Instructions / Assembly

Page A9
7/07
PROPER GUTTER AND DOWNSPOUT SIZING
TABLE 1-4
SLOPED ROOF GUTTERS
Maximum Roof Area for Gutters
in mm sq in sq mm sq ft sq m gpm l/s sq ft sq m gpm l/s sq ft sq m gpm l/s
3 76 3.5 2258 680 63 7 0.44 960 89 10 0.63 1360 126 14 0.88
4 102 6.3 4064 1440 134 15 0.95 2040 190 21 1.33 2880 268 30 2.08
5 127 9.8 6321 2500 232 26 1.64 3520 327 37 2.33 5000 465 52 3.28
6 152 14.1 9095 3840 357 40 2.52 5440 505 57 3.60 7680 713 80 5.05
7 178 5520 513 57 3.60 7800 725 81 5.11 11040 1030 115 7.26
8 203 25.1 16190 7960 739 83 5.24 11200 1040 116. 7.32 14400 1338 165 10.4
10 254 39.1 25220 14400 1338 150 9.47 20400 1895 212 13.4 28800 2676 299 18.9
Diameter of C.S. Area Level Level 1/8 in per ft slope 1/4 in per ft slope
gutter (3.2 mm/.3 m) (6.4 mm/.3 m)
3 in.
76.2 mm
100 200 300 400 500 600 800 1000 1500 2000 3000 4000
9.3 19 28 37 47 56 74 93 139 186 279 372
12
11
10
9
8
7
6
5
4
3
305
279
254
229
203
178
152
127
102
4 in.
102 mm
5 in.
127 mm
6 in.
152 mm
7 in.
178 mm
8 in.
203 mm
9 in.
229 mm
10 in.
254 mm
11 in.
279 mm
12 in.
305 mm
13 in.
330 mm
14 in.
356 mm
15 in.
381 mm
CHART 1-2
HALF ROUND GUTTER SELECTION
Width required for given roof areas and rainfall intensities
Roof Area (A) (Square M)
Roof Area (A) (square feet)
rH reP .nI )1( ytisnetnI llafniaR .
rH reP .mm )1( ytisnetnI llafniaR .
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