Roof Plane Bracing Nz

There must be at least one roof plane brace in each roof plane.

Roof plane bracing nz.

Additional valleys or hips that also run from top plate to ridge are counted as one additional brace. Roof bracing is unlikely to have any effect if veranda roofs up to 2 m wide are securely fixed to or restrained by the structure of the building. The highest end shall be considered to be a ridge line for bracing purposes. The trusses will require lateral support at right angles to the length of the trusses at the high end and the roof will also require roof plane bracing and or roof space braces.

Roof braces can consist of either. Projects 2 m or less from the building it does not need to have roof bracing. Stainless steel strip brace. For use as bracing or in short lengths as a jointing material.

Bracing demand must be calculated and sufficient bracing incorporated into a building so that the structure can withstand these forces. Roof bracing requirements roof type one roof brace per 50m2 of roof area see rule 8 for minimum requirements one roof brace per 25m2 of roof area see rule 8 for minimum requirements 1. This bulletin describes the bracing for subfloors and roofs of buildings within the scope of nzs 3604 2011 timber framed buildings. There are several options of roof plane braces see figure 2.

The bracing described in this brochure covers both framed roofs and fully trussed roofs. Bracing demand must be calculated and sufficient bracing incorporated into a building so that the structure can withstand these forces. Roof planes less than 6m2 e g. Each ridge line shall have a minimum of two roof braces.

Wind and earthquakes can generate significant forces on a building. Branz structural engineers suggest a rule of thumb that where a lightweight veranda roof. There must be a minimum of two there is an error in nzs 3604 2011 which requires three that run from top plate to ridge. Bracing roof framing typically consisted of 4 x 2 100 x 50 mm rafters spaced at 18 450 mm centres.

Summarised from branz guideline newsletter october 2014. Bu617 subfloor and roof bracing in nzs 3604 2011 buildings. In a butterfly roof with a central gutter they span between the parapet wall framing and the central gutter in a butterfly roof. Additional valleys or hips that also run from top plate to ridge are counted as one additional brace.

I roof plane brace or ii roof space brace or combination of the two. In a mono pitch roof they span between the front wall parapet framing and the rear wall framing. Strip brace provides an ideal bracing system for walls or roof plane. Dormers porches do not require bracing.