thickness square ft/gal 215 7.5 165 9.5 150 10 140 11 120 13 95 17 90 18 85 19 80 20 75 21.5 70 23 65 24.5 60 25 55 29 50 32 45 35.5 40 40 35 46 30 53 25 64 20 80 15 107 10 150 8 200 6 267 5 300 4 400 2 800 1 1600 wet millimeters m 2/litr m2/u.s.gal 5.5 0.19 0.7 4.2 0.23 0.88 3.8 0.25 0.93 3.6 0.27 1.02 3 0.32 1.21 2.4 0.42 1.58 2.3 0.44 1.67
