Roof Framing Notes

In order to maintain the triangle shape there are specific requirements for how to fasten the corners of the triangle together.

Roof framing notes.

Ridge beam sits below the rafters. The roof framing must support the roof decking and sheathing and resist loads applied to the sheathing and transfer loads vertically to support walls or frames. A ridge board is a horizontal member of the roof frame. Roof framing depends on the type of roof you want to build.

Refer to the figure as you study the terms discussed in the next paragraphs. Rafters act more like the top chord of a roof truss than as a roof joist. Span is the horizontal distance between the outside top plates or the base of two abutting right triangles. The point at which all the raftersare attached to.

Plywood or osb is the most common materials used for the roof sheathing. Nail to framing with 8d common nails at 6 o c. Roof framing is the next building component found within the load path. Features associated with basic roof framing terms are shown in figure 2 2.

Similarly hip and valley rafters provide the point of connection for roof rafters framed at angles. Asphalt shingle can be installed on a pitch of 2 over 12 or greater. Roof sheathing shall be 15 32 apa rated sheathing with a panel index of 24 0. Unit of run is a fixed unit of measure always 12 inches for the common rafter.

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. Refer to building elevations roof plan for existing new final roof configuration. Roof framing plan notes. At panel edges and 12 o c.

Typical floor sheathing shall be 23 32 apa sturd i floor with a panel index of 40 20. The pitch of the roof determines the roofing material you can use. Transfers the loadof the roof through the raftersto walls below. It must meet the local codes for thickness at least 3 8 which is also based on the rafter or truss spacing.

S2 20 roof framing plan dd package 04 08 11 5 s5 03 6 permit 04 22 11 revisions 06 06 11 3 steel stud details 7 permit review 06 27 11 s2 21 ceiling soffit framing plan permit review 07 08 11 2 philadelphia pa 19107 aramark corporation innovative dining solutions 4535 w. In field unless noted otherwise on plans. Russell road suite 12 las vegas nv 89118 tel 702 388 7755. Meeting current irc roof framing requirements means builders are really constructing very simple triangles using the rafters and ceiling joists because triangles are known to be the most stable shape.