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DP rating (Design Pressure)
DP rating is a measure of how well a window handles wind pressure and water resistance.
Why it matters
In windy or storm-prone areas, DP rating affects performance and leak risk.
Where people get this wrong
DP rating is not only about hurricanes. Wind-driven rain matters in many places. A good DP rating does not replace good flashing.
Real-world example
A storm hits and rain comes sideways. A window that can handle pressure and water resistance helps you sleep instead of listening for drips.
Where this hits your build
This comes up during selections and installation. Performance depends on the product and the install. A good window installed poorly still leaks.
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