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Barrier X-5 underslab insulation
I have a contractor that has asked me to do some research on a underslab insulation called the Barrier X5. We have always in the past used 2' Blueboard underslab. He recently spoke another contractor/friend who told him his experiences with the Barrier. He likes the facts that it is not only a insulator but also a vapor barrier.
Is it truly an insulator of R 7.2 Blueboard is the proven product and I want to make sure we are doing the right.
What do you think?