VapourTech® RWC Roof Wall Commercial
$261.48
Sale price
$261.48
Regular price
$275.25
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VapourTech® RWC Roof Wall Commercial
$261.48
Sale price
$261.48
Regular price
$275.25
GST inclusive
Dispatch: Most orders are processed the same day. Metro delivery: Usually 1–3 business days. We do our best to get most items out on the next business day.
Australia-wide freight · Local pickup from Epping, VIC by arrangement. Ordering from the outback? Get in touch about deliveries to remote locations · Shipping details
VapourTech RWC is a Class 4 vapour permeable membrane for commercial roofs and walls. One roll size, 1500 mm by 30 m, covering 45 m², built up from four layers with a high strength polymer mesh through the middle and classified Medium duty to AS/NZS 4200.1:2017.
What vapour permeable is actually buying you
High permeance is the whole point of this membrane. It sheds bulk water from outside while still letting water vapour escape out of the structure, which is what keeps a commercial wall or roof cavity from holding moisture. Permeance is 2.144 µg/N·s with a water vapour transmission rate of 241 g/m² per 24 hours, and it is a water barrier to AS/NZS 4201.4 and an air barrier as well. Condensation in metal roofs explains why letting vapour out matters as much as keeping water in.
Non-reflective, so no air gap to detail
Emittance is 0.9 on both faces, category NN. It does not work by reflection, so it does not need an air gap in front of it and can sit directly against the frame. That makes it simpler to detail than a foil sarking, and unlike foil it is non-conductive.
Strength and fire
Tensile strength is 10.4 kN/m machine direction against a 9.5 minimum, edge tear 512 N against a 45 minimum, and it retains 85% of tensile strength after UV exposure. Flammability classification is Low, 5 or lower, and it complies with AS 3959-2018 for all Bushfire Attack Levels from BAL Low through to Flame Zone. Get independent advice before locking a sarking into a BAL design.
On site
Install to AS 4200.2 with the printed face out, and lap the joints down the slope so water always runs over a joint rather than into it. Suitable for Australian climate zones 2 to 8. Durability drops in industrial or farm buildings where the air carries chemicals, so ask us first if that is the setting.
Full permeance, strength and fire figures are in the table below. For where a membrane sits against the blanket and the sheeting, see Metal roof insulation in Australia.
Technical data
Ametalin technical data sheet (PDF)Sizes stocked
| Roll size | Area per roll | Nominal thickness |
|---|---|---|
| 1500 mm x 30 m | 45 m² | 0.83 mm |
Moisture and air control
| Vapour control | Class 4 vapour permeable (ASTM E96 Procedure B) |
|---|---|
| Vapour permeance | 2.144 µg/N·s at 23 °C and 50% RH |
| Vapour resistance | 0.5 MN·s/g |
| Water vapour transmission rate | 241.422 g/m² per 24 hours |
| Water control | Water barrier (AS/NZS 4201.4) |
| Air control | Air barrier |
| Surface water absorbency | High, 100 g/m² or more (AS/NZS 4201.6) |
High permeance is the point of this membrane. It sheds bulk water from outside while still letting water vapour out of the structure, which is what keeps a commercial wall or roof cavity from holding moisture.
Classification
| Duty | Medium (AS/NZS 4200.1:2017) |
|---|---|
| Emittance | 0.9 both faces, IR non-reflective, category NN |
| Electrical conductivity | Non-conductive |
| pH | 5.9 |
| Climate zones | Suitable for Australian climate zones 2 to 8 |
Strength and durability
| Tensile strength, machine direction | 10.4 kN/m (minimum 9.5) |
|---|---|
| Tensile strength, lateral direction | 7.5 kN/m (minimum 6.0) |
| Edge tear, machine direction | 512 N (minimum 45) |
| Edge tear, lateral direction | 395 N (minimum 45) |
| UV exposure | Pass, retains 85% of tensile strength and the water barrier (ASTM G154) |
| Shrinkage | 0.0%, well inside the 0.5% limit |
| Dry and wet delamination | Pass (AS/NZS 4201.1 and 4201.2) |
| Folding endurance | Pass (AS 1301.423) |
Fire
| Flammability classification | Low, 5 or lower (AS 1530.2) |
|---|---|
| Bushfire areas | Complies with AS 3959-2018 for all Bushfire Attack Levels, BAL Low through to Flame Zone |
Get independent advice on sarking selection before locking it into a BAL design.
Build-up
| Layer 1 | Non-woven polymer fabric |
|---|---|
| Layer 2 | High permeance membrane |
| Layer 3 | High strength polymer mesh |
| Layer 4 | Non-woven polymer fabric |
Fitting notes
Install to AS 4200.2. Run it with the printed face out and lap the joints down the slope so water always runs over a joint, not into it. It is a non-reflective membrane, so it does not need an air gap to work and can sit directly against the frame. Durability drops in industrial or farm buildings where the air carries chemicals, so check with us if that is the setting.
Figures are taken from the Ametalin technical data sheet for VapourTech RWC Roof Wall Commercial, document APM-45763-0. The full manufacturer document is linked above. Ametalin can change specifications without notice, so check the current sheet before specifying on a job.
Common questions
What sizes are stocked and how much does each one cover?
It is stocked in one option, 1500 mm x 30 m. The table above lists the coverage or quantity you get.
What thermal performance does it have?
Emittance: 0.9 both faces, IR non-reflective, category NN. Electrical conductivity: Non-conductive.
Can it be used in a bushfire area?
Bushfire areas: Complies with AS 3959-2018 for all Bushfire Attack Levels, BAL Low through to Flame Zone.
How does it handle moisture?
Vapour control: Class 4 vapour permeable (ASTM E96 Procedure B). Vapour permeance: 2.144 µg/N·s at 23 °C and 50% RH. Vapour resistance: 0.5 MN·s/g. Water vapour transmission rate: 241.422 g/m² per 24 hours. Water control: Water barrier (AS/NZS 4201.4). Surface water absorbency: High, 100 g/m² or more (AS/NZS 4201.6). Dry and wet delamination: Pass (AS/NZS 4201.1 and 4201.2).
Does it meet Australian standards?
Flammability classification: Low, 5 or lower (AS 1530.2).
How is it installed?
Install to AS 4200.2. Run it with the printed face out and lap the joints down the slope so water always runs over a joint, not into it. It is a non-reflective membrane, so it does not need an air gap to work and can sit directly against the frame. Durability drops in industrial or farm buildings where the air carries chemicals, so check with us if that is the setting.
Cannot see your question? Ask our team and we will get you an answer.
Figures are taken from the Ametalin technical data sheet for VapourTech RWC Roof Wall Commercial, document APM-45763-0. The full manufacturer document is linked above. Ametalin can change specifications without notice, so check the current sheet before specifying on a job.
