Roof Truss Spacing Standard

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.

Roof truss spacing standard.

There is a misconception that spacing trusses every 16 on center is better because it will be strong than the average 2. For instance if you are spacing your trusses 18 inches apart make a mark 18 inches from the edge. This is most likely the standard size that you will find on pre made roof trusses. Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g.

Spaced sheathing or 1x boards may be reduced slightly. Spacing a live load deflection limited to l 240 maximum and use lumber properties as follows. Almost all residential trusses use this spacing. The standard roof truss spacing is 2.

2x4f 2000psif 1100psie 1 8x10 2x6f 1750 psi f 950 psi f 1900 psi e 1 8x10. 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. 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. After the braces are in place you will mark the distance from the edge of the building to where you would like to attach your first truss.

These standards are as follows.