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Community and Q&A

Exterior stain residual

user-228058 | Posted in Green Products and Materials on

I am converting my barn and some of what was the exterior surface will be within the insulated wall assembly. This surface was stained by the previous owner last spring with a exterior deck stain TWP 1500. Wondering if I should be concerned about some residue of the pReservative being in my wall assembly. Not sure how I could get it off othe than planning the exterior or something like that. Or perhaps pressure washing would remove a bit of it. Any one have any thoughts… Thanks

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  1. user-2310254 | | #1

    I would not feel comfortable having this material inside a conditioned space based on the safety data sheet. ( But I am particular about air quality.

  2. charlie_sullivan | | #2

    I looked at the data sheet Steve posted, and I wouldn't be worried. Most of the hazards listed are highly volatile solvent that should be long gone. The one other I noticed is folpet fungicide. You wouldn't want exposure to that, but I think it's the opposite--not volatile at all and will stay in the coating. So my non-expert assessment is that you should not be worried.

  3. user-228058 | | #3

    Thanks , for me the litmus is knowing , or having a strong likelihood that most of the stuff has dissipated. The stained surface would be within the wall assembly. So not really inside, just in the cavity of the wall..

  4. GBA Editor
    Martin Holladay | | #4

    If the boards aren't exposed to indoor air, I don't think that you need to worry. It would probably be a good idea, though, to have an air barrier (perhaps drywall) between the boards and the indoor air.

    -- Martin Holladay

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