We look at options for floors, walls, roofing and joinery with an emphasis on ensuring your home stays weathertight.
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The type of floor put into a house depends on the design and construction methods. The common types are:
The advantage of a house built with a concrete pad is that the concrete floor can act as a thermal heat storage mass which, if used in conjunction with insulation in the walls and ceilings, keeps that stored heat inside.
In all cases the floor should be insulated.
Your designer and builder should know the current timber treatment requirements for the various areas in a house. But if you are doing some alterations and purchasing the timber yourself, make sure you buy the timber treated to the right standard for the situation. For example, framing for enclosed decks and balconies requires a higher treatment level than other wall framing.
You can find out about timber durability requirements in Paragraph 3.2 ‘Timber’ of Acceptable Solution B2/AS1, supporting Clause B2 ‘Durability’ of the Building Code. This Acceptable Solution requires designers and builders to follow the requirements in NZS 3602:2003 Timber and Wood-based Products for use in buildings.
NZS 3602 requires treatment and identification of timber to be in accordance with a further New Zealand Standard - NZS 3640:2003 Chemical Preservation of Round and Sawn Timber. This Standard clarifies the identification system of the types of timber treatment by use of colour, branding and/or chemical testing.
These standards can be purchased from Standards New Zealand, call 0800 782 632 or go to www.standards.co.nz.
Common options for exterior cladding include:
Whichever cladding you choose, it is only going to be effective in doing its job, which is to keep water out of your home, if it is appropriate for the situation and used correctly. Your designer will be able to give you advice on the best claddings to use in your situation. This decision will depend on many factors but the Acceptable Solution for weathertightness limits the use of some claddings in some circumstances. It also specifies the use of a drainage cavity where the risk score for a building reaches certain limits. Manufacturers also place limits on where and how their materials should be used.
Problems occur when claddings are used outside their specifications or have been installed incorrectly.
Try to limit the range of different claddings used on one particular building, so reducing the number of unnecessary cladding joints. Joints in cladding systems are its weakest part – increasing the risk of leaking.
Common types of roofing include:
Complicated roof designs, i.e. those with many roof planes at different pitches and levels, require special care when being built. All the junctions need to be properly flashed, and, as flashings don’t tend to last as long as the roof, they will require more maintenance during the life of the roof. This may not be easy or cheap.
Anything that penetrates the roof, such as pipes or flues, need special care to ensure weathertightness.
There are other technical considerations, for example, allowing for heat expansion and contraction, and making sure the pitch meets the various metal roofing profiles in the Acceptable Solutions to the Building Code. You should be able to rely on your architect or designer to advise you – choose your designer carefully.
To keep maintenance of the roof to a minimum:
When selecting joinery, consider the architectural style of your home, and choose the joinery to complement, or modernise the look. The most common options for joinery around windows and doors include:
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