You have to do it thoroughly so that the rafters sit flush on it.
How to install metal roof for backyard patio.
Once all of the closure strips are in place begin installing the corrugated roofing panels.
Attach the horizontal beam by using a nail gun.
Make a cutting on one of the sides of the horizontal roof beam on an angle.
Most metal shingles will be attached to the roof using metal shingle.
If you are installing a metal roof on a structure like a patio cover you may not need this insulation layer.
To install the closure strips attach the strips to the top of the blocking with galvanized.
Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.
As for the corrugated metal roofing i chose rubber washer metal into wood screws with bolt heads and used a magnetized drill adapted socket to put them in.
That type of screw goes into into every valley at the top and bottom ends of the panels and every other valley throughout the rest of the roof into the 1 x 6 boards placed 24 on center.
The roofing felt will lay horizontally along the plywood deck of the roof.
How to install a patio roof using corrugated metal panels installing closure strips.
Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.
If you want to install steel over asphalt your best choice for installing metal roofing is to use a steel shingle system like the one shown instead of the more common and more expensive standing seam steel.