Purlin Spacing For Metal Roofing

Do all roofing projects require purlins.

Purlin spacing for metal roofing.

Purlin spacing for metal roofing the country inspector upon approving the plans seems to have written in per manufacturers specs regarding 2x4 purlins on 16 centers. This will depend upon the type of panel that is used and the thickness of the steel. The roofing is manufactured in panels that. Tin roofing also known as metal roofing is considered more durable than composition or wood shingles.

Panel basics corrugated metal panels often called tin because in the past such panels were sometimes made of tin are typically steel or aluminum sheets that are used as a roofing material. The metal roof purlins spacing must be done correctly within narrow tolerances. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Once the purlin spacing is determined then the metal roofing panels are typically attached to every line of purlins.

In structural steel or aluminum construction p urlins usually w shapes or channels transfer roof loads to the major structural elements supporting the roof. There is a chance of damaging roofing sheets if you are failed to do so. Screw line spacing for metal roofing over metal purlins. An engineer will use a load chart in order to determine the spacing between metal purlins.

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. Installing wood stripping under a tin roof. The building was built 24 on center. We do recommend it however.

However the screw placement diagrams commonly are based on the on center spacing center to center of the purlin rather than the gap between purlins to determine the length and spacing of the screws needed to prevent wind blowoff for various design wind speeds so pay close attention to that difference. 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 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. The wider the roofing panels the greater spacing distance you should put.