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3-2x12Look to engineering for all footing,foundation and tall wall framing.Under Stair ProtectionEnclosed space under stairs thatis accessed by a door or accesspanel shall have walls,under-stair surface and anysoffits protected on the enclosedside with 1/2" gypsum boardUnprotected portions of floor shall notexceed 80 Sq Ft.Provide fire blockingvertically at ceilings andfloors, and horizontally atintervals not exceeding 10'.