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Flat concrete roof with a few leaks, how do I properly seal it up?

Flat concrete roof with a few leaks, how do I properly seal it up?

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  #1  
Old 06-05-18, 06:12 PM
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Flat concrete roof with a few leaks, how do I properly seal it up?

Hi all.

My wife and I just bought a 24' x 30' cement block building, 8x8x16 exterior blocks, 4x8x16 interior blocks, 14' ceiling, 8" thick reinforced concrete flat roof. It's essentially a bunker. When the zombie apocalypse starts, we're safe.

But the roof has numerous leaks we'd like to seal up, and I really can't find much help on Google for this project.

Any help would be greatly appreciated.

Thanks!
 
  #2  
Old 06-05-18, 06:16 PM
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Google Elastomeric roof coating.

I would probably suggest that you clean, blow out, and caulk any apparent cracks first, using a quality concrete expansion joint sealant like Geocel, Sikaflex or NP1.
 
  #3  
Old 06-05-18, 07:14 PM
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Good lord, that's $40+ a gallon! I had a guy recommend a fiberglass reinforced asphalt coating from Black Knight, but I'm unsure how well it would work. It's substantially cheaper at around $45 a pail.
 
 

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