Structural Performance - Water Resistance
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Watertightness is measured by projecting the equivalent of 5 U.S. gallons of water per hour per square foot of window area - the equivalent of 8 in. of rain in 1 hour. Air pressure is increased to simulate winds varying between 35 and 76 mph. Rating indicate the pressure attained without any interior water leakage.
| Wind Pressure |
Grade (USA) |
Window Type |
| 700 pascals - 14.6 psf |
DP 85 |
Gilkey fixed, casement and awning windows |
| 400 pascals - 8.4 psf |
DP 55 |
Gilkey sliding and hung windows |
| 300 pascals - 6.3 psf |
DP 40 |
High-end |
| 200 pascals - 4.2 psf |
DP 30 |
Mid-range |
| 150 pascals - 3.0 psf |
DP 20 |
Low-end |
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The results are from national tests under the following standards:
AAMA NWDA 1011.S2-97
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