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Section R310.7 Alterations or Repairs of Existing Basements, of the IRC, is hereby amended by deleting said section and exception and inserting in lieu thereof the following:
Section R310.7 Alterations or Repairs of Existing Basements New habitable spaces created in an existing basement shall be provided with emergency escape and rescue openings in accordance with Section R310.1.
Section R311.3.2 Floor Elevations At Other Exterior Doors of the IRC is amended by deleting the exception and inserting in lieu thereof:
Section R311.3.2 exception A top landing is not required where a stairway of not more than four risers is located on the exterior side of a door, provided the door does not swing over the stairway.
Section R311.7.5.1, Riser height, of the IRC, is hereby amended by adding the following exceptions:
Section R311.7.5.1 Riser height exception 3 The dimension of the top and bottom riser of a stairway may vary up to 1-inch (25mm) from the stairway riser dimension; however, in no case shall the riser height exceed seven and three-quarter inches (196mm).
Section R311.7.5.1 Profile exception 4 The opening between adjacent treads is not limited on exterior stairs serving individual dwelling units.
Section R311.7.8.4, Continuity, of the IRC, is hereby amended by adding the following exception:
Section R311.7.8.4 Continuity 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.
Section R313.1 Townhouse automatic fire sprinkler system, of the IRC, is hereby amended by adding the following exceptions (existing exception 1 remains unchanged):
Section R313.1 Townhouse automatic fire sprinkler systems. Exceptions:
2. Townhouse structures that contain eight (8) or less dwelling units.
3. Townhouse structures less than eighteen thousand (18,000) square feet floor space, exclusive of any garages.
Section R313.2 One- and two-family automatic fire sprinkler systems, of the IRC, is hereby amended by adding the following exception (existing exception remains unchanged):
Section R313.2 One- and two-family automatic fire sprinkler systems exception 2 Dwelling units in which the gross square footage of the dwelling space(s), including all floor levels whether finished or unfinished and all basement areas whether finished or unfinished (exclusive of attached garage area), does not exceed 8,000 square feet.
Section R403.1.1, Minimum Size, of the IRC, is hereby amended by adding the following Table R403.1(4):
For purposes of sizing and construction of footings for residential conventionally light-framed construction with cast-in-place or fully grouted masonry foundation wall construction, constructed upon undisturbed, non-expansive soils, the following table and footnotes may be used in lieu of table R403.1(1), R403.1(2), R403.1(3):
Table R403.1(4)
Number Stories | Foundation Wall Thickness | Minimum Footing Thickness (inches) | Minimum Footing Width (inches) | Minimum Continuous Reinforcement (rebar) | |
Concrete | Masonry
| ||||
1 | 8 | 8 | 8 | 16 | 2 - #4 |
2 | 8 | 8 | 8 | 16 | 2 - #4 |
Demising Walls | 8 | 8 | 8 | 18 | 2 - #4 |
3 | 10 | 10 | 12 | 22 | 3 - #4 |
Demising Walls | 10 | 10 | 12 | 22 | 3- #4 |
a. assumed soil bearing capacity 2000 psf
b. foundations placed upon areas of poor bearing or expansive soils shall be engineered
c. footings carrying point loads shall be engineered
d. foundations may support a roof in addition to the stipulated number of floors
e. foundations supporting a roof only shall be as required for supporting one floor
f. reinforcing shall be evenly spaced with proper overlaps
g. perimeter footings shall be minimum 42” below surrounding grade within 5’ horizontally of foundation
Section R403.1.4.1, Frost Protection, of the IRC, is hereby amended by deleting all existing exceptions and inserting in lieu thereof the following exception:
Section R403.1.4.1 Frost protection exception Detached garages of light frame wood construction of 1,010 square feet or less in size and detached garages of 400 square feet or less in size of other than light frame wood construction and not located entirely within the buildable area of the lot may be provided with a floating slab. The floating slab shall include a thickened slab edge of a minimum twelve (12) inches thick. Six 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 twelve (12) by twelve (12) inches. Two #4 rebar shall be placed within the thickened edge continuous around the perimeter of the slab. Floors shall be of Portland cement concrete not less than 4 inches thick. Garages areas shall have all sod and/or debris removed prior to installation of said floor.
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