Roof Strut Spacing

Struts should be adequately supported over studs in timber walls.

Roof strut spacing.

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. To determine how many trusses to create you will first need to measure both the width and the length of the structure you are building. They should have anti slip blocks where necessary to prevent them sliding horizontally. The same concept holds true for roof trusses.

They are birdsmouthed or halved to fit underpurlins as shown below. Struts are generally more efficient the closer they are to the vertical. So the space between rafters can be greater without reducing the maximum span. Struts must be either vertical perpendicular to the rafters or at an angle to the vertical which does not exceed 35 o.

These standards are as follows.