vapor barrior under snap lock

Guest User
Building a stand alone covered deck. Snap lock roof over purlins. What is best way to prevent dripping moisture?
Eric Novotny
An informed customer is the Best Customer!
Insulation and proper moisture control. Easiest and most effective insulation is going to be SPF (Spray Polyurethane Foam). I still do not prefer spraying to the back side of the metal in this case. I would always want to see some sort of isolation layer like a rigid foam.

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