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11-05-2009, 06:18 PM   #1
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Join Date: Jul 2008
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## Window DP ratings

Shopping for windows for an addition. I live in coastal NC and am wondering about what DP rating to get. Any help or leads would be appreciated.

 11-06-2009, 05:47 AM #2 Member   Join Date: Dec 2008 Location: Wilmington, DE Posts: 3,118 Rewards Points: 2,000 DP rating????????????

 11-06-2009, 07:35 AM #3 Mold!! Let's kill it!   Join Date: Feb 2008 Location: Central Pennsylvania Posts: 2,849 Rewards Points: 2,012 DP=Design Pressure. How much wind pressure the window will sustain before failure. Sort of a hurricane resistance rating. The higher the DP number, the more sustained wind the window will resist. Seems to me that If I was in coastal hurricane land, I'd go as high as I could.

 11-06-2009, 05:22 PM #4 Member   Join Date: Apr 2006 Location: East of the Mississippi Posts: 151 Rewards Points: 109 Are you looking for impact resistance as well as specific DP? Do you know what windzone you are in? A simple formula for converting windspeed to DP is to divide the DP by 20 and the square the result. For example, assuming a windspeed of 120: 120/20 = 6. Square 6 = 36. So a DP of 36 is equivalent to a windspeed of 120mph. Keeping in mind that windows are tested for structural at 150% of DP and for water infiltration at 15% of DP, there may be other issues for you to consider. Have you talked to your local code folks for their recommendations? Last edited by oberon; 11-06-2009 at 05:25 PM.

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