Steel Rafter And Purlin Roof Construction

Purlins are installed horizontally under metal roofs.

Steel rafter and purlin roof construction.

We do recommend it however. An affordable option and easier to lay than shingles tin is the most commonly used type of metal roofing. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top.

For more detailed information on re roofing applications consult fabral tech nical bulletin 721 re roofing with metal. They give added support to the roof and also provide a nailing surface for the end panels and drip edge. By supporting the rafters they allow longer spans than the rafters alone. The metal roof purlins spacing must be done correctly within narrow tolerances.

The width of metal panels will determine the rafter spacing. This will provide a solid framework for attaching the metal panels. They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. Purlin plates in wooden construction.

Contact fabral for additional information. Also known as sheeting rails purlins create the roofing members of the secondary framing of a steel building. 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 2 by 4 feet and are installed much like metal roofing.

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 give added support to the roof and also provide a nailing surface for the end panels and drip edge. Metal building roof purlins provide three structural functions. The term plate means a major horizontal supporting timber.

Metal roof purlins are installed horizontally under metal roofs. 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. First the purlins support the roof. Do all roofing projects require purlins.

There is a chance of damaging roofing sheets if you are failed to do so. The purpose of purlins. The plywood covers the entire roof and is solidly attached to the rafters providing a sturdy base for both insulation and metal roofing panels. Let s take a look at the most common types of metal roofs for houses.

The wider the roofing panels the greater spacing distance you should put. Purlins are 2 by 4 feet and are installed much like metal roofing. A purlin plate in wood construction is also called an arcade plate in european english under purlin and principal purlin. The use of purlins as opposed to closely spaced rafters is common in pre engineered metal building systems and both the ancient post and beam and newer pole building timber frame construction.

Purlin plates are beams which support the mid span of rafters and are supported by posts. Purlins should be fastened through the decking and into the rafters.