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sign faces but not as a.supporting means. If metal is used in the construction <br />of illuminated sign faces on box type signs or letters, it shall be not less <br />than No. 24 U.S. gauge (.025 inch). Metal used in faces of signs other than <br />box type shall be not less than No. 18 U.S. gauge (.050 inch). Metal shall be <br />used.for construction of backs of flat signs and shall be not less than No. 24 <br />U.S, gauge (.025 inch). Metal shall be used in the construction of box or <br />drum, i.e., that section to which the sign faces are attached, and shall be not <br />less than No. 20 U.S. sheet metal gauge (.037 inch). Box or drum shall be <br />galvanized steel and drainage shall be provided by means of one or more holes, <br />each not larger than one inch or less than one - quarter inch in diameter. <br />(E). REINFORCEMENT OF FACES. Metal faces of all illuminated signs more than two <br />feet wide shall be reinforced on the inside with galvanized iron stiffening <br />channels or angles and also stayed or braced to the frame or opposite side, such <br />stays or braces to be so placed that all surface areas of ten square feet are so <br />reinforced. <br />(F) FRAMEWORK. All signs having an area of twelve or more square feet of one <br />face shall have an approved structural framework of galavanized steel angles or <br />the equivalent in strength to be not less than specified in the following tables; <br />AREA OF FACE <br />12 to 20 sq. ft. <br />21 to 40 sq. ft. <br />41 to 70 sq. ft. <br />Larger than above <br />PROJECTING SIGNS <br />12 x 12 x 3/16 <br />2x2x3/16 <br />2x2x1/4 <br />2z x 22 x 1/4 <br />SINGLE FACED SMOS <br />12 x 1- x 3/16 <br />12x2x3/16 <br />2x2x3/16 <br />2x2x1/4 <br />(G) INTERMEDIATE BRACES. Signs of ten (10) or more lineal feet shall have an <br />intermediate brace for every five (5) lineal feet. If frame is made of angle <br />larger than 12" x 12" x 3/16 ", the next size angle may be used as brace. <br />All connections between frame work member shall be made with galvanized machine <br />bolts not less than three- eights (3/8) inches in diameter or riveted. Gusset <br />plates or equivalent shall be used in making these connections where the area of <br />- 6 - <br />