Roof Joist Framing Construction Details

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. I joists in floor and roof applications. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.

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Load bearing or primary structure usually constructed in timber in a residential construction.

Roof joist framing construction details.

End bearing with rim joist. Prescriptive roof consisting of the rafters a ridge board ceiling joists and collar ties. Let s consider a basic gable wood roof framing design. End bearing in hanger supported by a beam.

The construction of the flat roof is similar to that of the timber upper floor. 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. End bearing in hanger on a top plate. The function of each component is.

End bearing with rim board. Continuing on from part 3. In a rafter roof all of these components are required to provide a stable roof. Floor beam span tables of residential structural design we will now look at roof rafter and beam design.

Good installation begins with specification of the correct joist for the application. In order to maintain the triangle shape there are specific requirements for how to fasten the corners of the triangle together. End bearing with blocking panels. End bearing in hanger supported by i joist s 44kb.

I joist construction details. Intermediate bearing with blocking panels. Here we have a wood framed gable roof. In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes.

Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls.

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