Shed Roof Purlins

They give added support to the roof and also provide a nailing surface for the end panels and drip edge.

Shed roof 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. Metal roof purlins are installed horizontally under metal roofs. In a structural steel shed the main portal frames and roof rafters are made from strong steel sections which are welded together and later bolted together. A typical coating thickness is 275 g m.

Use 1 1 4 inch nails to cover the outline of the roof with strips of metal eave flashing also called edging. Purlins and girts are used longitudinally to support the roof sheeting which they were originally designed for. This design is a lot stronger and more robust way of making a steel shed. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

A simple gable shed roof is often built using 2 4 or 2 6 lumber for the rafters and 2 4 for the collar ties. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Purlins are 2 by 4 feet and are installed much like metal roofing.

In structural steel or aluminum construction purlins usually w shapes or channels transfer roof loads to the major structural elements supporting the roof. 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. Once the zinc coating has broken down the steel will begin to rust. Do all roofing projects require purlins.

Place corner pieces where panels will meet bends at the edge of the roofing. Roof zed purlin systems allow for a flexible efficient range of solutions to roofing supports for a wide variety of cladding types. We offer four structural systems. Building trusses on site is easily done for a shed.

Four structural systems are available all of which allow for a flexible and efficient range of solutions to roofing supports for a wide variety of cladding types. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed. The type and spacing of purlins is a design consideration which depends upon the incident roof loads as well as the limiting lengths of sheeting to be used. 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.