What is the standard spacing for roof trusses?

What is the standard spacing for roof trusses?

Roof trusses should be 24” apart, on center. Trusses are allowed to be closer together, at either 12” or 16” on center, but building codes allow for 24” on center spacing without using heavier duty fasteners for truss to wall connections.

How far apart are purlins?

The purlin are ultimately used to fasten the roof steel providing a diaphragm effect, along with the siding, when properly engineered and installed. Spacing is typically 24″ on center in low snow loads and is reduced based upon truss span and snow load.

What is the spacing on roof rafters?

But they do tend to space rafters in one of several industry-standard increments, typically either 12, 16 or 24 inches apart. These spacing intervals are measured “on center,” meaning that the measurement is taken from the center of one rafter’s horizontal surface to the center of the next rafter.

What is purlin spacing?

The spacing of purlins on roofs and girts on wall is usually 4 to 6 ft. Numbers 20 and 22, U.S. Standard gage, are generally used for roofing; No. 24 for siding. This also serves to decrease the overhang of the roof sheeting where it extends beyond the purlin to the ridge.

What is the spacing for roof rafters?

What is the spacing of girts and purlins?

The spacing of purlins on roofs and girts on wall is usually 4 to 6 ft. Numbers 20 and 22, U.S. Standard gage, are generally used for roofing; No. 24 for siding.

How to install purlins?

Run a tape measure from end to end along the rafters of the roof to determine how many purlins will be needed for installation.

Snap a chalk line horizontally across the roof two feet down from the top.

Set the second purlin horizontally right next to the first and install it the same way. Continue down the row until the first row is complete.

Move two feet down the roof and snap a horizontal chalk line. Install the second row of purlins just like the first,cutting the end piece to fit.

How should my roof trusses be spaced?

Roof trusses should be 24″ apart, on center. Trusses are allowed to be closer together, at either 12″ or 16″ on center, but building codes allow for 24″ on center spacing without using heavier duty fasteners for truss to wall connections. If you live in a hurricane-prone area, you might consider moving your trusses to 16″ on center.

Generally, the first girt is at 7 foot 4 inches and girts above that are usually at 5 feet (depending on design specifications). Depending on wind loading, there may also be a girt below 7’4″. Purlins are typically spaced five feet apart, but with high roof loads this interval will narrow accordingly.