Overview
In winter the slab contracts slightly and the seal stiffens. If the door was well-sealed in summer, you may lose compression in December. Compression adjustment brings the door tighter to the frame.
Symptoms
- Draughts in cold weather.
- Rattle when it's windy.
- Whistling.
Common causes
- Normal thermal contraction.
- Aged seal that has lost its bounce.
When to call a professional
- Compression adjustment or seal replacement.
Prevention
- Silicone-treat seals in autumn.