Weatherproofing a flat roof hatch

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Old 11-01-12, 06:42 PM
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Weatherproofing a flat roof hatch

The storm blew the roof hatch off of our flat roof. The hatch is just a sheet of plywood screwed to a rectangle of 2x4's that sits over a 2x4 lip on the roof. I built a replacement, but the EPDM rubber sheet on the old one was too small, causing rot, so I can't reuse it. I'm having trouble sourcing a 4'x6' sheet of rubber, so I was wondering, would it be enough to paint the hatch with some sort of roof coating like this one? It would be $15 instead of $50+ ordering rubber sheet online.

And yes, I will be adding latches.

Thanks for your help.
 
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Old 11-01-12, 06:59 PM
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I don't know if I would trust that product. What about a membrane instead?
 
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Old 11-01-12, 08:50 PM
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I've used lots of Henry's 201 on our carport roof, and for the most part it works quite well. A trick to keep it from developing cracks is to broadcast roofing mineral (fine aggregate) over it while still wet--doing so makes it more stable in the hot sun, and less likely to debond. For a small hatch it should work just fine.
 
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