specifications show the nominal dimensions, arrangements and additional details, as well as modifications to and adaptations of manufacturer's parts or assemblies required by the work. ec. Materials shall be as below specified except where otherwise called for on the drawings. l. Extruded structural members shall be as 2. Bent detailed on manufacturer's approved drawings and shall be 638-T5 aluminum alloy. plate members shall be as detailed, and formed of 4383/3 H aluminum alloy of the following thicknesses: End columns Side columns O51 -O51 Rafters O40 Knee braces .O91 Ridge rafters Wall corrugation Roof corrugation -O51 .032 025 Corner sheet Gable sheet Gable cap 3. .032 .032 .O91 Rough. hardware, except sill anchors, and including bolts, nuts, screws, nails, splice plates, etc, shall be of aluminum alloys as called for on detail- ed drawings, and shall be of sizes shown. Bolt heads and nuts shall be provided with fiber or synthetic rubber washers. steel studs, 4. $411 anchors shall be explosive driven or steel anchor bolts and shall be treated for corrosion resistance. Explosive driven studs and guns therefor shall be "Drive-It" as manufactured by the Powder- Power Tool Corporation or approved equal. Size and type of studs and weight of explosive charges shall be as recommended by the manufacturer. Studs shall have a minimum penetration into concrete of 1-3/4 inches. 5. Wooden walers, uprights, and rails for double roofed buildings and blocking or other wood members used in erecting metal buildings shall be as specified in the "Carpentry and Related Work" section. 6. Finish hardware for aluminum swinging and 13-2