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.
How to install metal roof for backyard patio.
Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps.
Once all of the closure strips are in place begin installing the corrugated roofing panels.
Most metal shingles will be attached to the roof using metal shingle.
After that to make it flush with the roof of the existing house cut the two outer rafters.
To install the closure strips attach the strips to the top of the blocking with galvanized.
In a standing seam roof long single panels run vertically all the way from the eave to the ridge.
If you are installing a metal roof on a structure like a patio cover you may not need this insulation layer.
Make a cutting on one of the sides of the horizontal roof beam on an angle.
You have to do it thoroughly so that the rafters sit flush on it.
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.
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.
Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.
Instead you can just secure the metal roof directly to the wooden beams cut the roofing felt to fit with a utility knife.