Preventing concrete pollution
Concrete wastewater can be lethal to aquatic life and can land those responsible with a fine, so make sure you keep it out of stormwater.
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Practical how-to articles for builders and designers showing good industry practice and interpretation of the NZ Building Code and standards.
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By Nigel Clarke – 1 December 2009, Build 115
Concrete wastewater can be lethal to aquatic life and can land those responsible with a fine, so make sure you keep it out of stormwater.
By Graeme Beattie – 1 December 2011, Build 127
Lessons from the Canterbury earthquakes mean that all concrete floor slabs must now be reinforced with steel bars or welded mesh with a reasonable degree of ductility.
1 August 2013, Build 137
One of the keys to good-quality cured concrete is correct vibration after it’s poured. This compacts it and consolidates the mix by removing trapped air. But how do you get it right?
By Derek Chisholm – 1 February 2016, Build 152
There are plenty of things to consider when laying a concrete floor slab. Timing, the right amount of water and aftercare are all important.
By Trevor Pringle – 1 June 2014, Build 142
A BRANZ slab-edge insulation detail has been revised, minimising the width of the thermal break.
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.
1 August 2005, Build 89
Concrete shrinks as it sets and will continue to shrink for at least 12 months after placing, depending on drying conditions. About 50% of the shrinkage occurs within the first 4 months.
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.
By Malcolm Cunningham – 1 April 2008, Build 105
Covering a concrete slab too soon can result in the floor covering being damaged. To get the timing right, it helps to understand what the various measurements are telling you.
By Malcolm Cunningham – 1 April 2005, Build 87
Although steel framing in domestic construction has only a small market share, there are signs it may be on the increase. Since steel is a good conductor, builders need to be aware of potential pitfalls, such as thermal bridges and condensation.