Tying up those slabs
Another change since the Canterbury earthquakes is that all reinforcing in slabs on the ground must now be tied into the foundation wall reinforcing.
Foundations
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Edge insulation of slabs
By Ian Cox-Smith – 1 December 2016, Build 157
Modelling of concrete floor slabs at BRANZ has provided insights into how to optimise the effectiveness of exterior perimeter edge insulation.
Retrofitting timber house foundations on sloping sites
By Roger Shelton – 1 April 2021, Build 183
Houses built on sloping sites have performed poorly in recent earthquakes. BRANZ experiments have shown how to retrofit pre-1960s timber house foundations to significantly improve seismic performance.
The rise of liquefaction rules
By Maria Grace – 1 August 2022, Build 191
After the Canterbury earthquakes, regulations governing foundations changed. Initially only for the Canterbury region, they were later rolled out around New Zealand. What are the changes and what do they mean?
Formwork
By Des Molloy – 1 October 2010, Build 120
Many builders have had a concrete and formwork failure that they would rather forget. It’s an area of construction where listening to the wisdom of experienced tradespeople is vital, but the following pointers may also help.
Liquefaction lessons
By Kiran Saligame – 1 April 2020, Build 177
Following a 2-year transition period, Acceptable Solution B1/AS1 will no longer be used for foundations on land prone to liquefaction. Foundations will be consented as a Verification Method or Alternative Solution.
Hillside foundations get a shake-up
By Dael Climo – 1 April 2020, Build 177
It was shake, rattle and roll on a hill near Wellington when BRANZ put research into house foundations to a practical test.
At the junction
By Ann Galloway – 1 August 2016, Build 155
Renovations or extensions can often mean a new slab is laid abutting an old one. There’s plenty to consider before starting work to ensure the junction is weathertight, strong and Building Code compliant.
Stepped foundation walls
By Alide Elkink – 1 August 2017, Build 161
Foundation walls provide support to the external walls of buildings, and on flat sites, their design and construction is quite straightforward. When the site has uneven or sloping ground, however, requirements are more complex.
Perimeter insulation
By Ian Cox-Smith – 1 August 2014, Build 143
To help improve our homes, the recently released BRANZ House Insulation Guide now includes thermal performance values for more insulated slab-on-ground flooring options and waffle pod systems.
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Issues (32)
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