Block wall exterior insulation and vinyl siding
Climate zone 5. Unfinished above ground block walls. I am converting a vacant building into a small dwelling. I want to buy some reclaimed Polyiso and install 3″, in some combination of thickness, but I am struggling with the placement of layers/furring strips (I suffer from paralysis of analysis). I plan to use vertical vinyl siding too. Also wondering if I should seal the block before covering it. I am also planning to fur out the interior wall, about 2 1/2″ and add some unfaced fiberglass. Replacing the existing windows and installing “outies”.
I found this to be surprising, from Johns Manville:
EXCEPTION: If vinyl siding is to be installed over AP Foil-Faced sheathing, install foam boards with the white nonreflective side toward the vinyl siding.
Technical Guide (d3i80q92llbc1d.cloudfront.net)
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