Minimising Condensation Risk for a Home Surrounded by Nature

Recently, DriSpace products were specified for a house being built in a secluded area of North Shore Auckland, surrounded by nature, where ventilation and airtightness become paramount. The owner wanted to build an energy-efficient home and reduce risks of interstitial condensation due to having limited sunlight as a result of trees and bushes encompassing the home.

With the use of DriStud Wall Wrap and Vent products for passive ventilation, “build tight and ventilate right” can be achieved. DriStud Wall Wrap is engineered for such conditions, as it is an air barrier that allows for high moisture vapour transfer, creating a healthier and more energy-efficient structure. When VB20 vented battens are installed correctly, a ventilation and drainage path is created through the wall and roof cavities, enabling movement and release of warm air which can eliminate condensation in the roof void and wall cavity.

The Over Fascia Vent (G2500N/G1200N) is used for ventilation in the eaves, designed to discreetly ensure positive airflow in the roof space between the roof underlay and fascia board. To ensure the ceiling is air and vapour tight and to limit the passage of moisture-laden air entering the roof space, ProctorPassive SmartVap is connected to the DriStud Wall Wrap at the wall junction.

DriSpace offers an extensive range of solutions that attain the goal to “build tight and ventilate right” from top to bottom. With CodeMark Certified DriStud roof and wall underlays, BRANZ appraised VENT product for Passive Ventilation, and ProctorPassive airtight membranes in the roof and wall, energy-efficiency, passive ventilation and airtight envelopes can be achieved.

DriStud Wall Wrap

DriSpace

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DriStud Wall Wrap is engineered from resilient non-woven fabric and is a commercial grade building wrap.

DriStud Wall Wrap is intended for use on buildings designed in accordance with NZS 3604:2011 paragraph 1.1 and in Wind Zones up to and including ‘Very High’.
It may be installed over timber and steel framing.
Where DriStud Wall Wrap is to be installed over steel framing it is important to ensure an adequate thermal break has been installed.
DriStud Wall Wrap may also be used in conjunction with the following substrates:

Oriented strand board
Concrete
Fibre cement
Plywood

DriStud Wall Wrap may be used where the external cladding is direct fixed or over a nominal 18mm ventilated cavity as per table 3, E2/AS1.
The scope of the CodeMark certificate covers the use of DriStud Wall Wrap in buildings:

up to 10m in height, and
with a risk score less than 20, when evaluated against the E2/AS1 risk matrix, and
up to and including very high wind zone as defined i in NZS 3604:2011, and
in all corrosion zones as defined in NZS3604:2011.

The scope of the certificate covers the use of DriStud Wall Wrap with DriStud Cool Window Flashing Tape, DriStud Bozz Window Flashing Tape and rigid air barriers made from plywood, OSB or fibre cement.

Oriented strand board
Concrete
Fibre cement
Plywood

up to 10m in height, and
with a risk score less than 20, when evaluated against the E2/AS1 risk matrix, and
up to and including very high wind zone as defined i in NZS 3604:2011, and
in all corrosion zones as defined in NZS3604:2011.

When specified and installed in accordance with the requirements of the Codemark Certificate, DriStud Wall Wrap will comply with the following provisions of the NZ Building Code:

Clause B1 Structure: B1.3.1, B1.3.2, B1.3.3 (a, c, q), B1.3.4 (a, b, c, d, e)
Clause B2 Durability: B2.3.1 (b), B2.3.2 (a)
Clause C Protection from Fire: C3.4(c)
E2 External Moisture: E2.3.2, E2.3.7 (a, b, c)
Clause F2 Hazardous Building Materials: F2.3.1

Structure

Durability

Protection from Fire

External Moisture

Hazardous Building Materials

CodeMark

ProctorPassive Wraptite SA

DriSpace

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Protor Passive Wraptite-SA is a self adhering airtight and vapour permeable membrane for wall and roof applications.

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Proctor Passive Wraptite SA can be installed on new and existing buildings and it is suitable for roof and wall applications for residential, commercial and high rise buildings.

Proctor Passive Wraptite SA's high vapour permeable peel and stick products used full coverage in pitched roofs and walls allows excellent drying capacity for assemblies wet during construction and from typical in service leaks over the life-time of the building.

Proctor Passive Wraptite SA can be installed over rigid air barrier, replacing tape and flexible underlay. It offers minimal mechanical fixings and provide greater integrity of installation and system.

Multiple substrate compatibility:

Exterior Gypsum Sheathing
Aluminium (painted or mill finish)
OSB
Most rigid insulation
Cast-in place concrete
Rigid vinyl
Pre-painted steel
Galvanised metal
Precast concrete
Steel
Concrete block
Plywood

When specified and installed in accordance with the technical literature, Proctor Passive Wraptite SA will comply with the following provisions of the NZ Building Code;

B1 Structure: B1.3.1, B1.3.2, B1.3.3 (c, h, q), B1.3.4 (a, b, c, d, e)
B2 Durability: B2.3.1 (a), B2.3.2 (a)
C Protection from Fire: C3.4(c)
E2 External Moisture: E2.3.2, E2.3.7 (a, b, c)
F2 Hazardous Building Materials: F2.3.1

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