Answer for Sealing bottom-underside of deck?

Here's the problem that causes rot. The top of the frame, where the floor boards are screwed, is still raw and it has a hole where the screw is. This is where water gets in. It needs a way out and this is the nearest edge. If this edge is sealed the water is stuck and can't get out quickly.

I have seen deck builders use a rubber membrane to seal the top of the frame. This is the same self adhering rubber membrane used for roofing. I think this is the best idea I have ever seen for deck construction.

I have seen a lot of rot damage on deck frames and all has had the frame sealed. Something to think about.

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Answer for Sealing bottom-underside of deck?

okay, I was under the impression that the underside had to be sealed to prevent moisture from getting in..

  • By Anonymous
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Answer for Sealing bottom-underside of deck?

Truth? No. The stain will not seep all the way through the wood. At best it will soak a 1/4 inch into the wood.

Normally staining the underside of the deck wood and frame isn't needed nor is it a good idea. The wood needs to breath and release any collected moisture and staining all of this will prevent this from happening. This will speed up rot.

  • By crowderpainting
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