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.

INTELLO PLUS Intelligent Airtightness Membrane

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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.

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Declared

Post-Consumer Recyclable Content

Pre-Consumer Recycled Content

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

BRANZ Appraised

ROFLEX and KAFLEX Penetration Sealing Grommets

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KAFLEX and ROFLEX Grommets are pipe and cable penetration seals consisting of a soft, flexible EPDM rubber and will cope with up to 180 days UV exposure.

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Wall Underlays:

KAFLEX and ROFLEX Grommets have been appraised as pipe and cable penetration seals for use where the penetration is through the wall underlay on framed walls within the following scope:

within the limitations of NZBC Acceptable Solution E2/AS1, Paragraph1.1 with regards to building height and floorplan area
with flexible wall underlays situated in NZS3604 Wind Zones up to, and including, Very High; or
with flexible wall underlays used over rigid wall underlays in accordance with E2/AS1,Paragraph 9.1.7.2, situated in NZS3604 Wind Zones up to, and including, Extra High; or,
with proprietary plywood or fibre cement based rigid wall underlays (rigid air barriers).

The flexible and rigid wall underlays must be covered by a valid BRANZ Appraisal.

Roof Underlays:

KAFLEX and ROFLEX Grommets have also been appraised as pipe and cable grommets for use where the penetration is through the roof underlay on framed pitched roofs within the following scope:

within the limitations of NZBC Acceptable Solution E2/AS1, Paragraph1.1 with regards to building height and floor plan area; and,
with flexible roof underlays fixed over framing or rigid roof sarking; and,
situated in NZS3604 Wind Zones up to, and including, Extra High

The flexible roof underlays must be covered by a valid BRANZ Appraisal.

Specific Design:

— KAFLEX and ROFLEX Grommets have also been appraised for use on buildings subject to specific weathertightness design. Building designers are responsible for the building design and for the incorporation of KAFLEX and ROFLEX Grommets into their design in accordance with the declared properties and the instructions of Pro Clima(NZ)Ltd

In the opinion of BRANZ, KAFLEX and ROFLEX Grommets, if designed, used, installed and maintained in accordance with the statements and conditions of this Appraisal, will meet or contribute to meeting the following provisions of the NZBC:

Clause B2 DURABILITY: Performance B2.3.1 (b), 15 years and B2.3.2. KAFLEX and ROFLEX Grommets meet these requirements. See Paragraphs 8.1 and 8.2.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. When used as part of the wall or roof cladding system, KAFLEX and ROFLEX Grommets will contribute to meeting this requirement. See Paragraphs 7.1 - 7.7 and 11.1 - 11.2.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. KAFLEX and ROFLEX Grommets meet this requirement and will not present a health hazard to people.

BRANZ Appraised

SOLITEX MENTO® 1000 Roof Underlay

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SOLITEX MENTO® 1000 provides weather and condensation protection for your roof, under all weather conditions.

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Declared

SOLITEX MENTO 1000 has been appraised for use as a self-supporting roof underlay on buildings within the following scope:

the scope of limitations of NZBC Acceptable Solution E2/AS1, Paragraph 1.1 with regards to building height and floor plan area; and,
with masonry tile roof cladding; and,
with metal tile and profiles metal roof cladding; and,
suited to NZS 3604 Wind Zones up to, and including Extra High.

In the opinion of BRANZ, SOLITEX MENTO 1000, if used, designed, installed and maintained in accordance with the statements and conditions of Appraisal No.876 (2014), will meet, or contribute to meeting the following provisions of the NZBC:

Clause B2 DURABILITY: Performance B2.3.1(a), not less than 50 years, B2.3.1(b), 15 years and B2.3.2. SOLITEX MENTO 1000 meets these requirements.
Clause E2 EXTERNAL MOISTURE: Performance E2.3.2. When used as part of the roof cladding system, SOLITEX MENTO 1000 will contribute to meeting this requirement.
Clause F2 HAZARDOUS BUILDING MATERIALS: Performance F2.3.1. SOLITEX MENTO 1000 meets this requirement and will not present a health hazard to people.

SOLITEX MENTO 1000 has been Appraised as an Alternative Solution in terms of the New Zealand Building Code Compliance.

BRANZ Appraised

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