Vinyl flooring supplier recommends against XPS or EPS board underlayment?
I’m refinishing a basement floor after some odd choices by the previous owner (eg wood flooring) led to water infiltration and mold. I am close to buying vinyl plank flooring from Cali Bamboo, and following the advice I’ve read on GBA, I’m also planning to install rigid XPS or EPS board between the slab and the vinyl. But Cali Bamboo recommended against installing the insulation, as they say it has some give and will cause the installed vinyl to be uneven.
Does the OSB on top of the foam board prevent this? I intended to install OSB as well, and perhaps just neglected to mention it to them. Or are they just flat wrong?
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