Pro Clima Airtightness System Featured in Raglan Home by David Wimmer

When David Wimmer of Wimmer Design decided to design and build a home in Raglan for his family, he wanted it to utilise as many natural materials as possible. He also wanted to use quality products that would ensure the health and wellbeing of the occupants.

Part of this cradle to cradle design process included using locally sourced untreated timber and Terra Lana wool insulation which allowed the offcuts to be used in heating (wood) and in the garden as weed mat (wool insulation).

The front wall of the home consists of a light rammed earth construction made up of earth, pumice, clay, sisal and straw, while the balance of the walls are 140mm timber framed with R3.2 insulation. Two layers of R2.4 wool insulation were installed in the ceiling.

A Natural Flow wastewater system (using worms) was also chosen for the nutrients it provides to the orchard, thus supporting the regenerative design.

The INTELLO airtightness system from Proclima was used to ensure that the structure was protected from internal moisture and to improve the energy conservation of the home. By creating an airtight envelope around the inside of the home, heat loss through the building envelope is controlled.

The home is heated by 10m² of solar water heating panels or through a wetback fireplace during cloudy days. The Wolf 1000L hot water system stores this energy and the heat is piped to radiators in each room.

Natural ventilation is provided through carefully planned window positioning using triple glazed timber joinery sourced from Europe, allowing airflow through the rooms and the whole home.

David has created a home that performs well and is comfortable throughout the four seasons due to the balance of insulation, airtightness, heating and ventilation.

Intelligent Airtightness Membrane (INTELLO PLUS)

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The pro clima airtightness system prevents uncontrolled air infiltration or leakage through the building envelope, and assists the drying capacity of the building through its unique moisture control properties.

Suitable for all construction and where there is risk of interstitial condensation
The protection of insulation from air movement
Preventing uncontrollable air flow though the building envelope
An optional continuous cavity for electrical and plumbing services can be created on the inside face of the external wall by fixing battens horizontally over the INTELLO membrane before installing the wall lining
The main advantage of a service cavity is to shift the plumbing and wiring out of the insulation layer
A service cavity also reduces the penetrations through the airtightness membrane allowing easy and fast installation of services
This also eliminates pressure points on inner lining (eg. plasterboard) from insulation expansion

The NZBC requires only that airtightness be considered, not measured. INTELLO directly assists with meeting the following requirements:

Clause E3.1 INTERNAL MOISTURE: Buildings must safeguard people against illness, injury, or loss of amenity that could result from the accumulation of internal moisture
Clause E3.2 INTERNAL MOISTURE: Buildings must avoid the likelihood of fungal growth or the accumulation of contaminants on linings and other building elements
Clause E2 EXTERNAL MOISTURE: Concealed spaces and cavities in buildings must be constructed in a way that prevents external moisture being accumulated or transferred and causing condensation, fungal growth, or degradation of building elements
Clause E2 EXTERNAL MOISTURE: Building elements must make due allowance for the following: (a) the consequences of failure, (c) variation in the properties of materials and in the characteristics of the site
Clause E2 EXTERNAL MOISTURE: Interior linings with all joints stopped require barriers to airflow
Clause H1 : ENERGY EFFICIENCY: The building must be constructed to limit uncontrollable airflow
Clause H1 : ENERGY EFFICIENCY: Account must be taken of physical conditions likely to affect energy performance of buildings; (c) Airtightness of the building envelope.
Clause B2 : DURABILITY: Performance B2.3.1(a), not less than 50 years, B2.3.1(b), 15 years and B2.3.2

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