FEMA P55 Coastal Construction Manual, Fourth Edition - Mad Cad

Volume II Designing the builDing envelope 11
Table 11-1. Allowable Basic Wind Speed as a Function of Class
ASTM D7158
Allowable Basic Wind Speed
Class (a) Based on ASCE 7-05 Based on ASCE 7-10
D 90 mph 115 mph
G 120 mph 152 mph
H 150 mph 190 mph
(a) Classes are based on a building sited in Exposure C. They are also based on a
building sited where there is no abrupt change in topography. If the residence is
in Exposure D and/or where there is an abrupt change in topography (as defned
in ASCE 7), the design professional should consult the shingle manufacturer.
Figure 11-30.
Loss of shingles and
underlayment along the
eave and loss of a few
hip shingles. Estimated
wind speed: 115 mph.
Hurricane Katrina
(Louisiana, 2005)
Figure 11-31.
Loss of shingles and
underlayment along
the rake. Estimated
wind speed: 110 mph.
Hurricane Ike (Texas,
2008)
COASTAL CONSTRUCTION MANUAL 11-31