Possible causes
- Ponding water from poor falls or blocked outlets
- Splits, blisters or cracks in ageing felt
- Failed detailing at upstands, roof lights and edges
- Damage from foot traffic or plant equipment
Warning signs
- Water sitting on the roof days after rain
- Blisters or bubbles in the surface
- Damp ceilings below the flat roof
Typical solutions
- Clearing outlets and localised patch repairs
- Re-detailing upstands and edges
- Replacing the covering with felt, GRP or EPDM