Branz structural engineers suggest a rule of thumb that where a lightweight veranda roof.
Roof plane bracing nz.
There must be at least one roof plane brace in each roof plane.
There are several options of roof plane braces see figure 2.
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.
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.
For use as bracing or in short lengths as a jointing material.
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.
Stainless steel strip brace.
In a butterfly roof with a central gutter they span between the parapet wall framing and the central gutter in a butterfly roof.
Dormers porches do not require bracing.
Roof planes less than 6m2 e g.
Summarised from branz guideline newsletter october 2014.
The bracing described in this brochure covers both framed roofs and fully trussed roofs.
There are several options of roof plane braces see figure 2.
Bracing demand must be calculated and sufficient bracing incorporated into a building so that the structure can withstand these forces.
Additional valleys or hips that also run from top plate to ridge are counted as one additional brace.
Each ridge line shall have a minimum of two roof braces.
Bracing roof framing typically consisted of 4 x 2 100 x 50 mm rafters spaced at 18 450 mm centres.
Bracing demand must be calculated and sufficient bracing incorporated into a building so that the structure can withstand these forces.
Wind and earthquakes can generate significant forces on a building.
Roof braces can consist of either.
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.
Bu617 subfloor and roof bracing in nzs 3604 2011 buildings.
The highest end shall be considered to be a ridge line for bracing purposes.
Strip brace provides an ideal bracing system for walls or roof plane.
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.
Additional valleys or hips that also run from top plate to ridge are counted as one additional brace.
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.
Projects 2 m or less from the building it does not need to have roof bracing.
