Tips on installing purlins for your metal roofing project.
How far apart to space trusses for metal roof.
Truss spacing for metal roof.
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.
Twenty four inches is a common spacing of furring strips for a metal roof.
With traditional stick frame construction the trusses are usually spaced 2 feet apart.
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.
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.
Once you ve calculated the number of trusses you will need you should purchase the lumber.
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.
These standards are as follows.
This is traced back to building codes and structural design standards.
Roof trusses were usually produced on site in the past.
A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel.
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.
The same concept holds true for roof trusses.
Wider panels allow for greater spacing between rafters.
Correctly measure the spacing of furring strips for a metal roof to further decrease condensation.
I ve had roof truss manufacturers try to convince me it is impossible to place wood trusses at spacings of over every 4 feet.
In the valleys due to the angle typically produced at the valley and the use of transition flashing it is essential that the.
It all comes down to engineering.
It was perkins who pioneered roof purlins being placed on edge.
So the space between rafters can be greater without reducing the maximum span.
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.
Most are spaced between 18 26 inches apart.
Refer to the installation manual for the proper on center spacing and be sure that the purlin is attached to the roofing truss.
