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PVA/PEVA floor primer absolutely necessary?

I'm working on finalizing plans for a multigenerational single family house with gypsum radiant heat on the top floors (in-slab in basement). Radiant heat sound like a dream, but I have some serious concerns about dumping gallons of PVA floor primer on the wood subfloors.

PVA might be considered a "safe" product, but it isn't very stable compared to other primers and adhesives that dry harder. I have some acute respiratory issues, so long term off gassing potential is a serious concern.

Does anyone know how vital the primer is to the integrity of the floor system? Is it absolutely necessary? I'm considering sound mats under the gypsum, but primer is still called for in this setup as well.


  • hot_rod
    hot_rod Member Posts: 22,330
    It's basically Elmers glue, the outgassing goes away quickly.

    I think your gyp installer will insist on it for his product warranty. There may be a low VOC option if you shop around.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream