Quote:
Originally Posted by NH.Solar
If you are going to stripping the roof down to the original sheathing before installing your new metal roof (recommended), consider using 2x4s laid flat and crossways 2' apart on your rafters and then placing 1.5 inch foam board between the purlins. It is a relatively cheap upgrade that will make a huge energy and noise difference
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Just curious, why not leave the old shingles in place and just go over them with metal?
I'd think it would provide a little more insulation and less noise from rail.