Minnesota Administrative Rules

1309.0302 SECTION R302, EXTERIOR WALL LOCATION.

IRC Section R302.1 is amended to read as follows:

R302.1 Exterior walls. Construction, projections, openings, and penetrations of exterior walls of dwellings and accessory buildings shall comply with Table 302.1. These provisions shall not apply to walls, projections, openings, or penetrations in walls that are perpendicular to the line used to determine the fire separation distance. Projections beyond the exterior shall not extend more than 12 inches (305 mm) into areas where openings are prohibited.

Exceptions:

1. Detached garages accessory to a dwelling located within 2 feet (610 mm) of a lot line are permitted to have eave projections not exceeding 4 inches (103 mm).

2. Foundation vents installed in compliance with this code are permitted.

TABLE R302.1

EXTERIOR WALLS

	EXTERIOR WALL ELEMENT	MINIMUM FIRE-RESISTANCE RATING	MINIMUM FIRE SEPARATION DISTANCE
Walls
	(Fire-resistance rated)	1 hour with exposure from both sides	0 feet
	(Not fire-resistance rated)	0 hours	5 feet
Projections
	(Fire-resistance rated)	1 hour on the undersidea	4 feet
	(Not fire-resistance rated)	0 hours	5 feet
Openings
	Not allowed	N/A	<3 feet
	25 % Maximum of Wall Area	0 hours	3 feet
	Unlimited	0 hours	5 feet
Penetrations
	All	Comply with Section R317.3	<5 feet
		None required	5 feet

N/A= Not Applicable

^a 1 hour on the underside equates to one layer of 5/8" type X gypsum sheathing. Openings are not allowed.

Statutory Authority:

MS s 16B.59; 16B.61; 16B.64; 326B.101; 326B.106; 326B.13

History:

32 SR 12; L 2007 c 140 art 4 s 61; art 13 s 4

Published Electronically:

February 23, 2009