Metal Roof Purlins Or Sheathing

In order to avoid a hump at the transition from two layers of materials to one the notation on the building plans advises to lower the roof purlins in these areas by 7 16.

Metal roof purlins or sheathing.

Purlins are non pressure treated 1 x 4 x 12 lumber that is installed on to the roof in a specific layout pattern and screw pattern. Use screws with solid sheathing. Work up from the initial row starting at the lower corner in a diagonal pattern staggering the shingles to prevent gaps. For best results with aluminum panels use 300.

Metal roofing panels rated for architectural use attached to purlins horizontal pieces of wood or metal fastened to roofing trusses are structurally sound when installed according to your roofing manufacturer s instructions and local building codes. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. Roof pitch the metal roofing panels shown in this manual require a mini. The difference in strength for wind and snow load are my concerns on whether to use purlins or sheathing versus cost.

I am doing an exsposed fastener metal roof on my own place. Then the top of all your purlins once osb under metal roof panels is placed will be in the same plane and the roof steel will lay flat. Metal roofing roof panels the home depot store finder. Lay the starter row of metal shingles at the drip edge and affix to the roof with metal roofing nails.

But i am convinced after inspecting thousands of asphalt shingled roofs metal is the way to go. Purlins girts and roof deck. Metal roofing is also available in the form of shingles.