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Exterior wall finishes for permanent above-grade buildings or <br /> structures shall comply with one or more of the following <br /> selection of materials : <br /> a . Stucco/stucco brick <br /> b . Rubbed concrete <br /> C . Brick, over masonry or sturdy wood frame <br /> d . Stone aggregate on masonry <br /> e . Stone <br /> f. Asbestos-cement on masonry substrate <br /> 7 . Metal Fabrications <br /> Steel or other ferrous materials shall conform to the following : <br /> a . Structural shapes and plates — ASTM A-36 <br /> b . Pipe — ASTM A-53 <br /> c . Bolts , machine — ASTM A-307 <br /> d . Bolts , high tensile — ASTM A-325 <br /> e . Galvanizing — ASTM A- 123 or A- 153 , as applicable <br /> f. Iron castings — ASTM A-48 , Class 25 <br /> g . Abrasive cast iron (nosings ) — American Abrasive <br /> Metals Co . " Feralun , " or approved equal . <br /> h . Cast steel — ASTM A-27 , Grade N2 <br /> i . Stainless steel — Type 304 , unless otherwise required <br /> or specified <br /> j . Fabrication and erection — AISC Manual of Steel <br /> Construction . <br /> Aluminum materials shall conform to the following : <br /> a . Rolled shapes , smooth or checkered plates and <br /> extruded pipe — ALCOA 6061 -T6 or approved equal <br /> b . Other extruded shapes — ALCOA 6063-T5 or <br /> approved equal <br /> C, Sheets -- ALCOA 3003 or approved equal <br /> d . Pipe hand railing — ASTM B429 <br /> 8 . Windows <br /> Natural light is preferred for all buildings , and use of common <br /> sizes , spaced for adequate natural lighting of interiors is <br /> encouraged . <br /> Windows and frames shall conform to quality standards ANSI <br /> A-34 and AAMS 30 for high performance series . <br /> Frames shall be basic aluminum 6063-T5 with fasteners of <br /> aluminum or stainless steel . <br /> Plate glass shall be a minimum thickness of 7/32" and set in <br /> vinyl glazing material . <br /> 13-8 <br />