Roof Truss Ridge Blocking

Rafter blocking is an essential part of the roof framing process in that the blocks provide a stop for ceiling insulation and a continuous surface for the roof sheathing to be edge nailed to.

Roof truss ridge blocking.

In my experience traveling across the country observing wood framed construction it was apparent that east of the rocky mountains structural wood members in line with supporting walls between roof framing cease to be installed. For trusses with heel heights less than 15 this blocking can be made of solid sawn dimensional lumber as shown in figure 1a. A continuous band rim or header joist or roof truss parallel to the braced wall panels shall be permitted to replace the blocking required by this section. Inspector want ridge blocking on truss roof.

A complex roof with more than four hips and with valleys due to wall jogs means that there are usually cases where trusses don t conveniently come to a hip and ridge line junction. Some may call these wood members blocking and deem them as optional. The pics show a view of such a roof a plan view of trusses and blocking at and near the intersect and a 3d model of the three pieces of 2x blocking that fills in for the panel nailing. And often in a humid environment.

Required perimeter blocking on the sheathing attached to each side. A new provision in the 2009 irc. Where required by this section blocking between rafters or roof trusses shall be attached to top plates of braced wall panels and to rafters and roof trusses in accordance with table r602 3 1. Blocking or boundary member.