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Old 08-18-2017, 01:16 PM   #1
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Waterproofing roof and ceiling

Hello everyone! Thanks for popping in. I am wondering what may be a good approach to water proofing my roof outside and the ceiling inside.
I am going to be putting a roof deck on top of Meri so, there will be holes for the mounting hardware that are going to to be fastened into the steel ribs of the roof.
Before I deck it however, I want to coat both the roof outside and the ceiling inside for 100% water proofing.

Anyone?
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Old 08-18-2017, 01:21 PM   #2
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I would suggest using 3M 5200 to seal anything bolted to the roof, it's a waterproof glue used in boat building, although it's great it can sometimes be impossible to remove so keep that in mind as well, just drill your hole put a ring of 5200 around it when you bolt it down don't tighten it all the way just enough to seal it tight then let it set up for about 12 hr then tighten it down. the rest of the roof can be sealed with any rv roof sealer coat(the thick rubbery white paint).
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Old 08-18-2017, 01:38 PM   #3
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I'd use 3m seam sealer, and then I'd paint it flat white with regular old rustoleum. It'll look good, be sealed, and won't peel, yellow, or have dirt stick to it. Flat white will also do the best job of reflecting the sun's heat away.
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Old 08-18-2017, 02:11 PM   #4
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water proofing membrane for interior?

Thank you for the exterior advice!



Is Red Guard a suitable product for the ceiling inside?

I'm a contractor and have used it before for tile installs.

Custom Building Products RedGard 1 Gal. Waterproofing and Crack Prevention Membrane-LQWAF1 - The Home Depot
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Old 08-18-2017, 02:30 PM   #5
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I already painted the outside of the roof with alumicoat. I'm wondering if I should strip that and apply something else.

Also wondering if Red Guard waterproofing membrane is a good choice of product for the inside ceiling before I insulate.
Custom Building Products RedGard 1 Gal. Waterproofing and Crack Prevention Membrane-LQWAF1 - The Home Depot


Any thoughts?
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Old 08-18-2017, 03:10 PM   #6
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How about waterproffing the inside ceiling?

Is Red Guard waterproofing membrane a good choice?
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Old 08-18-2017, 03:22 PM   #7
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Quote:
Originally Posted by Merideth Story View Post
How about waterproffing the inside ceiling?

Is Red Guard waterproofing membrane a good choice?
as long as the roof is water tight from above I see no reason to seal it on the inside, what do you plan to do with the bus? I have no first hand experience with red guard so ill leave that to others, the website says its pink and not paintable. IMHO I wouldn't seal it from the inside without first sealing the outside otherwise what ever goes through the outside will be trapped in the layers from the inside seal and could cause more problems.
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Old 08-18-2017, 03:32 PM   #8
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I have used this stuff https://www.epdmcoatings.com/liquid-roof.php on my trailers, and RV's with good results. It isnt the cheap way to go but lasts for years in the hot california sun
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Old 08-18-2017, 04:57 PM   #9
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Originally Posted by Merideth Story View Post
How about waterproffing the inside ceiling?

Is Red Guard waterproofing membrane a good choice?
If you need to waterproof your inside ceiling something is seriously amiss.
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Old 08-18-2017, 06:50 PM   #10
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If you need to waterproof your inside ceiling something is seriously amiss.
im thinking indoor water fights here
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