Healthy living indoors in the Rotorua NOW Home®

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Getting rid of damp

The Rotorua NOW Home® has high insulation levels and passive solar design to create a warmer indoor environment, less prone to condensation.  Cold air holds far less moisture than warm air.  In cold temperatures the moisture naturally in the air settles on cold surfaces such as un-insulated walls, ceilings and windows as condensation.    Double glazing keeps the inside glass surface warmer, so fogging and condensation (which can damage woodwork, furniture or upholstery) is much less of a problem.

A rangehood extracts moist air from the kitchen, and extractor fans are used in both bathrooms.  A clothes line behind the house encouraged the tenants to dry their clothes out in the sun. 

Passive ventilation

Passive ventilation is provided by cedar louvres to the sides of windows, which can be left open without compromising security.  To be doubly sure, the windows closest to the louvres have security locks fitted.

When closed, the louvres are airtight, but even partly open, they allow the continuous exchange of fresh for stale air.  As a result, Relative Humidity levels inside the house are low so mould, mildew, bacteria and dust mites are less likely to thrive.



The Rotorua NOW Home® has a butterfly style roof with an internal gutter, chosen by Housing New Zealand to give the house a more modern look.  Recognising that the risk of leaks associated with internal guttering, the dimensions of the gutter and downpipes significantly exceed Code requirements. The roof is sloped to shed water into the gutter which provides a single collection point for rainwater harvesting. 

The internal gutter is a wide central roof area, wide enough to walk down to clean with a broom to prevent blockages.  The gutter is lined with a double layer waterproof membrane system.

Flashings have been installed wherever disparate materials meet.  Joins in materials, and around windows, are often prime sites for moisture penetration into the linings of a home.  Flashings are used:

  • around all windows and doors 
  • around the concrete slab and insulation 
  • wall cladding junctions 
  • fascias (total fascia system) 
  • barge flashings 
  • around the entry roof

Drains have been installed around the edge of the concrete deck area, to prevent rainwater entering the house or the building structure.

Kiln-dried boric-treated H1.2 Radiata pine was used for wall and roof framing.  This meets the new requirement for treated radiata to be used in external walls and moisture risk situations.

Rotorua NOW Home

Rotorua NOW Home®