversion between ultimate design wind speeds and nominal design wind speeds, the ultimate design wind speeds, Vu1t, of Figure R301.1(2) shall be converted to nominal design wind speeds, Vasd, using Table R301.2.1.3. 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.
(J) Section R301.2.3 Snow loads is amended to read as follows:
Wood-framed construction, cold-formed, steel-framed construction and masonry and concrete construction, and structural insulated panel construction in regions with ground snow loads 70 pounds per square foot (3.35 kPa) or less, shall be in accordance with Chapters 5, 6, and 8. Buildings in regions ground snow loads greater than 70 pounds per square foot (3.35 kPa) shall be designed in accordance with accepted engineering practice.
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.
(K) Section R302.3 Two-family dwellings is amended to read as follows:
For the purposes of fire-resistive separation, two-family dwelling units shall be considered as townhouses and shall be constructed in accordance with Section R302.
(L) Table R302.6 Dwelling-Garage separation is amended to read as follows:
Table R302.6 Dwelling – Garage Separation | |
Separation | Material |
From the residence and attics | Not less than 5/8" gypsum board or equivalent applied to 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" gypsum board or equivalent |
Garages located less than 5 feet from a dwelling unit on the same lot | Not less than 5/8" gypsum board or equivalent applied to the interior side of exterior walls and ceilings within the garage |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm | |
(M) Section 302.13 Fire protection of floors is deleted.
(N) Section R305.1.1 Basements is amended to read as follows:
Portions of basements that do not contain habitable space or hallways shall have a ceiling height of not less than 6 feet 8 inches (2032 mm).
Exception:
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.
(O) Section R310.2.3 Maximum height from floor is amended to read as follows:
Emergency escape and rescue openings shall have the bottom of the clear opening not greater than 44 inches (1118 mm) above the floor.
Exception:
A landing may be provided to meet the maximum sill height of 44 inches above the floor or landing provided. The landing shall not be 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.
(P) Section R310.6 Dwelling additions is amended to read as follows:
Where dwelling additions contain sleeping rooms, an emergency escape and rescue opening shall be provided in each new sleeping room. Where dwelling additions have basements, an emergency escape and rescue opening shall be provided in the new basement.
Exception:
New habitable spaces created in an existing basement shall be provided with emergency escape and rescue openings in accordance with Section R310.1.
(Q) Section R311.3.2 Floor elevations at other exterior doors is amended to read as follows:
Doors other than the required egress door shall be provided with landings or floors not more than 7 3/4 inches (196 mm) below the top of the threshold.
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.
(R) Section 311.7.5.1 Risers is amended to read as follows:
The riser height shall not be more than 7 3/4 inches (196 mm). The riser height shall be measured vertically between the leading edges of the adjacent treads. The greatest riser height within any flight of stairs shall not exceed the smallest by more than 3/8 inch (9.5 mm). Risers shall be vertical or sloped from the underside of the nosing of the tread above at an angle not more than 30 degrees (0.51 rad) from the vertical. At open risers, openings located more than 30 inches (762 mm), as measured vertically, to the floor or grade below shall not permit the passage of a 4-inch-diameter (102 mm) sphere.
Exceptions:
(1) The opening between adjacent treads is not limited on spiral stairways.
(2) The riser height of spiral stairways shall be in accordance with Section R311.7.10.1.
(3) The dimensions of the top and bottom riser of a stair may vary up to 1 inch (25.4 mm) from the stairway riser dimension; however, in no case shall the riser height exceed 7 3/4 inches (196 mm).
(S) Section R311.7.8.4 Continuity is amended to read as follows:
Handrails shall be continuous for the full length of the flight, from a point directly above the top riser of the flight to a point directly above the lowest riser of the flight. Handrail ends shall be returned toward a wall, guard walking surface continuous to itself, or terminates to a post.
Exceptions:
(1) Handrail continuity shall be permitted to be interrupted by a newel post at a turn in a flight with winders, at a landing, or over the lowest tread.
(2) A volute, turnout, or starting easing shall be allowed to terminate over the lowest tread and over the top landing.
(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.
(T) Section R313.1 Townhouse automatic fire sprinkler systems is amended to read as follows:
An automatic fire 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 (8) or less dwelling units.
(U) Section R313.2 One and two-family dwelling automatic fire sprinkler systems is amended to read as follows:
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 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.
(V) Section R317.1 Location required is amended to read as follows:
Protection of wood and wood-based products from decay shall be provided in the following locations by the use of naturally durable wood or wood that is preservative treated in accordance with AWPA U1.
(1) In crawl spaces or unexcavated areas located within the periphery of the building foundation, wood joists or the bottom of a wood structural floor were closer than 18 inches (457 mm) to exposed ground, wood girders were closer than 12 inches (305 mm) to exposed ground, and wood columns where closer than 8 inches (204 mm) to exposed ground.
(2) Wood framing members, including columns, that are in directly on concrete or masonry exterior foundation walls and are less than 8 inches (203 mm) from the exposed ground.
(3) Sills and sleepers on a concrete or masonry slab that is in direct contact with the ground unless separated from such slab by an impervious moisture barrier.
(4) The ends of wood girders entering exterior masonry or concrete walls having clearances of less than 1/2 inch (12.7 mm) on tops, sides, and ends.
(5) Wood siding, sheathing, and wall framing on the exterior of a building having a clearance of less than 6 inches (152 mm) from the ground or less than 2 inches (51 mm) measured vertically from concrete steps, porch slabs, patio slabs, and similar horizontal surfaces exposed to the weather.
(6) Wood furring strips or other wood framing members attached directly to the interior of exterior masonry walls or concrete walls below grade except where an approved vapor retarder is applied between the wall and the furring strips or framing members.
(7) Wood structural members supporting moisture-permeable floors or roofs that are exposed to the weather, such as concrete or masonry slabs, unless separated from such floors or roofs by an impervious moisture barrier.
(8) 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.
(9) Wood columns in contact with basement floor slabs unless supported by concrete piers or metal pedestals projecting not less than 1 inch (25 mm) above the concrete floor and separated from the concrete pier by an impervious moisture barrier.
(W) Table R403.l (1), (2), (3) are replaced with the following:
Table R403.1 – 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 |
(X) Section R403.1.4.1 Frost protection is amended to read as follows:
Except where otherwise protected from frost, foundation walls, piers and other permanent supports of buildings and structures shall be protected from frost by one or more of the following methods:
(1) Extended below the frost line specified in Table R301.
(2) Constructed in accordance with Section R403.3.
(3) Constructed in accordance with ASCE 32.
(4) Erected on solid rock.
Footings shall not bear on frozen soil unless the frozen condition is permanent.
Exception:
(1) Accessory structures up to 200 square feet may be constructed on a 4-inch wood deck or 4-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 principle structures, may be accomplished with a floating slab (monolithic). The floating slab shall include a thickened slab edge or a minimum of 18 inches thick. 12 inches of the thickened slab shall be below grade and 6 inches shall be above finished grade. The bottom portion of the thickened slab area shall be 12 by twelve 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 4 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.
(Y) Section R404.1 Concrete and masonry foundation walls are amended to read as follows:
Scope: Notwithstanding other design requirements of Sections R404.1 - R404.1.5.2 of the IRC, foundation retaining walls for one and two-family dwelling occupancies of Type V construction may be constructed in accordance with this section, provided that the 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.l.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 desired, one of the following methods to provide bottom lateral support shall be completed:
(1) A full depth (minimum 1 1/2") nominal 2-inch x 4-inch keyway may be formed into the footings to secure the bottom of the foundation wall, or
(2) 36-inch long vertical #4 rebar may be embedded a minimum of 6 inches into the footings not to exceed 7 inches on center spacing.
(Z) Section/Table R404.1.3.2.3 Foundation walls for conventional light-frame construction are added:
Height of foundation wall (net measured from top of basement slab to 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 | Type of mortar | ||
Gross | Net | Concrete | Masonry | Concrete | Masonry | Masonry |
Height of foundation wall (net measured from top of basement slab to 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 | Type of mortar | ||
Gross | Net | Concrete | Masonry | Concrete | Masonry | Masonry |
8 | 7'8" | 7 1/2" | 8" | 1/2" horizontal bars, placement in the middle, and near the top and bottom - Y2" 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 | 1/2" 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 slabs to be nominal 4". If such floor slab is not provided prior to backfill, provide 1.) 36" embedded in the footing at maximum 7' o.c. spacing and/or; 2.) Full depth nominal 2" depth x 4" width keyway in footing. • AU reinforcement bars shall meet ASTM A6175 grade 40 minimum and deformed. Placement of the center of wall and meet the provisions of Chapters 18, 19, and 20 of the IBC. | ||||||
NOTE: Cast in place concrete shall have a compressive strength of 3,000 lbs. at 30 days. Footings shall reinforcement of minimum of 2 - 1/2" diameter rebar throughout. Placement of reinforcement and requirements of Chapter 19 of the IBC. | ||||||
NOTE: Material used for backfilling shall be carefully placed granular soil of average or high drained with approved drainage system as prescribed in Section 1805.4 of the IBC containing a high percentage of clay, fine silt, or similar materials of low permeability or expansive soils where backfilled materials are not drained or an unusually high surcharge is to be placed adjacent to the designed wall shall be required. | ||||||
NOTE: Foundation plate of sill anchorage shall be installed in accordance with the respective codes as applicable. | ||||||
(AA) Chapter 11 Energy efficiency is amended by deleting this chapter and inserting the following language:
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 Marshalltown Energy Code.
(BB) Section R1601.4 Installation is amended to read as follows:
Duct installation shall comply with Sections M1601.4.1 through M1601.4.11
(CC) Section M1601.4.11 Air plenum and duct separation is added to read as follows:
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.
(DD) Section R G2415.5.2 (403.5.2) LP-gas systems are amended to read as follows:
Corrugated stainless steel tubing (CSST). Only CSST with an arc-resistant jacket or covering system listed in accordance with ANSI LC-1 (optional Section 5.15)/CSA 6.26 - 2016 shall be installed in accordance with the terms of its approval, the conditions of listing, the manufacturer's instructions, and this code including electrical bonding requirements in Section G2411. CCST shall not be used for through wall penetrations from the point of delivery of the gas supply to the inside of the structure. CCST shall not be installed in locations where subject to physical damage unless protected in an approved manner.
(EE) Section G2414.5.4 (403.5.5) Corrugated stainless steel tubing is added to read as follows:
Arc-resistant corrugated stainless steel tubing shall be listed in accordance with ANSI LC 1 (optional Section 5.16)/CSA 6.26.
(FF) Section P2603.5.1 Sewer depth is amended to read as follows:
Building sewers that connect to private sewage disposal systems shall not be less than 60 inches below the finished grade at the point of septic tank connection or as approved by Marshall County Environmental Health. Building sewers shall not be less than 60 inches below grade.
(GG) Section R E3704.7 Prohibited locations are added to read as follows:
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 the foundation to the 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.
(Ord. 15071, passed 9-25-2023)