New Construction Metal Roof Installed Over Purlins

A standard retrofit sub framing system will not allow a positive attachment to the existing roof purlins.

New construction metal roof installed over purlins.

They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Measuring the outer perimeter existing profile of the roof panel skylight locations and modularity with the new metal roof rib spacing and identifying. Installing a metal roof is a complicated process with many details. 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.

Metal roof purlins are installed horizontally under metal roofs. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

Its use on residential projects is far less common but has been done a lot especially in rural areas. They re also simple to install. The topic we want to discuss today is the purlin installation. 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.

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. For the convenience of your customers we provide installation guides and metal roofing installation how to videos to support their building projects. The spacing of your purlins depends on the expected snow and wind load. The actual installation of metal roofs on 1x or 2x purlins has been done for decades on ag and wood framed commerical buildings.