New Construction Metal Roof Installed Over Purlins

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.

New construction metal roof installed over purlins.

A standard retrofit sub framing system will not allow a positive attachment to the existing roof purlins. For the convenience of your customers we provide installation guides and metal roofing installation how to videos to support their building projects. 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. The spacing of your purlins depends on the expected snow and wind load.

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. Measuring the outer perimeter existing profile of the roof panel skylight locations and modularity with the new metal roof rib spacing and identifying. 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.

They re also simple to install. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. The actual installation of metal roofs on 1x or 2x purlins has been done for decades on ag and wood framed commerical buildings. Installing a metal roof is a complicated process with many details.

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. Place corner pieces where panels will meet bends at the edge of the roofing. Purlins are 2 by 4 feet and are installed much like metal roofing.