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What is the purpose of AS 1684.4 - 2010?
To specify requirements for the construction of timber framed class 1 and 10 buildings that have:
- N1 and N2 wind classification (table 1.1)
- No more than TWO stories
- No more than 12m in width excluding eaves
- Max wall height of 2.7m
- Max rafter overhang of 750mm
- Max roof pitch of 30 degrees
- Max rafter/truss spacing 900m
- Max spacing of bracing elements 9m
- specifications within buildings mass tables
What is stress grading?
Strength classification for structural timber and refers to how much load a piece of timber can handle.
Define spacing, single span, continuous span, load bearing, dead load, live load, nominal fixing.
Spacing - centre to centre distance between structural members.
Single Span - The span of a member supported at or near each end without intermediate supports.
Continuous Span - The span of a member supported at or near each end with intermediate supports so that no span is greater than twice another.
Load Bearing - The purpose of a structural member to transfer loads imposed on a building to the foundations.
Dead Load - Load of the structure itself.
Live Load - Load from things that can be moved in and out of the structure.
Nominal Fixing - Normally accepted fixing requirements.
Look up timber sizes in AS1684.4 to illustrate that you understand how to use the tables.
Section 3 SUBSTRUCTURE
What are the requirements for building stair construction?
NCC 188.8.131.52 Stair Construction
- Each flight must have between 2 and 18 risers
- Risers and treads must be constant throughout each flight.
- Quarter and half landing dimensions can vary from straight stairs but must be consistent themselves.
- No opening in risers of balustrades can be more than 125mm
- Treads must be slip resistant
What are the requirements for balustrades and balconies?
NCC 3.9.2 Balustrades and Handrails
- Minimum height 865mm from floor of landing to a stair or stair nosing.
- Min height of 1m above any access path, balcony or landing.
- Openings in balustrades cannot exceed 125mm.
- Wire balustrades must meet requirements for NCC Table 184.108.40.206 and 220.127.116.11.
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