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Last Updated 4/12/2024
ASCE 7-22 FORTIFIED™ Wind Uplift Design Pressure Calculator
for Residential Roof Coverings (2:12 or Greater)
1,2,3
Mean Roof Height (ft) =
15
20
25
30
35
40
45
50
55
60
Roof Type =
Gable
Hip
Roof Slope =
> 7 to 20 degrees
> 20 to 27 degrees
> 27 to 45 degrees
Design Wind Speed, V
ult
(mph) =
130
140
150
160
170
180
Exposure =
C
D
Wind Uplift Design Pressures (psf):
Refer to
FORTIFIED Standard Detail F-G-2
below for locations of Zones 1, 2, & 3
Notes:
1.
Wind uplift design pressures provided are Component and Cladding (C&C) ASD pressures acting away from the roof surface per
FBC 2023 Table R301.2(2)
.
Minimum pressures for FORTIFIED correspond to V
ult
= 130 mph with Exposure C.
2. This design aid is intended to be preliminary guidance for
section R905.1 of 2024 IRC
for use with the FORTIFIED Home™ Program. Design pressures must meet or exceed local code requirements. This aid does not supplant the need for drawings or plans to be reviewed and signed by a professional engineer.
3.
Understanding design pressures is critical to selecting and installing roofing materials to comply with the IRC and the FORTIFIED Home™ program. Refer to
FORTIFIED Technical Bulletin FH 2020-01
for additional guidance.
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