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Airtightness Membrane Helps Protect Skillion Roof

When designing and building their dream home on an exposed site in rural Raglan, architectural designer, Alice (Rubix Architecture), and joiner, Luke knew just how important it would be to have a high-performing building envelope. 

Starting from the ground up, they chose a Cupolex slab system which is manufactured from 100% recycled materials and creates no waste. Slab edge insulation was also installed to reduce heat loss.

The couple chose locally produced Terra Lana natural wool insulation for the home, which is protected by SOLITEX EXTASANA building wrap on the outside of the framing. This non-porous building wrap from pro clima offers a 10,000mm water column pressure resistance.

An INTELLO Plus airtightness layer has been installed on the inside of the framing of both walls and roof, creating an airtight envelope which improves the thermal performance of the home.

Special attention was paid to the design of the skillion roof to ensure it remains dry. The INTELLO Plus membrane limits internal moisture from entering the insulation space where it could condense if it comes into contact with materials below dew-point temperature. Having a variable moisture diffusion function, this membrane allows the moisture to escape from the roof space when required. 

Solitex Mento 3000 was used on the outside of the insulation. This roof underlay is extremely water-resistant while at the same time being very diffusion open.

Luke has manufactured all the window and door joinery onsite himself including seals to assist in the airtightness of the building.

Ventilation will be provided by a Zhender heat recovery system while the home will be heated via in-slab hydronic heating. This system is powered by solar hot water panels on the roof and backup electric heating.

The home is completely off-grid with 8KW of solar panels and a 10KWh battery system. This system will offer ample power for the homes as well as some extra to charge an electric vehicle.

The property includes a guest cottage and a vegetable garden with greenhouse.

View more information on pro clima, including contact details.
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