Ordinance Text
9-1B-35: IRC ONE-AND-TWO-FAMILY DWELLING BUILDING CODE AMENDMENT, TABLE R302.1(1), EXTERIOR WALLS:
Table R302.1(1) shall be amended as follows:
TABLE R302.1(1)
EXTERIOR WALLS
Exterior Wall Element | Minimum Fire- Resistance Rating | Minimum Fire Separation Distance | |
Exterior Wall Element | Minimum Fire- Resistance Rating | Minimum Fire Separation Distance | |
Walls | Fire- resistance rated | 1 hour-tested in accordance with ASTM E119, UL 263, or Section 703.3 of the International Building Code with exposure from both sides | <3 feet |
Not fire- resistance rated | 0 hours | 3 feet | |
Projections | Fire- resistance rated | 1 hour on the underside, or heavy timber, or fire retardant-treated wooda,b | 2 feet to <3 feet |
Not fire- resistance rated | 0 hours | 3 feet | |
Openings in walls | Not allowed | N/A | <3 feet |
25% maximum of wall area | 0 hours | 3 feet to <5 feet | |
Unlimited | 0 hours | 5 feet | |
Penetrations | All | Comply with Section R302.4 | <3 feet |
None required | 3 feet | ||
For SI: 1 foot = 304.8 mm.
N/A = Not Applicable.
a. The fire-resistance rating shall be permitted to be reduced to zero (0) hours on the underside of the eave overhang if fireblocking is provided from the wall top plate to the underside of the roof sheathing.
b. The fire-resistance rating shall be permitted to be reduced to zero (0) hours on the underside of the rake overhang where gable vent openings are not installed.
(Ord. 44-17, 12-19-2017, eff. 1-1-2018; amd. Ord. 40-20, 12-1-2020, eff. 1-1-2021)
Source: American Legal Publishing — codelibrary.amlegal.com — public domain
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Boise, Idaho — United States
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Boise
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Ada County
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9-1B-30: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-31: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-32: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-33: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-34: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-35: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-36: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-37: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-38: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-39: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-40: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-41: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-42: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-43: IRC ONE-AND-TWO-FAMILY DWELLING BUIL9-1B-44: IRC ONE-AND-TWO-FAMILY DWELLING BUIL
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