My uncle told me to always use a 6 mil vapor barrier on concrete slabs, even if the builder says it's dry.
He was a floor guy for 40 years, so I listened. On a job in Spokane last fall, the builder insisted the slab was cured and ready. I put the barrier down anyway. Two months later, the homeowner called to say the floor in the room next door, where another crew skipped the barrier, was buckling. That one call saved me a huge headache. How do you all handle pushback on prep steps you know are right?