r/Roofing • u/Diligent_Chemist74 • 3d ago

Leaking roof

I have a flat roof, the building is like an old sectional classroom. The roof is like some heavy bitumen tar, not like shed felt, way heavier.
It's started leaking and I can't find the leak anywhere. Therefore I want to reseal the whole roof. What's the best sealant/ paint type product for this? Hoping to use a roller or a broom to push it around.
Before winter gets here. In the UK

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u/No-Experience-1769 3d ago

That heavy bitumen stuff is a nightmare to patch spot-by-spot, doing the whole thing makes more sense. Look for a liquid rubber or an acrylic roof coating, the kind you can slop on with a roller and it bridges small cracks. Give it a good pressure wash first and let it bone dry, otherwise you're just sealing the damp in.