Foam over roof questions
First, I’m in Zone 4C, the chart says I need R-10 XPS but then says 2.5 inch.
Isn’t 2 inch XPS R-10 already? Is the 2.5 just to play it safe because its on the edge?
If I used 2inch PolyIso foil faced would that be better?
Second, Do people typically foam all the way out to the eaves or just the to the exterior wall intersection?
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