How to waterproof the top course of shingles on a shed roof
I’m about to put an asphalt roof on a single-pitched building I’ve just built. I’ve attached a photo for clarity (not my build unfortunately).
What is the best way to shingle or flash this style of roof to prevent water intrusion at the top course of shingles? I have taken great care so far to properly waterproof the rest of this build, and I am surprised to find only amateurish results on google on how to deal with the top edge of a shed-style roof.
One solution would be to nail a piece of metal flashing with a 90-degree bend, but the flashing itself will then have exposed nails which seems less than ideal. I don’t trust sealants to offer long-term waterproofing, so simply sealing the nail heads doesn’t pass muster in my mind.
I am not a pro builder and any advice on how to finish this detail is appreciated! Thank you!
GBA Detail Library
A collection of one thousand construction details organized by climate and house part