Roof Truss Spacing For Metal Roofing

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.

Roof truss spacing for metal roofing.

Wider panels allow for greater spacing between rafters. Putting the trusses into place. 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. Their defense is our engineers will not allow us to.

Although the standard spacing of roof trusses may be the same as that of rafters with 24 inch spacing being a common option the design of a truss may allow for the use of a lower grade of lumber than would be required for rafters with comparable spacing and span. I ve had roof truss manufacturers try to convince me it is impossible to place wood trusses at spacings of over every 4 feet. These standards are as follows. Align the first metal roofing panel so that it overlaps the edging by 1 2 to 3 4 of an inch and is square to the roof.

A metal roof must also allow for some overlap on each side of the panels which will reduce the effective width of the panel. This is most likely the standard size that you will find on pre made roof trusses. Rafter spacing is based on the width of the metal roofing panels. Truss spacing for metal roof.

Pullout values decrease if the fasteners protrude completely through the purlins. 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. Be sure the larger edge is laid so that the small edge of the next panel will overlap it. Once you ve calculated the number of trusses you will need you should purchase the lumber.

As most building these days are using those pre made trusses on the roof 24 inches become the main size for any roofing construction when it comes to its truss installation. Install the roofing screws vertically along each rib in the panel. Typical standard the typical standard for the spacing on the roof trusses is 24 inches. Typically pole barn style buildings in my area have bays distance between trusses of 5 feet to 12 depending on pitch insulation and height.

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. Kiln dried softwood is recommended for purlins or decking pine fir hemlock and spruce. Place the first screw. It all comes down to engineering.

Metal roofs and pole buildings.