New answers tagged linoleum
It is not uncommon to apply a coat of embossing compound over a firmly bonded vinyl floor, then tile right over it. It certainly is not my favorite method, but as long as the existing vinyl is well adhered and not curling at sides etc. the tile should stay down well. Since you have already removed most of the vinyl, I would not worry too much about some ...
I don't think the felt is hurting anything since it is common to apply thinset to a common material in showers (Kerdi). Basically you would be worried that the felt will keep the thinset from binding to the concrete. Well it won't even without the felt. It will fit snug either way but there is no binding.
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