Wood Framing Roof Rafters

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

Wood framing roof rafters.

With the rafters in place the gable end framing uses vertical studs or blocking positioned directly over the wall studs and supported by the end top plates. The rafters carry the applied loads to the exterior walls. Rafter spans can be extended slightly beyond what the rafter tables suggest when there is a cantelever extending beyond the supporting wall. Rafters act more like the top chord of a roof truss than as a roof joist.

Framing a roof is the last step in framing new construction. Ceiling joist span use this table to determine the maximum lengths of ceiling joists based on species of lumber joist spacing and joist size. After the sheathing is installed hanging or fly rafters are then installed. While most home builders will outsource the construction of roofing trusses the rafter supports of the roof itself learning to frame a roof yourself is one of the true arts of carpentry and a basic primer is covered below.

Also available for the android os. Rafters typically use larger wood beams and do not have any sort of framework other than the beams themselves. Depending on the roof design and the roof rafter spacing. Along the top center of the house there is a beam to which are attached the rafters.

As we discussed in exterior house designsthere are many different house roof types. 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. Subtract this measurement from the width of your building. 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.

A rafter beam is usually larger than a 2 4 large homes may have rafters that are 2 12 or more. The ridge board is non load bearing and merely provides the point of connection for the opposing rafters and is only a nominal 1 thick. Similarly hip and valley rafters provide the point of connection for roof rafters framed at angles. A truss on the other hand is only made up of 2x4s and is often pre fabricated in a factory.

Here we have a wood framed gable roof. Each rafter is in turn fastened to the top of the exterior structural walls. Span calculator for wood joists and rafters also available for the android os. They are notched to fit around the gable end rafters.