A “DP” or “design pressure” rating is a numerical value given to a building component that represents its ability to withstand a given amount of wind load. ... In practicality, a window or door with a structural DP rating of 50 has passed a structural test pressure of 75 pounds per square foot (equal to a 200 mph wind).
What is a good DP rating for a window?
What's a good dp rating? Typically you'll see residential replacement windows with ratings from 15 to 50. Higher is better. It makes more sense to focus on dp rating when you're in a situation where wind is of particular concern.Feb 7, 2014
What does dp40 mean?
DP 40 is tested up to 155 MPH. DP 50 is tested up to 173 MPH. The higher the DP rating the higher the water resistance as well. A typical hurricane has sustained winds of 100 - 150 mph.
What does DP 30 mean?
In other words, a 30 DP window would have to withstand 45 pounds of pressure per square foot. So, any window in your house that has a design pressure rating of 30 can withstand 10 seconds of 45 pounds per square foot of pressure.
What does DP 50 /- 50 mean?
This window has been tested to a design pressure of 50 (DP50). This means that the window can withstand a wind load of 180 MPH without the window breaking. A DP50 window also has to pass a water test with wind blowing onto the window at 54 MPH.
What is the highest DP rating?
DP 40 is tested up to 155 MPH. DP 50 is tested up to 173 MPH. The higher the DP rating the higher the water resistance as well. A typical hurricane has sustained winds of 100 - 150 mph.
How is DP rating calculated?
The design pressure (DP) rating of a building is calculated using the wind speed of a specified location, the type of exposure the building has, the type of building, the average height of the roof (from eave to peak) and the zone of the wall and roof.