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See Engineering <br />Under Stair Protection <br />Enclosed space under stairs that <br />is accessed by a door or access <br />panel shall have walls, <br />under-stair surface and any <br />soffits protected on the enclosed <br />side with 1/2" gypsum board <br />Unprotected portions of floor shall not <br />exceed 80 Sq Ft. <br />Mechanical Ventilation <br />Required in all water closets <br />Fireblocking <br />Provide at penetrations, soffits, furred <br />spaces, and concealed interconnections <br />vertically at ceiling and floor levels, and <br />horizontally not exceeding 10' IRC R302.11