New Construction Metal Roof Installed Over Purlins

Purlins are 2 by 4 feet and are installed much like metal roofing.

New construction metal roof installed over purlins.

Our metal roof and wall panels qualify for underwriters laboratories ul class a fire rating ul 90 wind uplift rating and class 4 ul impact resistance hail rating. Measuring the outer perimeter existing profile of the roof panel skylight locations and modularity with the new metal roof rib spacing and identifying. They re also simple to install. The spacing of your purlins depends on the expected snow and wind load.

Place corner pieces where panels will meet bends at the edge of the roofing. 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 topic we want to discuss today is the purlin installation. Installing a metal roof is a complicated process with many details.

Its use on residential projects is far less common but has been done a lot especially in rural areas. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Metal roof purlins are installed horizontally under metal roofs.

The actual installation of metal roofs on 1x or 2x purlins has been done for decades on ag and wood framed commerical buildings. 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. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. For the convenience of your customers we provide installation guides and metal roofing installation how to videos to support their building projects.