A split in a flat-roof covering can let water through, but simply covering the visible line is not always the right repair. Check why the split formed, how far it extends and whether the surrounding construction remains sound.
Why flat roofs split
Splits can be associated with ageing, movement, stressed details, failed joints or deterioration in the covering. A small isolated split is a different problem from repeated splitting across an ageing roof.
Check the surrounding area
- Look for more than one split or crack.
- Check for lifting, blistering or failed seams nearby.
- Do not ignore a soft or sagging deck.
- Consider whether movement at an edge, wall or detail is driving the failure.
- Confirm the likely leak source before covering anything.
Reinforced local repair
Where the defect is genuinely localised, the substrate is compatible and the surrounding roof is sound, a reinforced liquid repair can incorporate fleece reinforcement across the prepared repair area rather than applying coating alone.
When a patch is not enough
Multiple splits, widespread ageing, structural movement, extensive moisture or an uncertain source should trigger a broader assessment. See the flat roof repair or replacement guide.
Repair kit for an appropriate local defect
The SealForge Kit brings together polyurethane liquid repair material, 1m² of separate fleece reinforcement, primer, catalyst and application tools for an appropriate local repair. It is £129.99 plus delivery.
For diagnosis first, use the Flat Roof Leak Help Centre. Never work on a wet, icy, fragile or otherwise unsafe roof.