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c . . Truss Plate Institute Specifications <br /> Finish carpentry or millwork shall be of "B " or better yard <br /> grade seasoned lumber, conforming to applicable <br /> requirements of the Architectural Woodwork Institute . <br /> Shelving , cabinet doors , tops and ends shall be a minimum of <br /> Y4itplywood with all exposed edges trimmed with hardwood . <br /> Joints shall be tight and formed to conceal shrinkage . <br /> 12 . Roofing <br /> Moisture controls methods and materials for roofing shall be <br /> similar to Johns-Manville or Bird Specifications or approved <br /> equal for built-up and shingle roofs . <br /> Flat roofs shall have a minimum slope of 1 / 16" per foot, with <br /> 5-ply built-up roofing meeting the requirements for a 20-year <br /> bond . All built-up roofs on concrete slabs or metal decking <br /> shall be applied to 1 " rigid insulation board . <br /> Pitched shingle roofs shall have a minimum pitch of 3 %" <br /> vertical to 12° horizontal , with seal-down type asphalt or <br /> fiberglass shingles at 300 Ib . per square on two (2 ) layers of <br /> 15 lb . underlayment, meeting requirements for a minimum of <br /> 15 years' warranty. <br /> Fascia , gravel stops and soffits shall be of low maintenance <br /> materials , architectural metal or masonry preferred . <br /> Flashing and trim shall be either galvanized steel , 24 gage <br /> minimum thickness , conforming to Fed . Spec. QQ-S775 , <br /> Type I , Class C ; or aluminum 0 . 019" minimum thickness . <br /> Gutters and downspouts shall be provided on all permanent <br /> buildings . Screen protection from debris and concrete splash <br /> blocks are required for all downspouts . Materials shall be as <br /> follows : <br /> a . Gutters — 24 gage galvanized steel or 0 . 032" <br /> anodized aluminum <br /> b . Downspouts — 26 gage galvanized steel or 0 . 025" <br /> anodized aluminum <br /> C, Hanger straps — same material as gutters , as 3' -0" on <br /> centers , with blocking behind downspouts <br /> 13 . Specialties and Accessories <br /> Stairs shall be of reinforced concrete or all -welded structural <br /> aluminum . Nosing and treads shall be non-skid . Tread <br /> widths and riser heights shall conform to applicable codes <br /> 13- 10 <br />