Metal Roof Directly On Purlins

We do recommend it however.

Metal roof directly on purlins.

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. Do all roofing projects require purlins. There is a chance of damaging roofing sheets if you are failed to do so. There are two ways to do this put in firring nailing though nails are not used any more for this strips or purlins in steel frame construction on the roof to support it or place the metal roofing directly on a flat surface like foam insulation board or the roof sheathing with roof water barrier in the correct position in the layer.

You have to allow some overlap section on each side of. Place corner pieces where panels will meet bends at the edge of the roofing. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

If there are gutters installed on the eaves the eave flashing should be installed to overhang the lip of the gutter by about 1 2 inch. The metal roof purlins spacing must be done correctly within narrow tolerances. This is by far the most common way to install a metal roof. Purlins are 2 by 4 feet and are installed much like metal roofing.

In a barn shop or other outbuilding you can attach your metal roof directly to the purlins. 3 install 1x4 purlins down over the shingles before installing the metal roof the third way to install a metal roof over shingles is by applying 1x4 purlins over the shingle roof. As long as the plywood under the shingle roof is in good condition this way can provide many benefits. The wider the roofing panels the greater spacing distance you should put.

They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging. Moisture can collect on the inside of your metal roof whenever warm moist air inside your building meets the cold metal of your roof.