651— Flat Sheet Signs

651.1 Description

1 Furnish, fabricate, and install flat sheet signs.

651.2 Materials

651.2.1 Sign Blanks

1 Fabricate sign blanks from aluminum that complies with ASTM B209, Alloys 6061- T6, 5052- H38, or 5154- H38. Comply with the following aluminum thickness requirements: Sign Width Blank Thickness Less than 48 in. 0.080 in. 48 or more in. 0.100 in. 2 Measure the width of signs along the horizontal edge. Measure the width of diamond shape and pennant shaped signs along the sloped edge of the sign.

651.2.2 Mounting Hardware

1 Use 5/16-in. stainless steel or galvanized steel bolts of the proper length with a nylon washer between the bolt head and sign face and a lock washer and flat washer between the support and the nut to attach the sign proper to the supports. Attach flat sheet signs to U-section posts, square tubing posts, I -beam breakaway posts, or other supports as indicated on the Plans and Standard Drawings . 2 When attaching signs to an overhead structure upright or a bridge column, use a mounting system consisting of two sign braces attached to the sign and held onto the column or upright with a stainless steel banding system. Use a minimum of two bands per si gn. Use a system with a bracket or screw type adjustment so that it can be removed from the upright or column if necessary without damage to the sign, braces , or bracket, or the upright or column.

651.2.3 Reflective Sheeting Materials

1 Use reflective sheeting that complies with ASTM D4956. 2 In addition to the requirements of ASTM D4956, ensure that reflective sheeting conforms to the following provisions :