Steel Rafter And Purlin Roof Construction

Let s take a look at the most common types of metal roofs for houses.

Steel rafter and purlin roof construction.

They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Roof frames rafters roof beams lintels. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot.

The purpose of purlins. J l neal subject. Purlins support the loads from the roof deck or sheathing and are supported by the principal rafters and or the building walls steel beams etc. For many applications a layer of plywood underneath your metal roofing is an unnecessary expense.

Do all roofing projects require purlins. Purlins and girts are used longitudinally to support the roof sheeting which they were originally designed for. Purlins are an important component in a pre engineered steel structural kit. In architecture or structural engineering or building a purlin or purline is a horizontal structural member in a roof.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. 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. Boxspan roof frames and rafters are suitable for use with both steel and timber framed homes. Long spans and light weight make architectural such as cathedral ceilings exposed trusses and roomy lofts more feasible than ever.

The support system for the roof is comprised of ridgepole and rafters or purlins. An affordable option and easier to lay than shingles tin is the most commonly used type of metal roofing. The rafter and wall plate. Also known as sheeting rails purlins create the roofing members of the secondary framing of a steel building.

We do recommend it however. Building control guidance note purlin and rafter roofs timber sizes and construction 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. Rafters to support the metal strap along its whole.

For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. Note that these are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction. Purlins are installed horizontally under metal roofs. Boxspan is extremely efficient in roof framing.

These structural supports run perpendicular across the rafter beams. This design is a lot stronger and more robust way of making a steel shed.