Table R302.1(1), Exterior Walls, of the IRC, is hereby amended by modifying said table as follows:
Exterior Wall Element | Minimum Fire-Resistance Rating | Minimum Fire Separation Distance | |
Walls | (Fire-resistance rated) | Dwellings - 1 hour - tested in accordance with ASTM E119, UL 263 or Section 703.3 of the International Building Code with exposure from both sides | < 5 feet |
(Fire-resistance rated) | Accessory Structures - 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) | Dwellings - 0 hours | ≥ 5 feet | |
(Not fire-resistance rated) | Accessory Structures - 0 hours | ≥ 3 feet | |
Projections | (Fire-resistance rated) | Dwellings - 1 hour on the underside, or heavy timber, or fire-retardant-treated wood | < 3 feet |
(Fire-resistance rated) | Accessory Structures - 1 hour on the underside, or heavy timber, or fire-retardant-treated wood<2 feet | <2 feet | |
(Not fire-resistance rated) | Dwellings - 0 hours | ≥ 3 feet | |
(Not fire-resistance rated) | Accessory Structures - 0 hours | ≥ 2 feet | |
Openings | Not allowed | N/A | < 3 feet |
25% Maximum Wall Area | 0 hours | ≥ 3 feet | |
Unlimited | 0 hours | ≥ 5 feet | |
Penetrations | All | Comply with Section R302.4 | < 3 feet |
None required | ≥ 3 feet | ||