Why do composite doors crack?
Composite doors usually crack because of stress on the glass-reinforced plastic skin, not because the material is weak. Common causes are a door binding in a frame that is out of square, impact damage, over-tightened fixings and, less often, heat build-up on dark finishes in strong sun.
How do you prevent cracks at fitting stage?
- Check the opening is square before the frame goes in
- Pack the frame so the slab sits with even gaps and does not rub
- Do not over-tighten hinge and keep fixings
- Do not trim the slab unless the manufacturer permits it
- Follow the maker’s advice on dark colours in sunny positions
Does the core cause cracking?
Seldom. Cracks start in the skin, so check the fit and the fixings first. A rigid core stops the slab flexing, which is one reason a solid composite slab resists bowing better than a hollow uPVC panel.
Can a cracked skin be repaired?
Small chips and hairline cracks can often be filled and re-coloured. A large split or a delaminating skin means replacing the slab. Check the manufacturer’s guarantee first. For slabs and doorsets, see our composite doors range at the Worthing trade counter.
Need a trade price? Call the trade counter on 01903 262 636 or visit us at Unit 1, Friar Walk, Worthing. We offer free delivery within 30 miles.
← Back to Supply Only Doors FAQs | See our supply only doors
