The following amendments to the 2021 International Residential Code shall apply:
Chapter 1 Administration
The same amendments to Chapter 1 Administration of the 2021 International Building Code listed in Division 1 of this ordinance that pertain to text duplicated in this chapter do likewise apply.
In addition, the following non-duplicated text is amended as follows:
Section R105 Permits
R105.2 Work exempt from permit.
Building:
Delete “1. One-story detached structures, providing the floor area does not exceed 200 square feet.”
Chapter 2 Definitions
Townhouse
Delete definition for townhouse and insert the following:
“Townhouse. A single family dwelling unit constructed in a group of two (2) up to six (6) attached units in which each unit extends from foundation to roof and with open space on at least two sides. Dwelling units where more than six (6) units are attached shall be governed by the 2021 International Building Code.”
Insert the following new definition:
“Useable Space. Any space in or attached to a building including habitable spaces, living spaces, occupiable spaces and all other areas including storage spaces, utility spaces, mechanical spaces, unfinished basements, open porches, decks, and breezeways.”
Chapter 3 Building Planning
Section R301 Design Criteria
R301.2(1) Insert:
Ground Snow Load In Pounds Per Sq. Ft. | Wind | Seismic Design Categoryf,g | Subject To Damage From | Winter Design Tempf (F Deg) | |||
Wind Speed | Weatheringa | Frost Line Depth In Inchesb | Termitec | Decayd | |||
30 lbs/sf | 90 mph | B | Severe | 42" | Moderate - heavy | Slight - moderate | -5° |
Topo effect No | |||||||
Ice Shield | Flood Hazardh | Air Freezing Index | Mean Annual Temp. |
Yes | See local ordinanc e | 2000 | 48.5° |
R301.2.4 Floodplain Construction
Delete and insert the following:
“For buildings and structures in flood hazard areas as established on local floodway rate maps, locally adopted floodplain ordinances shall apply.”
Section R302 Fire Resistant Construction
Section R302.2 Townhouses
Delete Section R302.2 Townhouses and the corresponding exception and insert the following:
“R302.2 Townhouses
Each townhouse, as defined in this code, shall be constructed as a separate single-family dwelling and shall be separated by a minimum of a two (2) hour rated solid masonry wall between living units, which shall extend vertically from the foundation to the underside of the roof sheathing and horizontally the full length of the common wall. The number of single family dwelling units attached in this manner shall not exceed six (6).”
R302.2.6 Structural independence.
Delete Exceptions 2.and 5.
Delete Section R302.3 Two-family dwellings and the corresponding exception and sub-section.
Section R310 Emergency Escape and Rescue Openings
R310.1 Emergency escape and rescue required.
Delete the first sentence and insert the following:
“Basements and every sleeping room shall have at least one openable emergency escape and rescue opening.”
Section R313 Automatic Fire Sprinkler Systems
R313.1 Townhouse automatic fire sprinkler systems. Change "shall" to "may".
R313.2 One- and Two-family dwellings automatic fire systems. Change "shall" to "may".
Section R314 Smoke Alarms
R314.1 Smoke detection and notification.
R314.3 Location
Delete 2. and insert the following:
“2. Outside each separate sleeping area within 15 feet of every room used for sleeping purposes per 425 ILCS 60, Smoke Detector Act.”
Chapter 4 Foundations
Section 401 General
Delete Section R401.1 and insert the following:
“R401.1 The provisions of this chapter shall control the design and construction of the foundation and foundation spaces of all buildings. Wood foundations shall not be allowed.”
Section R402 Materials
Delete the following section and corresponding sub-sections:
Section R402.1 Wood foundations
Section R403 Footings
Delete Section R403.1.1 Minimum size and insert the following:
“R403.1.1 Minimum sizes for concrete and masonry footings shall be as set forth in Table R403.1 and Figure R403.1(1). The footing width, W, shall be based on the load bearing value of the soil in accordance with Table R401.4.1. Spread footings width shall be twice the width of the foundation wall and not less than 16 inches. Spread footing Thickness (depth) shall be equal to the width of the foundation wall and not less than 8 inches. Footing Projections, P, shall be ½ the width of the foundation wall, not less than 2 inches and shall not exceed the thickness of the footing. The minimum size for deck piers shall be 12 inches in diameter.”
Insert the following new sub-section:
“R403.1.4.2 Exterior footings and foundation systems for detached accessory structures and non-conditioned attached useable spaces.
1. Detached single story accessory structures shall be allowed to be supported on a turned down slab per R403.1.3.3. or on piers designed and sealed by an Illinois licensed architect or structural engineer.
2. Non-conditioned attached useable space easily capable of converting to conditioned space shall have continuous footings per R403.1.4.1.
a. Determination of whether a useable space is easily capable of converting to conditioned usable space shall be per the Building Officials. If any of the following are provided, the non-conditioned useable space may be construed as easily capable of converting to conditioned useable space.
i) Exterior insulated walls
ii) Insulated roofs
iii) Permanently installed weatherproof windows and/or doors
iv) Electrical fixtures or outlets consistent with habitable space or living space
v) Heating or air conditioning appliances or provisions for same
vi) Plumbing fixtures or provisions for same
3. Non-conditioned attached usable space not easily capable of converting to conditioned useable space may be supported on pier foundation systems that extend to frost depth.
a. Non-conditioned structures built on pier systems shall not be converted to attached conditioned useable space without addressing the lack of a continuous footing to the satisfaction of the Building Official.
Delete the following section and corresponding sub-sections:
Section R403.2 Footings for wood foundations
Section R404 Foundation Walls
Delete the following section and corresponding sub-sections:
Section R404.2 Wood foundations walls
Section R405 Foundation Drainage
Delete the following section and corresponding sub-sections:
Section 405.2 Wood foundation drainage
Section R408 Under-Floor Space
Delete Section R408.4 Access and insert the following:
“R408.4 Access. Access shall be provided to all under-floor spaces. Access openings through the floor shall be a minimum 24 inches by 30 inches. Openings through a perimeter wall shall be a minimum of 24 inches by 30 inches. When any portion of the through wall access is below grade, an areaway of not less than 24 inches by 30 inches shall be provided. The bottom of the areaway shall be below the threshold of the access opening. Through wall access openings shall not be located under a door. See M1408.4 for access requirements where mechanical equipment is located under floors."
Delete Sections R408.5 and R408.6 and insert the following:
“R408.5 Finished grade. Exposed soil shall not be allowed. Four (4) inches of clean granular stone fill or two (2) inches of concrete shall be required over an approved continuous membrane of 6-mil polyethylene or equivalent material. Any joints will be lapped six (6) inches minimum and sealed with an approved material. The distance between the top of the granular fill or concrete, to the bottom of the floor joist above will be a minimum of 24 inches and a maximum 48 inches.”
Delete Section R408.7 Flood resistance and insert the following:
“R408.6 Flood resistance. Flood resistance construction shall meet the requirements of applicable state and local ordinances.”
Chapter 5 Floors
Delete Section R502.7.1 Bridging and insert the following:
"R502.7.1 Bridging. Joists shall be supported laterally by solid blocking, diagonal bridging (wood or metal) at intervals not exceeding eight (8) feet. The Building Official may approve alternate methods of bridging."
Section R504 Pressure Preservative Treated-wood Floors (on ground)
Delete the above section and corresponding sub-sections.
Section R506 Concrete Floors (on ground)
Insert the following new sub-section:
“R506.2.1.1 Back-fill under concrete floors in attached garages.
The sub-base for poured concrete garage floors shall be undisturbed inorganic soil.
a. Fill materials brought from off site shall be clean, graded sand, crushed stone or gravel.
b. When site soil is used as fill, it shall be appropriately compacted. The slab shall be doweled into the foundation wall as follows. Dowels (#4) shall be 3'-4" long, shall be doweled into foundation wall a minimum of 4", and shall be spaced at 24" on center; on all walls that do not provide 4" of bearing for slab.”
Part VII Plumbing
Delete the following chapters:
Chapter 25 Plumbing Administration
Chapter 26 General Plumbing Requirements
Chapter 27 Plumbing Fixtures
Chapter 28 Water heaters
Chapter 29 Water Supply and Distribution
Chapter 30 Sanitary Drainage
Chapter 31 Vents
Chapter 32 Traps
Insert the following text:
“The design and installation of all plumbing shall be in accordance to the Illinois Plumbing Code and all other applicable federal, state and local ordinances.” (Ord. 12-366, 12-11-2012, eff. 1-1-2013; amd. Ord. 21-475, 11-9-2021)