Roof Joist Framing Construction Details

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

Roof joist framing construction details.

End bearing in hanger supported by a beam. Here we have a wood framed gable roof. End bearing with rim board. End bearing with blocking panels.

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. In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes. The function of each component is.

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. The construction of the flat roof is similar to that of the timber upper floor. Let s consider a basic gable wood roof framing design. I joist construction details.

Prescriptive roof consisting of the rafters a ridge board ceiling joists and collar ties. End bearing in hanger supported by i joist s 44kb. Continuing on from part 3. End bearing with rim joist.

Floor beam span tables of residential structural design we will now look at roof rafter and beam design. Joists are placed on edge spaced at 400 600mm centres supported by external and internal load bearing walls. Good installation begins with specification of the correct joist for the application. Intermediate bearing with blocking panels.

The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial.