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
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)