Plus Concrete Bits

Is polyethylene required on a concrete floor before installing underlayment with integrated vapour barrier?
Installing polyethylene vapour barrier sheet plus felt with the integrated vapour barrier (silent walk) underlay seems a bit exagerated under floating floor system and I feel its questionable to have moisture trapped between two vapour barriers. I live in Quebec city,Canada
No, because they would be serving the same purpose. If you were to use both, you then would be trapping moisture between the to vapor barriers and this would then be a problem. Just use the manu's suggested product, this will ensure compliance for warranty issues if they ever arise.
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