Instructions / Assembly

Page A8
7/07
PROPER GUTTER AND DOWNSPOUT SIZING
CHART 1-1
WIDTH OF RECTANGULAR GUTTERS FOR GIVEN ROOF AREAS
AND RAINFALL INTENSITIES
50000
40000
30000
20000
15000
10000
7200
5000
4000
3000
2000
1500
IA = 1000
L = 1000
15
20
30
40
50
60
117,983
94,386
70,789
47,193
35,395
23,596
16,989
11,798
9,439
7,079
4,719
3,539
2,359
3.0
4.6
6.1
9.1
12.2
15.2
18.3
0.50 0.60 0.70 0.80 0.90 1.00 1.25 1.50 1.75 2.00 2.2
5
2.50
W = 11" (279 mm)
10" (254 mm)
9" (229 mm)
8" (203 mm)
6" (152 mm)
WIDTH OF GUTTER 7" (178 mm)
5" (127 mm)
4" (102 mm)
3" (76 mm)
2" (51 mm)
M = D/W
IA = RAINFALL INTENSITY x AREA (AREA FROM TABLE 1-1 THAT RELATES TO L)
M = DEPTH/WIDTH
TEEF – RETTUG FO HTGNEL = L
)TUOPSNWOD A YB DEVRES(
SRETEM – RETTUG FO HTGNEL = L
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