Purlin Spacing

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

Purlin spacing. However engineering determines the optimal spacing between the purlins. You can also contact us by phone at 503 981 6300. Purlins need to follow the sides edges of the roof it is important to note that in addition to the proper spacing and doubling of purlins the valleys it is essential to include purlins along the entire perimeter of the roof. The purlin are ultimately used to fasten the roof steel providing a diaphragm effect along with the siding when properly engineered and installed.

The heavier the expected load is the shorter the distance between the purlins. Purlin spacing is ruled by thetype of roofing material applied as to where it is fastened or installed. For the lighter material such as lightweight aluminum the common spacing length is 4 inches of clear gap. Purlin and girt clips nuts bolts other small parts.

M f 7 00 am 3 30 pm will call hours. Spacing is typically 24 on center in low snow loads and is reduced based upon truss span and snow load. M f 8 00 am 2 00 pm. The typical spacing standards for residential and commercial buildings are about 1 to 2 foot.

Failure to do so can lead to misaligned fastenings causing additional stresses on the fasteners and roof sheeting. For this reason a maximum bridging or bridging to cleat spacing of 20 x purlin depth but no greater than 4000 is recommended. Spacing for purlins on a standard load most designs call for purlin placement at five foot intervals. If the space between posts is greater than 8 feet then brace is needed to avoid buckling.

By the standard the most used placement of purlin span for metal roof is five foot intervals. You will also need to install purlins around penetrations such as plumbing pipes electrical pipes and skylights among others. For 2x4s purlins the posts are spaced in 4 feet distance. For 2x6s purlins the posts are spaced in 6 feet distance.

Numbers 20 and 22 u s. Bridging provides resistance to purlin rotation during the installation of roof and wall sheeting. The spacing of purlins on roofs and girts on wall is usually 4 to 6 ft.