Roof Truss Spacing Standard

Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g.

Roof truss spacing standard.

This is most likely the standard size that you will find on pre made roof trusses. Almost all residential trusses use this spacing. There is a misconception that spacing trusses every 16 on center is better because it will be strong than the average 2. 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.

The typical standard for the spacing on the roof trusses is 24 inches. Spaced sheathing or 1x boards may be reduced slightly. 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. The standard roof truss spacing is 2.

For instance if you are spacing your trusses 18 inches apart make a mark 18 inches from the edge. 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. While this can be true it is not always accurate unless in some high stress situations. 2x4f 2000psif 1100psie 1 8x10 2x6f 1750 psi f 950 psi f 1900 psi e 1 8x10.

Spacing a live load deflection limited to l 240 maximum and use lumber properties as follows.