The following chart is provided to clarify the DP rating ...
The following chart is provided to clarify the DP rating requirements for each design wind speed per the International Residential Code and the Guidelines for Hurricane Resistant Residential Construction.
DP Rating For Design Wind Speeds (based on 2006 IRC - Table R301.2(2) & 2005 Hurricane Guide - Table 602A)
Center of Wall
Window opening area (sf)
10 20 50 100 500
90mph DP-20 DP-20 DP-20 DP-20 DP-20
100mph DP-20 DP-20 DP-20 DP-20 DP-20
110mph DP-25 DP-25 DP-25 DP-25 DP-20
120mph DP-30 DP-30 DP-30 DP-25 DP-25
130mph DP-35 DP-35 DP-30 DP-30 DP-30
140mph DP-40 DP-40 DP-35 DP-35 DP-30
150mph DP-45 DP-45 DP-40 DP-40 DP-35
170mph DP-60 DP-55 DP-55 DP-50 DP-45
Window opening area (sf)
10 20 50 100 500
Corner of wall (windows located within 4 feet of corner)
90mph DP-20 DP-20 DP-20 DP-20 DP-20
100mph DP-25 DP-25 DP-25 DP-20 DP-20
110mph DP-30 DP-30 DP-25 DP-25 DP-20
120mph DP-35 DP-35 DP-30 DP-30 DP-25
130mph DP-45 DP-40 DP-35 DP-35 DP-30
140mph DP-50 DP-45 DP-40 DP-40 DP-30
150mph DP-55 DP-55 DP-50 DP-45 DP-35
170mph DP-70 DP-65 DP-60 DP-55 DP-45
NOTE: 7/16 inch plywood is only an exception for replacing the requirement for Large Missile tested glazing. It DOES NOT substitute the DP rating requirement. R303.2.1.2
Windows shall meet the requirements of climate zone 2 on Table N1102.1 of the IRC as follows: Fenestration (U-Factor: 0.75 or less) Glazed Fenestration (SHGC: 0.40 or less)
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