Roof Plane Bracing Nz

Bu617 subfloor and roof bracing in nzs 3604 2011 buildings.

Roof plane bracing nz.

Each ridge line shall have a minimum of two roof braces. I roof plane brace or ii roof space brace or combination of the two. Roof planes less than 6m2 e g. 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. 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. This bulletin describes the bracing for subfloors and roofs of buildings within the scope of nzs 3604 2011 timber framed buildings. 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.

A pair of crossed lumberlok strip brace preferred for ease of installation can be classed as one roof plane brace and shall be installed as detailed in this brochure. Strip brace provides an ideal bracing system for walls or roof plane. The highest end shall be considered to be a ridge line for bracing purposes. For use as bracing or in short lengths as a jointing material.

In a butterfly roof with a central gutter they span between the parapet wall framing and the central gutter in a butterfly roof. Wind and earthquakes can generate significant forces on a building. Summarised from branz guideline newsletter october 2014. 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. Stainless steel strip brace. 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. Additional valleys or hips that also run from top plate to ridge are counted as one additional brace.

There are several options of roof plane braces see figure 2. Bracing roof framing typically consisted of 4 x 2 100 x 50 mm rafters spaced at 18 450 mm centres. Branz structural engineers suggest a rule of thumb that where a lightweight veranda roof. Projects 2 m or less from the building it does not need to have roof bracing.

Dormers porches do not require bracing. There are several options of roof plane braces see figure 2. Roof braces can consist of either. 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.