Roof Truss Ridge Blocking

Link is external and carried through to more recent versions is the use of blocking panels between roof trusses to connect the trusses to the braced wall panels below if the heel height is greater than 9.

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. And often in a humid environment. 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. 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.

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. Blocking or boundary member. Each block is 2x4 or 2x6 depending on the size of the rafters and is secured to the top plate. Required perimeter blocking on the sheathing attached to each side.

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. Sounds as if you live in either a high wind area or a seismic zone and the roof is your shear diaphragm. A new provision in the 2009 irc. Some may call these wood members blocking and deem them as optional.