Optimise the Building Envelope with DuPont Tyvek

As building codes became more stringent, the requirements for the building envelope changed. The building envelope must help to improve energy efficiency, improve building durability, protect against mould and its long-term liability issues, and ultimately, help increase the comfort for a building’s occupants.

Tyvek building wrap solutions resist moisture and air, but are highly vapour permeable, to reduce the risk of condensation damage, wood rot or mould growth.

Air penetration resistance

One basic function of a building wrap is to help insulation maintain its R-value by keeping air from leaking through the wall system. The ability of the water-resistive barrier in helping to prevent air infiltration directly relates to the energy costs of heating and cooling a home. The high air resistance level of DuPont Tyvek HomeWrap allows insulation to be more effective, helping to lower energy costs.

Water penetration resistance and vapour permeability

Water resistance and high drying potential are key components for creating the optimal wall system. DuPont Tyvek HomeWrap has a high level of water resistance to help protect the wall cavity from water that gets behind the cladding.

A building wrap should also have a high perm rating so that the natural ability of a wall system to dry out is not impeded. The excellent moisture vapour permeability of DuPont Tyvek HomeWrap helps prevent moisture accumulation in walls which can lead to the formation of mould, mildew and wood rot.

DuPont Tyvek HomeWrap Wall Underlay

Tyvek

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DuPont Tyvek HomeWrap is a breathable, fire retardant, synthetic wall underlay.

Cavity:
- All cladding types with both timber and steel framing
- Rigid Air Barriers, (over-sheathed)
Direct fixed:
- With absorbent claddings such as timber, polyymeric cladding, plywood, gypsum fibre cement, brick wood, and stucco plaster on timber framing, or over thermal break on steel framing
- Rigid Air Barriers, (over-sheathed)

All cladding types with both timber and steel framing
Rigid Air Barriers, (over-sheathed)

With absorbent claddings such as timber, polyymeric cladding, plywood, gypsum fibre cement, brick wood, and stucco plaster on timber framing, or over thermal break on steel framing
Rigid Air Barriers, (over-sheathed)

DuPont Tyvek HomeWrap Wall Underlay:

Can be installed in all Wind Zones up to and including Very High, or Extra High if over a rigid air barrier
A non-directional wall underlay meaning the wrap can be installed upside down or inside out and performance will not be compromised
Resistant to most surfactants meaning it is suitable for use behind Cedar Cladding (endorsed by the Western Red Cedar Association)
Can be used in all New Zealand climate zones
Can be used in all seismic and corrosion zones

Corrosion Exposure Zone D

Very High Earthquake Zone

Low Wind Zone

Specific Design Wind Zone

Very High WInd Zone

As per CodeMark Certification, DuPont Tyvek HomeWrap, when installed in accordance with the recommended guidelines will meet or contribute to meet the following provisions of NZBC:

NZBC Clause B2: Durability. Meets the requirement of NZBC B2.3.1 a) 50 years and b) 15 years
NZBC Clause E2: External Moisture. Contributes to meet these requirements
NZBC Clause F2: Hazardous Building Materials. Meets this requirement and will not present a health hazard to people

DuPont Tyvek HomeWrap is an Acceptable Solution to NZBC E2/AS1

Durability

Protection from Fire

External Moisture

Internal Moisture

Hazardous Building Materials

Energy Efficiency

CodeMark

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