The developer of this house in Wanaka wanted it to be a cut above what is generally available on the market.
They wanted a contemporary design with guaranteed low energy demand and superior environmental credentials.
We modelled the energy demand in PHPP and used the tool and sun studies in ArchiCAD to assess and mitigate its overheating risk. As is often the case in Wanaka, the views are to the west and this often leads designers to use large areas of west facing glazing, which then receives the brunt of the fierce, low afternoon sun. The design of this house balances the need for passive solar gain with the beautiful views of Mt Roy and Black Peak to the west. It is also moulded to the section, stepping up with the incline of the land.
The Homestar 7 rating was achieved through low energy design, Environmental Choice paints, finishes, linings and fittings, provision for recycling, composting and veggie gardens, xeriscaping (using native plants that require no irrigation once established), LED lighting, WELS rated (low flow) kitchen and bathroom fittings, FSC timber, and a waste and environmental policy for the contractor, amongst many other things that make up this very broad environmental tool. The house was rated in order for potential buyers to see an independent verification of its environmental credentials.
The Society would like to congratulate the applicant on their commitment to sustainable building. (Subdivision design board)
As with all our projects, we modelled the skillion roof in WUFI to check for moisture- transport issues. We used a membrane from Pro Clima to ensure that moisture does not accumulate in the skillion roof.
PVC windows were specified as a happy medium – the performance of timber windows but with minimal extra cost. A MAXRaft fully insulated slab ensures significantly reduced heat loss through the slab.
The developer is Red Bridge Developments. Thanks to them for seeing the value in both a higher quality build and also the value of the Homestar rating.