Typical Roof Framing Members

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.

Typical roof framing members.

Inspectapedia tolerates no conflicts of interest. Most wood used in light frame residential construction takes the form of. And the line length measurement from the roof peak to the building wall is the hypotenuse. Not shown are the hip and valley rafters needed to tie the roof together where the rafters are framed at an angle to each other.

Using span tables as1684 2. The irc and ibc provide prescriptive framed shear wall designs that may be incorporated into the building design to resist lateral loads. Typical nds classifications follow. It is a waterproofing layer made of regular felt stacked above the solid.

Common rafter valley rafter valley jack rafter hip rafter hip jack rafter cripple jack rafter dormer rafter. The members making up the main body of the framework of all roofs are called rafters. A composite decking made of solid materials it resembles real wood and particularly strong and stable for bearing heavy load. They vary in size depending on their length and spacing.

Ridge beams are long rectangular rigid pieces of wood metal or stone which are placed horizontally along the ridge of the roof. In a rafter. Wood structure attic conversion flat roof make a donation the. The rise or height of the roof at its peak is the altitude of the triangle.

Understanding residential timber as1684 framed construction timber framing using as 1684 2 span tables. In the uk a concrete tiled roof would normally have rafters at 600 mm 24 in centers roof battens at 300 mm 12 in centers and ceiling joists at 400 mm 16 in centers. Collar ties rafter ties structural ridge beams. Rafters are sloped beams that run from the roof s ridge to the eaves.

The united states still uses imperial units of measurement and framing members are typically spaced sixteen or twenty four inches apart. Post a question or comment about roof framing support construction specifications practices. Bending for a roof floor or wall surface. The diagram above depicts the cross section of a typical prescriptive roof consisting of the rafters a ridge board ceiling joists and collar ties.

Classified by the species of wood as well as by the nominal size of a member. A horizontal timber or metal resting at the peak of the roof the rafters and trusses are connected to the ridge board for a cohesive framework. Rafters are inclined members spaced from 16 to 48 inches apart. Sep 2 2019 typical roof framing members rafter ridgeboard.

They provide the support for the external roofing material. The run or half the building span is the base of the triangle. Is prescribed as are the connections of these members.