Painting To Waterproof Underside Of A Deck - Flooring - DIY Chatroom Home Improvement Forum
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Old 04-29-2014, 02:29 PM   #1
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painting to waterproof underside of a deck


Trying to build a room under an outside deck and am not sure how to waterproof the deck so the room will be dry.

I'm thinking the use of roofing felt covered by Advantec partical board, then painted with one of the new thick deck restore paints might do it. Any suggestions? Thanks
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Old 04-29-2014, 04:06 PM   #2
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Not even close.
No plywood or OSB product is going to hold as a decking, painted or not.
No paint is going to hold up on Advantech.
Look into "Under Decking".
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Old 04-29-2014, 04:25 PM   #3
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I agree. Not even close!!

That's a flat roof. How is tarpaper with a few thousand holes in it going to be watertight?

In order to keep using the deck as a deck you'll have to do a lot more things. Start reading here; http://www.schluter.com/5228.aspx

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Old 04-29-2014, 05:52 PM   #4
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I must not have been clear. The existing deck is 2x6 pressure treated and I was going to use the roofing felt over it, then the Advantech, then the paint. I agree the roofing felt might not be the best. How about 5 mil plastic? Still not good? Thanks, Jack
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Old 04-29-2014, 06:11 PM   #5
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There are many systems made that go UNDER the deck to divert water away and allow for a dry patio under the elevated deck----

I googled this subject long ago---lots of choices on the market---
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Old 04-29-2014, 06:51 PM   #6
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No Jack. Pressure treated isn't going to stop water. Plastic isn't going to stop water either. Especially after you've installed the board which will create hundreds of holes in the plastic.

You first need to make sure the deck framing is adequate for the process. (most decks are too flimsy). Then the deck should have a slope for water to run off. Install exterior glue plywood, then a concrete backer. You follow with a waterproofing system, such as Ditra with Kerdi on the seams and also you have to flash up the walls of the house. *I see now they do Kerdi and then Ditra Drain membrane. Then the porcelain or other outdoor rated tile for the area you live in.

The framing is very important. Not only does it have to be stiff enough for the traffic loads, but it has to withstand snow and wind loads too.

There's a few ways to do it right, and many ways to do it wrong.


The above video is just and idea for you. Your deck is wood, so the first few steps are not shown.

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Old 04-30-2014, 10:40 AM   #7
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Communication is very important, and I now realize that I have not explained the situation properly. I'll try to start over.

The existing deck is a 580 sq. ft. totally covered deck with a proper roof, etc. The deck does not get a lot of moisture except for a blowing rain or snow which is minimal. I want to install a 100 sq. ft. room underneath the dry part of the deck but need to keep out any spills, etc. from the upper part. The floor to joist height underneath is just shy of 8 ft. If I install corrugated or other drainage underneath, then insulate it, I'll be left with a 7 ft. ceiling. (Which might be the best after all)

I did not explain properly that if I use the Advantech over roof felt or plastic or better over EDPM that the entire system would "float" with no screws or nails, except around the perimeter. I would cover the entire 580 aq. ft.

Your ideas are very helpful, but I can't afford a tile system, etc.

I am in the North Carolina mountains and freeze/thaw is a consideration also. Thanks so much for you guidance. Jack
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Old 04-30-2014, 02:07 PM   #8
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DDawg just faced a similar situation---2-Story Addition...Trials And Tribulations - Project Showcase - DIY Chatroom Home Improvement Forum

Rather a long thread--you may wish to PM him and ask him to look at this thread.

Also--Google--waterproofing a porch deck (contractor talk)
This has been discussed several times there by builders--Mike--
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