How Far To Space Purlins Steel Roof

For heavier material such as gage steel the metal roof purlins spacing length could go up to 4 feet.

How far to space purlins steel roof.

How to install metal roof purlins. Fyi we run purlins on 3 5 feet on center depending on size of purlin. If the space between posts is greater than 8 feet then brace is needed to avoid buckling. Take your square footage and multiply it by 80.

80 screws for each roofing square. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot. Snap a chalk line horizontally across the roof two feet down from the top. Measure the section of the roof from the fascia to the peak and divide this by two which is the two foot spacing of the wood nailers.

For 2x4s purlins the posts are spaced in 4 feet distance. The purpose of the purlins is to provide a solid foundation for the metal roofing panels and trim to be screwed to. Purlin spacing is dependent on profile of the metal and gauge plus snow and wind load plus what the rafters are designed to carry. For 2x6s purlins the posts are spaced in 6 feet distance.

Rather than having 2 4 purlins every 12 it would make far more sense economically to use 2 6 purlins every 24. 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. Purlin spacing for metal roofing. A roofing square is 100 square feet.

Run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed for installation. Less expensive 1 3rd less board footage of lumber fewer pieces to handle fewer joist hangers to have to attach and only one half as many screws to attach the roof steel. Spacing is typically 24 on center in low snow loads and is reduced based upon truss span and snow load. In this example the section of roof is 20 feet wide and 14.

Lay the first purlin at the ridge. Without a set of blueprints with a pe s seal you have no option but to follow the inspectors gig. By the standard the most used placement of purlin span for metal roof is five foot intervals. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed.