Standard Distance Between Roof Trusses

Putting the trusses into place.

Standard distance between roof trusses.

I ve had roof truss manufacturers try to convince me it is impossible to place wood trusses at spacings of over every 4 feet. But the tables that follow are a lot more specific. When constructing a roof framework the rule of thumb is that any purlin should have a minimum nominal depth and width of 76 mm or 50 mm and max centre to centre spacing between the purlins ought to be 1 2 m. For example a slope of 6 12 means for every 12 inches of horizontal distance the slope of the roof will rise 6 inches vertically.

This makes the roof ready for decking or sheetrock. Their defense is our engineers will not allow us to. The more timber trusses needed for the project the cheaper the cost of a single truss. You will also incur additional costs because it is much harder to deck and shingle a roof that is 12 12 pitch versus a 4 12 roof.

The rise will be the elevation change over the 12 inches. Most are spaced between 18 26 inches apart. Pitch slope the pitch or slope is the incline of the roof expressed as a fraction describing the rise over the run. It is the vertical distance between the wall and the top of the ridges.

However there are cases where the distance between the trusses is different. Almost all residential trusses use this spacing. The same concept holds true for roof trusses. 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.

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. Truss spacing the distance between trusses. The steeper the roof the more expensive the trusses get because the longer the boards get and the more roof area increases. Rafter is the distance between the ridge or hip of the roof to the wall plate of the external wall.

The standard spacing is 2. The standard roof truss spacing is 2. 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 run or the base number is 12 inches.

These standards are as follows. This is the distance between trusses. Joints between purlins next to one another should be staggered. 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.