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It is vertical 2x4 (I think...I'd have to go up to be sure, but I think they're 2x4). The insulation is batting attached under the roof deck, not in the ceiling**. The roof deck is either OSB or plywood. Again, I would have to get into the attic and try to peer past the batting to see it.

Just remembered...I have photos from the construction. It is OSB. Then felt, then horizontal pieces to which the tiles attach. That part is pretty standard.

Yes, the tiles last probably 50 years, but the underlayment (I'm told) can only be expected to last maybe 20 years.

I can't see any way to evaluate the felt underneath without removing the tiles (which is probably most of the cost of reroofing...removing the tiles and putting them back).


**In Arizona it is the best way to avoid superheated attics and higher utility bills.
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