Roof Framing Spacing

Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

Roof framing spacing.

This is denoted two ways a 1 3 or 1 4 pitch in fractions and a 6 12 pitch in inches which means the roof rises 6 inches for each 12 inches of run. This allows the panels to be securely attached to the rafters for maximum stability. Common spacing for trusses on this type of building is often between 2 and 4 feet but trusses built with advanced designs may allow spacing as great as 8 or 12 feet. The same concept holds true for roof trusses.

So the space between rafters can be greater without reducing the maximum span. Rafter spacing depends on the roofing panel size. Pitch is the amount of angle or slope the roof has. Rafter tie or collar tie spacing intervals connection specifications building codes such as the icc s 2012 international building code section 2308 10 roof and ceiling framing typically specify that where rafter ties are used they are required at intervals ranging from 12 to 24 o c.

A framing square is traditionally used for laying out the roof and determining pitch. This is our ultimate roof rafter guide for people designing and building an off grid cabin or tiny home. Discover the pros and cons to multiple roof designs. If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes. Depending on the roof design and the roof rafter spacing.