A flat roof that starts leaking after a storm may have suffered a new local defect, or the weather may simply have exposed an existing weak point. Wait for safe conditions before inspecting the roof.
What storm weather can reveal
Wind-driven rain can expose weaknesses at edges, wall junctions, seams and details. Debris can also cause local damage, while blocked drainage can increase standing water. The timing of the leak is useful evidence but does not identify the defect by itself.
What to inspect
- New cracks, splits or punctures.
- Lifted or separated edges and joints.
- Wall and upstand details.
- Rooflights, outlets and penetrations.
- Blocked drainage or unusual ponding.
- Any signs of wider roof or deck damage.
Can storm damage be repaired locally?
If there is one limited compatible defect and the surrounding roof and deck remain sound, a reinforced local repair may be considered. Widespread damage, structural movement or an uncertain source should be professionally assessed.
SealForge reinforced repair
For an appropriate local defect, the SealForge Kit contains polyurethane liquid repair material, separate fleece reinforcement, primer, catalyst and application tools. Price: £129.99 plus delivery.
For diagnosis, use the heavy-rain leak guide and Flat Roof Leak Help Centre. Never access a wet, icy, fragile or unsafe roof.