I’m building a barn – new construction; 5:12 pitch; well ventilated; Atlanta area.
I’d like to use a heavier underlayment than the standard 15 or 30 pound felt, since it will be on the roof for a few weeks before the shingles are applied.
The delay will be caused by waiting for the plumbing and HVAC stacks to be installed; lightning arrestor system to be installed; facia trim to be installed; etc. I know a lot of folks do everything at the same time; but I’m going to wait until everyone is off the roof – before I shingle it.
Looks like Gorillaguard might be one good option. Is there a heavier roll roofing that might do a better job? Thanks.