The pitch of the roof determines the roofing material you can use.
Roof framing notes.
Refer to building elevations roof plan for existing new final roof configuration.
Refer to the figure as you study the terms discussed in the next paragraphs.
Ridge beam sits below the rafters.
Span is the horizontal distance between the outside top plates or the base of two abutting right triangles.
Unit of run is a fixed unit of measure always 12 inches for the common rafter.
Rafters act more like the top chord of a roof truss than as a roof joist.
Framers stick building a hip roof you can learn a great deal about roof framing by understanding the concepts of framing a gable or shed roof.
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Roof framing is the next building component found within the load path.
Roof sheathing shall be 15 32 apa rated sheathing with a panel index of 24 0.
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.
Typical floor sheathing shall be 23 32 apa sturd i floor with a panel index of 40 20.
There are several roof types.
Asphalt shingle can be installed on a pitch of 2 over 12 or greater.
It must meet the local codes for thickness at least 3 8 which is also based on the rafter or truss spacing.
In order to maintain the triangle shape there are specific requirements for how to fasten the corners of the triangle together.
The point at which all the raftersare attached to.
Roof framing plan notes.
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.
Similarly hip and valley rafters provide the point of connection for roof rafters framed at angles.
In field unless noted otherwise on plans.
The gable roof hip roof gambrel roof flat roof shed roof mansard roof and many more custom roof types.
Plywood or osb is the most common materials used for the roof sheathing.
Transfers the loadof the roof through the raftersto walls below.
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Nail to framing with 8d common nails at 6 o c.
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.
Roof framing depends on the type of roof you want to build.
