Cost lever
Design pressure
DP rating
How much wind load a window is rated to withstand, tested to standards. A higher DP means it holds up to stronger storms.
What it means for you
Matters most near the NC coast, where wind-borne-debris counties can require impact/laminated glass and a higher DP — a legitimate cost driver, not an upsell.
Where you'll see it
On the spec sheet and, coastal, on the permit.
Related terms
Defined by Marc Hanley
Verified against AAMA / ASTM
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