Steel Rafter And Purlin Roof Construction

The support system for the roof is comprised of ridgepole and rafters or purlins.

Steel rafter and purlin roof construction.

Boxspan is extremely efficient in roof framing. Purlins are installed horizontally under metal roofs. We do recommend it however. These structural supports run perpendicular across the rafter beams.

An affordable option and easier to lay than shingles tin is the most commonly used type of metal roofing. Let s take a look at the most common types of metal roofs for houses. In architecture or structural engineering or building a purlin or purline is a horizontal structural member in a roof. Do all roofing projects require purlins.

For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. The purpose of purlins. Long spans and light weight make architectural such as cathedral ceilings exposed trusses and roomy lofts more feasible than ever. Boxspan roof frames and rafters are suitable for use with both steel and timber framed homes.

The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. J l neal subject. Rafters to support the metal strap along its whole. Also known as sheeting rails purlins create the roofing members of the secondary framing of a steel building.

They give added support to the roof and also provide a nailing surface for the end panels and drip edge. 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. 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. This design is a lot stronger and more robust way of making a steel shed.

The rafter and wall plate. Purlins and girts are used longitudinally to support the roof sheeting which they were originally designed for. Roof frames rafters roof beams lintels. Purlins are 2 by 4 feet and are installed much like metal roofing.

Whether you are looking to install a metal roof on a shed or a house it s important to know the difference in the various types of metal roofs available. 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. Purlins are an important component in a pre engineered steel structural kit. 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. Note that these are normally only required to trussed rafter roofs and not for traditional purlin and rafter roof construction.