Start by looking for plugged drains.
How to repair a flat roof drain.
Often something as simple as a clogged drain can cause serious pooling on a flat roof.
Dry it thoroughly and prepare the surface by rubbing it with coarse sandpaper.
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Dry the puddled water with old rags or towels and allow the roof exterior to completely air dry.
Step 4 replace parts.
If it is a large hole which has caused significant damage cover the roof cement with a piece of sheet metal as an additional patch.
Unclogging the drain will solve the problem.
3 use the utility knife to cut a 12 inch diameter circular patch out of the rolled asphalt roofing.
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Published on nov 3 2015.
The board is installed in steps with the thinnest boards at and around the drains.
The next place to look is at gutters or draining channels.
Spread roofing cement over the hole in the roof drain and the surrounding area before leaving it to dry.
Repair flat roof seams and drains with polyprene.
Poor drainage can lead to serious issues with flat roofing from leaks to structural damage.