Overview
Cornish coastal properties get wind loads two or three times what an inland installation faces. A door that was 'just about sealed' inland will fail near the coast - margins have to be tighter.
Symptoms
- Draught in strong wind, fine in still weather.
- Curtains or doors moving in a closed hallway.
Common causes
- Marginal seal compression.
- Coastal pressure differentials.
- Letterplate flap not closing fully.
When to call a professional
- Compression adjustment or coastal-grade seal upgrade.
Prevention
- Coastal properties: check compression twice a year.