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See Engineering <br />Enclosed space under <br />stairs shall have walls <br />and under-stair surface <br />enclosed with 1/2" <br />gypsum board Per <br />MNRC R302.7 <br />Provide fire blocking vertically at ceilings <br />and floors, and horizontally at intervals <br />not exceeding 10'. <br />Unprotected portions of floor shall not <br />exceed 80 Sq Ft.