Can I install ridgid polyiso insulation over old yellow pine attic floor boards?
I have an old farmhouse in WV, on the 2nd floor the floor joist’s are exposed and decked from the attic with 5/4″ yellow pine. Would I be able to install ridgid (closed cell) polyiso insulation directly over the floor boards and then cover with 1/2″ sheathing material or am I creating the potential for a moisture problem, if so would furring strips help to achieve air flow. If the ridgid is acceptable am I right in assuming that unfaced is better than a foil faced product. Space is limited in the attic so the ridgid insulation would help to cut down on my headroom issue.
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