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insulating metal studs for cathedral ceiling in South

txdirection | Posted in Energy Efficiency and Durability on

The house walls will be ICF and the roof framing 2 x 8 16 g steel.  The ceilings will be cathedral.  What is the best way to insulate?  Extremely high termite/formosan population.  Considering radiant barrier on interior of 3/4″ plywood decking with R-30 (7.5 inch) below that and then sheet rock.  Little concerned about ventilation/moisture issues with this setup.  Any ideas?

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  1. Expert Member
    BILL WICHERS | | #1

    Can you put all your insulation on the exterior using layers of rigid foam? This would be "commerical style" roof insulation, and would eliminate most of the issues you're concerned with.

    If you're worried about critters tunneling in the rigid foam, line the edges with metal flashing or stainless steel screen.


  2. txdirection | | #2

    Thanks for the reply. I have considered that and will be contacting TDI to see if it will still meet windstorm requirements as I am in a hurricane zone. The polyiso insulation looks like the best bet, something like the Hunter panels would be plan B. Problem is this route is a little pricey but if it keeps humidity out should be worth it. Also, I completely agree about the screen or flashing, even though there will be nothing structural they can eat I don't feel like sharing my home with those little critters.

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