"I use 20 mil poly on my crawlspaces and now a high traffic 90 mil has been added to the marketplace. Usually they have a scrim fiber between layers to resist tearing. Remember a 1/2" hole negates the purpose of sealing in 1500 ft. so the better…"
"Matthew, if you use 2 lb EPS or 25psi in two layers staggered layers 4" overall then you can put a 2x4 flat for bearing. This allows for smaller joist while giving you R20 minimum. Then between the joist I would put any batt insulation but put…"
"Paul, I have used stud cavity returns on interior walls only,but always metal lined to inhibit odor absorption by the materials. The standard size limitation of the cavity usually under sizes your return unless using multiple bays."
"Bill, I was trying to keep a gap between the metal roof and insulation for air movement and to allow a cooler insulation on contact. I had a ureathane company for 13 years and cannot stress more strongly don't install it inside the envelope.…"
"Bill, Most foam applicators use plural mixing machines with generators 25KW or bigger I believe logistics and cost will rule this out.
You did a great job structurally with your screw pattern to purlins and deck that's why you haven't lost…"
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