. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 144 BULLETIN 414, U. S. DEPAETMEISTT OF AGEICULTUEE. from 3 to 6 inches, the larger laps being used on the lower pitches. For the side lap it is recommended that each alternate sheet be laid upside down and lapped as shown in (a) rather than (h), figure 9. By this method, when water is blown through the first lap, it will stop and not pass the haK lap, but run down and out at the end of the sheet. In applying to the sheathing or wooden strips, the sheets should be secured by nailing through the tops of the corrugations
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 144 BULLETIN 414, U. S. DEPAETMEISTT OF AGEICULTUEE. from 3 to 6 inches, the larger laps being used on the lower pitches. For the side lap it is recommended that each alternate sheet be laid upside down and lapped as shown in (a) rather than (h), figure 9. By this method, when water is blown through the first lap, it will stop and not pass the haK lap, but run down and out at the end of the sheet. In applying to the sheathing or wooden strips, the sheets should be secured by nailing through the tops of the corrugations, the nails being driven through every alternate corrugation at the ends and about 8 inches apart at the sides. In ordering corrugated sheets an allowance must be made for the laps. The following table (17) gives the number of square feet. Fig. 9.—Proper (a) and improper (b) manner of laying corrugated roofing. necessary to cover 100 square feet of actual surface, using sheets 8 feet long. If shorter sheets are used, the allowance must be slightly increased. Table 17.—Nuviber of square feet of corrugated sheets to cover 100 square feet of roof. End laps. 1 incli. 2 inclies. 3 inclies. 4 inclies. 5 inches. Square Square. Square Square Square feet. feet. feet. feet. feet. 110 Ill 112 113 114 116 117 118 119 120 123 124 125 126 127 6 inches. Side lap, one corrugation Side lap, one and one-half corrugations. Side lap, two corrugations Square feet. 115 121 128 Cement Concrete. Portland cement concrete may be used in a convict camp for vari- ous purposes, such as the construction of floors, building foundations, well casings, and protective coverings, etc. Necessary information yr^ TSBT 'TT. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. :
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