UFC 3-120-01
FEBRUARY 6 2003
12.11.1.3. Welded joints shall be heliarc welded in conformance with the American Welding
Society and the Architectural Aluminum Association's specifications.
12.11.2. Steel. Square steel signposts shall conform to ASTM-A500 or A501. All other structural
steel shall conform to ASTM-A36. Steel sheeting shall conform to Federal Specification QQ-S-
77C, Class D.
12.11.2.1. All steel shall be galvanized after fabrication in accordance with ASTM-A123.
12.11.2.2. Prior to application of baked enamel finish, surface shall be cleaned and primed
according to the specifications of the manufacturer and the Steel Structure Painting Council.
Solvent cleaning followed by a wash coat of basic zinc chromate-vinyl butyral and a prime
coat of enamel primer is recommended in conformance with Federal Specification TTP- 636.
12.11.2.3. Prior to application of reflective sheeting, surface shall be cleaned and treated
according to manufacturer's specifications.
12.11.3. Wood Posts. All wood for posts shall be No. 1 Structural Grade Larch, fir, hemlock,
lodge pole pine or western cedar, in accordance with the Standard Grading Rules for Western
Lumber published by the Western Wood Products Association, Portland, Oregon. No. 1
Structural Grade (Stress Rated) southern pine, pitch pine, Virginia pine and ponderosa pine are
also acceptable. All woods shall be pressure treated with chromated copper arsenate at the
factory. Prior to application of enamel finish, surfaces shall be cleaned and primed according to
manufacturer's specifications.
12.11.4. Plastic, Cast Acrylic Duralite or Polycarbonate Sheets. Provide ultraviolet-light-
resistant, surface treated opaque sheets in sizes and thicknesses indicated with the minimum
flexural strength as recommended and tested for each material in accordance with ASTM D 790.
12.11.5. Fiberglass Backing Panels. Provide molded seamless thermosetting glass fiber
reinforced polyester panels in sizes and thicknesses indicated, with a minimum tensile strength
of 103 Mpa (15,000 psi) when tested in accordance with ASTM D 638 and a minimum flexural
strength of 207 Mpa (30,000 psi) when tested in accordance with ASTM D 790.
12.11.6. Metal Fasteners.
12.11.6.1. Mounting hardware for aluminum signs shall be hardened aluminum ASTM-B211
6061-T6 alloy.
12.11.6.2. Mounting hardware for steel signs shall be galvanized steel in accordance with
ASTM-A307 and ASTM-A153.
12.11.7. Magnetic Sheeting. Flexible magnetic sheeting for changeable letter signs shall be of
best commercial quality available and shall have a minimum thickness of .030 inches.
12.12. Foundations. Concrete foundations shall withstand all wind, water, ice and similar forces.
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