Weatherstrip Wind Rating

Weatherstripping is the rubber or foam seal around doors and windows. Good seals block wind and rain from squeezing through gaps. Watch how different seal types perform when wind pushes against them.

0.30 CFM Max
8 PSF Water Test
EPDM Material
Seal Compression Test
0.15
CFM/sq ft
Compression
0.15 CFM
Fin Seal
0.25 CFM
Bulb Seal
0.10 CFM

Seal Types

Different seal designs work better for different situations. Here is how they compare for hurricane protection.

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Compression Seal

0.15
CFM/sq ft

Squishes flat when door closes. Best for maintaining seal when door flexes from wind pressure. EPDM rubber lasts longest.

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Fin Seal

0.25
CFM/sq ft

Flexible fingers brush against surface. Good for sliding doors where panels move. Less effective at blocking high-pressure rain.

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Bulb Seal

0.10
CFM/sq ft

Hollow rubber tube compresses evenly. Best air infiltration rating but more expensive. Ideal for HVHZ impact doors.

Frequently Asked Questions

Common questions about weatherstripping for hurricane zones.

What weatherstrip rating do I need for Palm Beach hurricane zones?
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Weatherstripping for HVHZ must pass water infiltration testing at design pressure, typically 8+ PSF for residential doors. Look for products tested to AAMA/WDMA/CSA 101 standards with air infiltration below 0.30 CFM per square foot at 25 mph wind pressure.
What is the difference between compression seals and fin seals?
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Compression seals squish flat when the door closes, creating an airtight barrier. Fin seals use flexible fingers that brush against the door surface. Compression seals work better for hurricanes because they maintain contact even when the door flexes from wind pressure.
How often should hurricane weatherstripping be replaced?
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Inspect weatherstripping yearly before hurricane season. Replace if you see cracks, gaps, or the seal does not spring back when pressed. Most quality EPDM or silicone weatherstripping lasts 5-10 years in Florida, but sun exposure and salt air shorten lifespan near the coast.
Can weatherstrip failure cause window or door failure in hurricanes?
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Yes, failed weatherstripping allows water intrusion which can damage interior finishes and structure. More critically, air leakage through bad seals can pressurize the building interior, increasing roof uplift forces. Maintaining good seals is part of keeping the building envelope intact.

Calculate Your Seal Requirements

Get precise weatherstrip specifications for any door or window. PE-stamped calculations available.

Calculate Wind Loads View Pricing