My uncle told me to use a 6 mil vapor barrier on a concrete slab in Phoenix and the homeowner called me back 9 months later with a mold complaint.

Hugo Wilson · 2026-04-16T07:05:10.015336+00:00

He swore it was standard practice everywhere, but in our dry climate it trapped the tiny bit of moisture coming up and ruined a $4,200 glue-down LVP job, so has anyone else in an arid zone had this happen and what do you use instead?

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My uncle told me to use a 6 mil vapor barrier on a concrete slab in Phoenix and the homeowner called me back 9 months later with a mold complaint. | Flooring Installers - Hub Chatter