VapourTech Wall

Next-generation Air Barrier, Class 4 Vapour Permeable wall wrap

Features and Benefits

Bushfire Attack Levels

Ametalin VapourTech Wall is suitable for use in wall systems BAL – LOW to BAL – FZ to comply with AS 3959—2009 Construction of buildings in bushfire prone areas.

Product Details

Product CodeDutyThicknessWidthLengthArea per roll
VTW-45Light Wall0.46 mm1500 mm30 m45 m²
VTW-91Light Wall0.46 mm3050 mm30 m91.5 m²
  • VapourTech™ Wall is used as a wall wrap behind fibre cement and timber cladding in most Australian climates.
  • Wall wrap in typical brick veneer & double brick walls

* NOTE: For ABCB Climate Zone 1 and north of The Tropic of Capricorn in Climate Zone 2, substitute VapourTech™ Wall with a Class 1 or Class 2 Vapour Barrier such as SilverSark HVB or SilverSark xR. VapourTech™ Wall can be used as wall wrap in brick veneer systems. Where reflective cavities are desired, SilverWrap® xRS Micro-perforated is the preferred membrane for brick veneer systems outside of the humid tropics. If installed behind non-absorbent claddings such as steel, provision should be given for adequate drainage of any trapped moisture.


Lightweight Cladding Direct to StudWinterSummer
One layer of VapourTech Wall + R2.7 Fibrous Batt RT 3.2 RT 2.9
Lightweight Cladding battened out
One layer of VapourTech Wall + R2.5 Fibrous Batt RT 3.2 RT 2.9
Brick Veneer Wall – 40 mm Cavity
One layer of VapourTech™ Wall + R2.5 Fibrous BattRT 3.3 RT 3.0

When specifying, state the following:

Product Name: VapourTech™ Wall

The pliable building membrane to be installed shall be Ametalin VapourTech™ Wall, very high permeance wall wrap and shall be installed in accordance with AS 4200.2: 2017 Pliable Building Membranes and Underlays, Part 2: Installation.

Emittance Value: 0.58, 0.56
Emittance Classification: IR Non-Reflective, IR Non-Reflective
Vapour Permeance: 3.7982 ug/N.s
Vapour Control Classification: Class 4 Vapour Permeable
Water Control Classification: Water Barrier
Air Control Classification: Air Barrier
Flammability Classification: Low (≤5)
Duty Classification: Light Wall in accordance with AS/NZS 4200.1:2017