Purlin Spacing For Steel Roofing

We do recommend it however.

Purlin spacing for steel roofing. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. Fyi we run purlins on 3 5 feet on center depending on size of purlin. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed. Purlin spacing is dependent on profile of the metal and gauge plus snow and wind load plus what the rafters are designed to carry.

Spacing is typically 24 on center in low snow loads and is reduced based upon truss span and snow load. Without a set of blueprints with a pe s seal you have no option but to follow the inspectors gig. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. Screw line spacing for metal roofing over metal purlins.

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. However engineering determines the optimal spacing between the purlins. Purlin spacing for metal roofing. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to.

For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet. For 2x6s purlins the posts are spaced in 6 feet distance. This will depend upon the type of panel that is used and the thickness of the steel. If the space between posts is greater than 8 feet then brace is needed to avoid buckling.

Do all roofing projects require purlins. The heavier the expected load is the shorter the distance between the purlins. Spacing for purlins on a standard load most designs call for purlin placement at five foot intervals. For 2x4s purlins the posts are spaced in 4 feet distance.

The cos of the purlin spacing is because the load on the purlins is vertical and the purlin spacing is with the run of the roof. Once the purlin spacing is determined then the metal roofing panels are typically attached to every line of purlins. An engineer will use a load chart in order to determine the spacing between metal purlins.