Roof Joist Framing Construction Details

Here we have a wood framed gable roof.

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. Continuing on from part 3. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.

Load bearing or primary structure usually constructed in timber in a residential construction. Good installation begins with specification of the correct joist for the application. End bearing in hanger supported by a beam. The construction of the flat roof is similar to that of the timber upper floor.

Floor beam span tables of residential structural design we will now look at roof rafter and beam design. Let s consider a basic gable wood roof framing design. Intermediate bearing with blocking panels. I joist construction details.

In order to maintain the triangle shape there are specific requirements for how to fasten the corners of the triangle together. End bearing with rim joist. In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes. Prescriptive roof consisting of the rafters a ridge board ceiling joists and collar ties.

End bearing in hanger on a top plate. End bearing in hanger supported by i joist s 44kb. In a rafter roof all of these components are required to provide a stable roof. I joists in floor and roof applications.

The function of each component is.