On Sep 7, 4:01*pm, Notat Home wrote:
Why do you need roofing felt under the shingles?

Temporary weatherproofing mainly, and it affords some small degree of
added protection as it would help divert any water over the seams of
the plywood.

I'm considering putting a raised seam metal roof on my garage, after
tearing of the shingles. *Do I need new felt under the metal roof?

Most manufacturers require roofing underlayment. Omitting it can void
the warranty.

R