Possible causes
- Splits, blisters or cracks in old felt
- Ponding water from poor falls
- Failed upstands and trims at the edges
- Wet or rotten deck boards
Warning signs
- Water pooling for days after rain
- Damp ceiling in the extension or garage
- Bubbles or cracks in the surface
Typical solutions
- Local patch repairs where the deck is sound
- Full replacement with EPDM rubber, GRP fibreglass or torch-on felt
- Correcting falls so water drains
When to get it inspected
As soon as water comes through. Flat roof decks can rot quickly once wet, which turns a repair into a replacement.
This page is general guidance, not a diagnosis. Call 01322 902061 to book an inspection, or read about our flat roofing service.