I have a room built on an above grade slab, the roof of a tuck-under garage. I want to install a glued 3/8″ plywood prefinished free floating floor over the existing 9″ tiles. Instead of the standard roll underlayment I thought of using 1/2″ polyisocyanurate foam board with reflective foil face for greater R value. As an alternative what about 1/2″ foam sheathing with film facing? Will either of these withstand compression and is the off gas of the polyisocyanurate a consideration? jiminmin
A redesigned Yankee gutter and a well-executed rubber roof ready a midcentury home for its next century.
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