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Enclosed space under stairs that is accessed by a door or access panel shall have walls, under-stair surface and any soffits protected on the enclosed side with 1/2-inch (12.7 mm) gypsum board.

Related Code Sections

R302.7 Building Planning, Under-Stair Protection
Enclosed space under stairs that is accessed by a door or access panel shall have walls, under-stair surface and any soffits protected ...
1011.7.3 Means of Egress, Enclosures Under Interior Stairways
The walls and soffits within enclosed usable spaces under enclosed and unenclosed stairways shall be protected by 1-hour fire-resistance- rated ...
1011.7.3 Means of Egress, Enclosures Under Interior Stairways
The walls and soffits within enclosed usable spaces under enclosed and unenclosed stairways shall be protected by 1-hour fire-resistance-rated ...