How Far Apart To Space Trusses For Metal Roof

Once you ve calculated the number of trusses you will need you should purchase the lumber.

How far apart to space trusses for metal roof. If purlins are laying flat on top of the truss 5 or 6 feet is the max on 2x4 s edge up can go to 12 feet or more. So the space between rafters can be greater without reducing the maximum span. Tips on installing purlins for your metal roofing project. In the valleys due to the angle typically produced at the valley and the use of transition flashing it is essential that the.

These standards are as follows. Common spacing for trusses on this type of building is often between 2 and 4 feet but trusses built with advanced designs may allow spacing as great as 8 or 12 feet. For many traditional stick frame builders trusses spaced 8 feet apart seems unnatural but thanks to the ingenuity of modern engineering it is a very common building design. I ve had roof truss manufacturers try to convince me it is impossible to place wood trusses at spacings of over every 4 feet.

Twenty four inches is a common spacing of furring strips for a metal roof. To determine how far apart to set rafters measure the width of the metal panel and then the width of the first hill and valley of the panel. Refer to the installation manual for the proper on center spacing and be sure that the purlin is attached to the roofing truss. Engineers have since determined however that the physical design of a post frame building will allow for standard spacing as great as 12 feet from the center when using high quality metal connector plates and lumber.

A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel. Truss spacing for metal roof. Typical roof truss spacing means that they are usually about 24 inches from centre which means at the centre of one truss there will be a two foot gap or twenty four inch gap until the centre of the next truss. Putting the trusses into place.

The trusses should be a little longer than the exact width to allow for overhang and you will need sufficient trusses to mount across the length. This is traced back to building codes and structural design standards. It all comes down to engineering. With traditional stick frame construction the trusses are usually spaced 2 feet apart.

Typically pole barn style buildings in my area have bays distance between trusses of 5 feet to 12 depending on pitch insulation and height. The same concept holds true for roof trusses. Wider panels allow for greater spacing between rafters. It was perkins who pioneered roof purlins being placed on edge.

With this design change roof trusses could be placed 12 feet apart making it possible for roofs to support the loads to which they would be subjected.