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1968 pine plank flooring & air sealing?

Cz4a_Giovanni | Posted in GBA Pro Help on

I had to remove a section of  water damaged 1/4 plywood from beneath water damaged flooring. Beneath the plywood, was old vinyl flooring, and just atop pine planks is roofing paper.

Once i remove the roofing paper, 1. What, if with anything should i replace the roofing paper with, before re-install of new 1/4 inch plywood) and the why behind your suggestion?

(House details: Only 1 floor; crawlspace beneath (all fiberglass insulation has been removed, new 8mil plastic installed, and attached/taped to Block. Vents are all sealed shut & dehumidifier installed. I am a bit concerned of the big gaps in the pine planks… dont wish to have a bunch of Crawl air infiltration into main living area if i can help it).

Giovanni

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Replies

  1. charlie_sullivan | | #1

    You didn't mention your climate zone--that might matter. I agree that an air barrier is useful, although it's not necessarily essential. You could achieve that by taping the 1/4" plywood. Or you could use some kind of membrane there. You might be able to solve or create some moisture problems with a specific level or permeability of the membrane, but without knowing your climate or knowing any problems we are trying to solve, I would suggest that if you use some kind of membrane it should be vapor open. Then the only reason to do that would be if you thought it would be easier to get that air tight than to tape the plywood seams for the same purpose.

    Sometimes rosin paper is recommend between wood floor and subfloor to avoid or reduce squeaks. I don't expect that would be needed here but it's cheap and does no harm.

    1. Cz4a_Giovanni | | #2

      Charlie,

      Sorry about leaving that detail out...i thought i had saved it on my screen name...Cz 4a.
      My intention is to prevent mold problems. House had a bad roof leak that i am cleaning up from prior owners. So, yes my thoughts were to use somthing permeable and somthing that cant be used for mold food like a plastic, either Tyvex or Certainteeds Membrain. Not certain which of the two would be more appropriate.

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