Prevent Weather Barrier Issues with the DuPont System

Below are ten job-site weather barrier problems that can effect long term building durability via diminished air and water hold-out performance. These problems have been gathered by a building weather barrier specialist with 20 years experience in New Zealand and North America on timber framed structures:

Weather Barrier UV Exposure resistance exceeded. Typically this is 30 — 120 days depending on manufacturer. Over-exposure occurs often due to weather, material supply and scheduling issues.
Overdriven nail and staple fasteners. This can damage the outer layer/skin of weather barrier. Staple fasteners do not have a gasket and can allow water to enter the wall assembly. Cap fasteners are more effective. Excess staple fasteners can provide numerous gateways for moisture to enter the envelope.
Abrasion, tearing or ripping of the weather barrier on site with no back-up repair method. Damage to the delicate outer film layer or delamination from job-site wear and tear can significantly reduce air and water resistance. Micro-porous, laminated weather barriers are more susceptible than 'non-laminated' spun-bonded olefin weather barriers such as Tyvek HomeWrap.
Weather barrier overlaps not taped or sufficiently lapped. Just like unzipping your jacket on a cold, wet, windy day, both moisture and wind-washing can significantly affect insulation performance.
Flashing tape incompatible with weather barrier. The flashing tape does not stick effectively and allows bulk water to enter the wall cavity.
Relying on silicon to seal gaps in wall penetrations.
Relying on spray foam as a weather barrier around windows and other wall penetrations.
Reverse shingling of weather barrier by not overlapping seams correctly. Just like tucking trousers into your boots on a rainy day.
Plumbing, electrical and HVAC penetrations not sealed at the weather barrier. A pathway for air and water intrusion.
Incompatible weather barrier system. System components that are a mix of manufacturers and brands. Manufacturer formulation changes from system to system and mixing components can lead to system incompatibility.

To find out more, see Du Pont Tyvek's video 'Are you smarter than water?'

DuPont Flashing Tape

Tyvek

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DuPont Flashing Tape is window flashing tape, using a 100% butyl self adhesive.

LBC Red List Free

Homestar / Green Star

For a risk score between 0-20 in accordance with NZBC Acceptable solution E2/AS1, Table 2
Building Wind Zones up to and including Very High NZS3604:1999, Extra High if used over a Rigid Air Barrier
To seal around windows, doors and other wall penetrations as a secondary defence against water penetration
It is compatible with timber and steel framed buildings
It is compatible with most construction materials including concrete, wood, steel and synthetic wall underlays
Can be used in Rigid Air Barrier applications on ply and fibre cement substrates

Extra High Wind Zone

Specific Design Wind Zone

DuPont Flashing Tape 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 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 Flashing Tape meet the requirements of Acceptable Solution to NZBC E2, and has a CodeMark Product Certification.

Durability

External Moisture

Hazardous Building Materials

CodeMark

DuPont FlexWrap NF Flashing Tape

Tyvek

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DuPont FlexWrap NF is a one piece, flexible flashing tape, with an 100% butyl self adhesive.

LBC Red List Free

Homestar / Green Star

For a risk score between 0-20 in accordance with NZBC Acceptable solution E2/AS1
Building Wind Zones up to and including Very High NZS3604:1999, Extra High if used over Rigid Air Barrier
To seal around windows, doors and other wall penetrations as a secondary defence against water penetration
It is compatible with timber and steel framed buildings
It is compatible with most construction materials including concrete, wood, steel and synthetic wall underlays
Can be used in Rigid Air Barrier applications on ply and fibrecement substrates

Extra High Wind Zone

Low Wind Zone

Very High WInd Zone

DuPont FlexWrap NF 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 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 FlexWrap NF meet the requirements of Acceptable Solution to NZBC E2, and has a CodeMark Product Certification.

Durability

External Moisture

Hazardous Building Materials

CodeMark

DuPont Tyvek Contractor Tape

Tyvek

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DuPont Tyvek Contractor Tape is a key component of the DuPont Tyvek Weatherization System.

DuPont Tyvek Weatherization System
Can be installed in all wind zones including Extra High

Used in North America and Europe for over 20 years. In New Zealand for over 10 years.

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

DuPont Tyvek Metal Roof Underlay

Tyvek

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DuPont Tyvek Metal is a breathable, self supporting synthetic roof underlay.

Building wind zones up to and including Extra High.

Recommended for standing seam or low profile roof cladding applications in skillion roof type constructions or any application where extra ventilation is required.

It is recommended for use as a self supporting roof underlay (R2) on roof pitches greater than 3º.

Suitable for the following roof applications:

Direct fixing on all roof cladding types including concrete and clay tiles, profiled metal and pressed metal tiles
Roofs using plywood or other rigid air barrier type solid substrate under the cladding

3°

The use of DuPont Tyvek Metal is considered an alternative solution complying with NZBC Clause E2.

DuPont Tyvek Metal, 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/AS1 Table 1 (Building Wraps/Roof Underlay).
NZBC Clause E2: External Moisture. Contributes to meet these requirements for use as a roof underlay and air barrier.
NZBC Clause F2: Hazardous Building Materials. Meets this requirement and will not present a health hazard to people according to F2.3.1.

CodeMark

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