Roof Joists Or Rafters

Contractors install rafters side by side and while it has been a tradition to use timber for rafters today s roofing industry employs materials like steel.

Roof joists or rafters.

Rafters are the building components that run diagonally from the wall plate to the apex of a roof structure. While a 2 6 might be nearly double the cost of a 2 4 you can likely space the 2x6s further apart negating the added expense of increasing your lumber width. Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run. Also available for the android os.

This structural support comes in the form of roofing joists ceiling joists rafters or trusses and can be made from a variety of materials including wood metal reinforced concrete etc. Can span up to 13 4. Rafter boards are fastened to the ridge board at the peak and the top plate where they join the wall. However in canada the most common material used in residential framing is wood so that is the material we will discuss here.

Rafters are commonly spaced about 24 inches 61 cm apart. In traditional timber they are nominally 2 inches thick and typically 8 to 10 inches wide. All roof rafters should be identical so follow the same steps to measure the plumb cut tail cut and birdsmouth cut. The number of rafters needed will be determined by the length of your roof.

An syp 2 6 rafter at 24 o c. Span length for 2 6 rafters. Rafters form the foundation for attachment of the roof boards onto which the final roof covering is fixed. The photo shows i joists used as rafters and nailed to a ridgeboard of laminated veneer lumber lvl.

Consult local building codes for snow load capacity and reference the span tables for joists and rafters published by the american wood council awc 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. 2 6 shed roof rafters are enough for nearly any type of shed a homeowner wants to build. In finished space insulation is placed between the rafter boards and drywall or other material is fastened to the face. These i joist rafters are on 24 inch 61 cm centers and support plywood roof sheathing and.

Span calculator for wood joists and rafters also available for the android os.