Metal Roof Purlin

Metal roof purlins are installed horizontally under metal roofs.

Metal roof purlin.

Purlins are installed horizontally under metal roofs. 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. The width of metal panels will determine the rafter spacing. Purlins are an important component in a pre engineered steel structural kit.

They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. 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. We do recommend it however.

Available in cee or zee shape red oxide primed or galvanized 16 14 or 12 gauge sizes from 4 up to 12 flange widths of 1 1 2 up to 4 cut to your specified lengths hole punching available load tables available for all material. The metal roof purlins spacing must be done correctly within narrow tolerances. Purlin plates are beams which support the mid span of rafters and are supported by posts. There is a chance of damaging roofing sheets if you are failed to do so.

They are installed on top of the roof rafters with a felt underlayment or vapor barrier installed on top. A purlin plate in wood construction is also called an arcade plate in european english under purlin and principal purlin. Also known as sheeting rails purlins create the roofing members of the secondary framing of a steel building. The term plate means a major horizontal supporting timber.

The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Engineered purlin metal mart offers a complete line of engineered purlin material. Do all roofing projects require purlins. By supporting the rafters they allow longer spans than the rafters alone.

They give added support to the roof and also provide a nailing surface for the end panels and drip edge. Purlins are 2 by 4 feet and are installed much like metal roofing. Metal building roof purlins provide three structural functions. These structural supports run perpendicular across the rafter beams.