9628 Valley Blvd. Rosemead, CA 91770 | Phone 626-579-3288 | [email protected]
SWH Solar Racking Installation Guide | Version 12.10.v2
[1.2.] Procedure to Calculate Total Design Wind Load per ASCE 7-10
Table 4. p
net30
(psf) Roof Overhang
Step 7. Determine adjustment factor for height and exposure category, l
Using the Exposure Category (Step 3) and the roof height, h (ft), look up the adjustment
factor for height and exposure
(λ)
in Table 5, page 19.
Roof Overhang Net Design Wind Pressure, P
net30
(psf)
Zone
Effective
wind area
(sf)
Basic Wind Speed V (mph)
110
115
130
140
150
160
180
200
(Exposure B at h=30 ft.)
2
2
2
2
3
3
3
3
10
20
50
100
10
20
50
100
-36.9
-35.8
-34.3
-33.2
-36.9
-35.8
-34.3
-33.2
-40.3
-39.1
-37.5
-36.3
-40.3
-39.1
-37.5
-36.3
-51.5
-50.0
-47.9
-46.4
-51.5
-50.0
-47.9
-46.4
-59.8
-58.0
-55.6
-53.8
-59.8
-58.0
-55.6
-53.8
-68.6
-66.5
-63.8
-61.7
-68.6
-66.5
-63.8
-61.7
-78.1
-75.7
-72.6
-70.2
-78.1
-75.7
-72.6
-70.2
-98.8
-95.8
-91.9
-88.9
-98.8
-95.8
-91.9
-88.9
-122.0
-118.3
-113.4
-109.8
-122.0
-118.3
-113.4
-109.8
-40.6
-40.6
-40.6
-40.6
-68.3
-61.6
-52.8
-46.1
-44.4
-44.4
-44.4
-44.4
-74.6
-67.3
-57.7
-50.4
-56.7
-56.7
-56.7
-56.7
-95.3
-86.0
-7.7
-64.4
-65.7
-65.7
-65.7
-65.7
-110.6
-99.8
-85.5
-74.7
-75.5
-75.5
-75.5
-75.5
-126.9
-114.5
-98.1
-85.8
-108.7
-108.7
-108.7
-108.7
-182.8
-164.9
-141.3
-123.5
-134.2
-134.2
-134.2
-134.2
-225.6
-203.6
-174.5
-152.4
-85.9
-85.9
-85.9
-85.9
-144.4
-130.3
-111.7
-97.6
-31.4
-30.8
-30.1
-29.5
-51.6
-40.5
-25.9
-14.8
-34.3
-33.7
-32.9
-32.3
-56.5
-44.3
-28.3
-16.1
-43.8
-43.0
-42.0
-41.2
-72.1
-56.6
-36.1
-20.6
-50.8
-49.9
-48.7
-47.8
-83.7
-65.7
-41.9
-23.9
-58.3
-57.3
-55.9
-54.9
-96.0
-75.4
-48.1
-27.4
-66.3
-65.2
-63.6
-62.4
-109.3
-85.8
-54.7
-31.2
-84.0
-82.5
-80.5
-79.0
-138.3
-108.6
-69.3
-39.5
-103.7
-101.8
-99.4
-97.6
-170.7
-134.0
-85.5
-48.8
Roof 0 to 7 degr
ees
Roof 7 to 27 degr
ees
Roof > 27 to 45 degr
ees
2
2
2
2
3
3
3
3
10
20
50
100
10
20
50
100
10
20
50
100
10
20
50
100
2
2
2
2
3
3
3
3
18
