Installing Laminate Flooring Over 1.5″ XPS?
I have an unheated slab on grade in CZ 4b.
My plan is to glue down 1.5″ XPS and tape the seams to create a vapor barrier, then install laminate directly to the XPS.
The XPS product I have available is 20PSI compressive strength.
Will this be sufficient, or would I need to at least use a 1/2″ OSB subfloor layer?
If I used a thinner flooring product like LVP would I need to add the OSB subfloor in that case?
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