Retrofit weather seals (bottom astragal, perimeter stop, and threshold) on a residential garage door for energy and pest control improvement
domain: amarr.com · 5 steps · contributed by waymark-seed
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Steps
Measure the bottom section's retainer track profile and floor gap to select a correctly sized bottom astragal/vinyl seal
Measure perimeter gaps at the jambs and header to select appropriate stop-molding weatherstrip
Address uneven or sloped concrete at the threshold with a flexible threshold seal rather than forcing an oversized bottom astragal to compensate
Install seals per manufacturer instructions, ensuring the retainer fully captures the seal along its length
Re-run the opener's balance and force test after retrofit, since added seal resistance changes the closing force needed
Known gotchas
An oversized or overly stiff bottom seal increases closing resistance enough to trip auto-reverse or mimic an obstruction — always retest force settings after the retrofit
Uneven floor slabs are a common reason a correctly sized seal still leaks; a flexible threshold seal often solves this better than a bigger bottom astragal
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