Roof Joist Framing Construction Details

End bearing with blocking panels.

Roof joist framing construction details.

End bearing with rim joist. Load bearing or primary structure usually constructed in timber in a residential construction. End bearing in hanger on a top plate. Continuing on from part 3.

The function of each component is. Intermediate bearing with blocking panels. In order to maintain the triangle shape there are specific requirements for how to fasten the corners of the triangle together. Let s consider a basic gable wood roof framing design.

I joist construction details. End bearing in hanger supported by i joist s 44kb. The construction of the flat roof is similar to that of the timber upper floor. 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.

In addition to floor and roof framing details this guide includes recommendations for cantilevers and placement of web holes. End bearing in hanger supported by a beam. Prescriptive roof consisting of the rafters a ridge board ceiling joists and collar ties. End bearing with rim board.

Good installation begins with specification of the correct joist for the application. The image below shows a cross section of our simple 12 x 13 house from the joist span tables section of this tutorial. 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. In a rafter roof all of these components are required to provide a stable roof.

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