• 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) 

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

DuPont Tyvek HomeWrap must be:

• Considered as part of the wall cladding system and not in isolation
• Used on studs at a maximum of 600mm centres and dwangs fitted flush at maximum of 1200mm on centre
• Used only as a wall underlay
• Laps taped in high wind zones and above
• Laps taped to meet requirements of air barrier and H1-energy efficiency

DuPont Tyvek HomeWrap should not be:

• Used as a roof underlay
• Exposed to UV for greater than 120 days
• Direct fixed behind metallic non absorbent claddings to timber or steel studs

DuPont Tyvek HomeWrap is suitable for use with LOSP treated timber, upon condition the solvent in LOSP treated timber having had sufficient time to evaporate which is typically 7 days.

When used with steel framing, requires a thermal break between underlay and framing.

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

• Introduced by DuPont to the building industry as the first synthetic wall underlay in the category back in 1978
• Installed on 15 million buildings over a 40 year period in different climate zones around the world
• First introduced to New Zealand in the early 1990s

• Can be exposed to the elements for up to 120 days before cladding
• High Moisture Vapour Transmission Rate of 370 g/m²-24hrs (per ASTM E-96 ) which allows buildings to dry out from the inside helping prevent mould and rot
• Excellent Water Penetration Resistance of 2500mm (as per ATTC 127)