Standard Spacing For Roof Trusses

This is most likely the standard size that you will find on pre made roof trusses.

Standard spacing for roof trusses. A 10 8 6 and 4 spacing between trusses has been the standard for most types of construction for years. Spaced sheathing or 1x boards may be reduced slightly. Almost all residential trusses use this spacing. Typical standard the typical standard for the spacing on the roof trusses is 24 inches.

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. Keep in mind that the higher the pitch the steeper the roof. Most are spaced between 18 26 inches apart. Allowable spans for 2x4 top chord trusses using sheathing other than plywood e g.

Putting the trusses into place. The rise will be the elevation change over the 12 inches. 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.

Metal roofs and pole buildings. The run or the base number is 12 inches. Engineers have since determined however that the physical design of a post frame building will allow for standard spacing as great as 12 feet from the center when using high quality metal connector plates and lumber. What dictates the truss design is the roof design snow load typically 20 or 30 psf in most of the u s.

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. These standards are as follows. But in general it doesn t matter if the truss spacing is at 12 16 or 24 inches. 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.

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. Once you ve calculated the number of trusses you will need you should purchase the lumber. I ve had roof truss manufacturers try to convince me it is impossible to place wood trusses at spacings of over every 4 feet. 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.

Their defense is our engineers will not allow us to. The standard roof truss spacing is 2. Spacing a live load deflection limited to l 240 maximum and use lumber properties as follows.