NE LA. across from the fiberglass Charolais bull | I have never done a gambrel roof but did my house 35 years ago. I shucked off the old shingles and re-nailed the pops. Doing it this way let me re-felt the ship lap decking with 30# felt. I used 28 gauge 5V crimp galvalume nailed flat to the deck. Nailing directly to the deck has let it come through unscathed two bad hail storms that dinged up other metal roofs nailed to lathing.
Installation is easy using screws or gasketed ring shank nails.
Hope this helps. Gil |