VapourTech Brane VHP Wall Wrap

$75.60

$75.60 $84.00

GST inclusive

This size is on sale. Sale items are not included in the Opening Offer order discount. Offer details

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.

Delivery to VIC and NSW: $55 in metro Melbourne and metro Sydney, $99 in the outer ring around both cities, $149 anywhere else in the two states · Local pickup from Epping, VIC by arrangement · Shipping details

Trade Select VapourTech Brane VHP is a vapour permeable membrane from Ametalin, stocked in four roll sizes from 1370 x 30 m covering 41.5 m² up to 3050 x 30 m covering 91.5 m².

VHP means very high permeability

A high permeability membrane lets water vapour move out of the structure readily while still shedding liquid water from outside. That combination is what lets a wall dry outward instead of holding moisture in the frame, and it is the reason permeable membranes moved up the priority list in recent code cycles. Condensation and what NCC 2022 asks for covers the reasoning.

The wide rolls

The 2740 mm and 3050 mm rolls run a full storey in one piece and remove the horizontal join. On a commercial elevation that is the main reason to choose them.

For declared permeance, duty classification, strength and BAL figures, ask us and we will send the current Ametalin data sheet.

Technical data

Ametalin technical data sheet (PDF)

Ametalin · Triple layer non-woven polymer fabric over a very high permeance membrane core · Vapour permeable wall wrap for Climate Zones 2 to 8 application

Sizes stocked

Roll size	Coverage	Product code
1370 mm x 30 m	41.1 m²	TSVHP-41
1500 mm x 30 m	45 m²	TSVHP-45
1500 mm x 30 m, white faced	45 m²	TSVHP-W-45
2740 mm x 30 m	82.2 m²	TSVHP-82
3050 mm x 30 m	91.5 m²	TSVHP-91

Barrier classifications

Vapour control	Class 4 Vapour Permeable (ASTM E96)
Vapour permeance	12.848 µg/N·s
Water control	Water Barrier (AS/NZS 4201.4:1994)
Electrical conductivity	Non-conductive

Very High Permeance. Water vapour absorbs and diffuses through the non-woven core while liquid water cannot pass inwards.

Strength

Duty classification	Light Wall (AS/NZS 4200.1:2017)
Nominal material thickness	0.38 mm
Burst strength	254 N (min 200 N, AS 2001.2.19-1998)
Edge tear machine direction	180 N (min 45 N)
Edge tear lateral direction	89 N (min 45 N)
Dry and wet delamination	Pass (AS/NZS 4201.1 and 4201.2:1994)
Shrinkage, repeated wetting and drying	0.0% (limit under 0.5%)

Fire

Flammability index	Low, at or below 5 (AS 1530.2-1993)
Bushfire areas	All BALs

Seek independent advice on membrane selection before installation in a BAL design.

Thermal, declared total system R-value

Lightweight cladding fixed to battens plus R2.7 batt	RT 2.92 winter, RT 2.77 summer
Brick veneer wall plus R2.7 batt	RT 2.93 winter, RT 2.78 summer
Emittance	0.9 both faces, IR Non-reflective
Emittance category	NN

Calculated to AS/NZS 4859.2:2018 for typical mainland capital city conditions. This membrane is not reflective, so it does not need an air gap to perform.

Climate zones and exposure

Suitable	Climate Zones 2 to 8, all wall systems, behind all cladding types
Not recommended	ABCB Climate Zone 1, where a Class 1 or 2 vapour barrier should be used instead
UV exposure	30 days
Chemical	Chemically non-reactive, suits corrosive coastal conditions

Fitting notes

Install to AS 4200.2:2017 Pliable Building Membranes and Underlays, Part 2. Behind non-absorbent cladding such as steel, provide drainage for any trapped moisture. The 2740 mm roll halves installation time on a full storey and removes a horizontal join. Do not leave the wrap exposed beyond 30 days of UV. Store rolls undercover in a clean dry place in the pack provided.

Figures are taken from the Ametalin technical data sheet for Trade Select VapourTech Brane VHP, TPM-24124-2, product code TSVHP. The manufacturer document is linked above. Ametalin can change specifications without notice, so check the current sheet before specifying on a job.

Common questions

Which climate zones is it for?

Climate Zones 2 to 8. Ametalin specifically say it is not recommended in ABCB Climate Zone 1, where a Class 1 or Class 2 vapour barrier should be used instead.

Is it a water barrier as well as permeable?

Yes, and that is unusual. It is a Class 4 Vapour Permeable membrane and a Water Barrier at the same time, so it can go behind all cladding types rather than only behind a drained cavity.

What does VHP mean?

Very High Permeance. At 12.848 µg/N·s it is far more open than a micro-perforated wrap, because the permeability comes from the non-woven core rather than from holes punched through a foil.

Why buy the 2740 or 3050 mm rolls?

They run a full storey in one piece. That removes the horizontal join, halves the installation time and cuts the number of laps that have to be taped correctly.

How long can it stay exposed?

30 days of UV exposure. Beyond that the cladding needs to be on.

Is it reflective?

No. Emittance is 0.9 on both faces and it is classified IR Non-reflective. It does not need an air gap behind it to work, which makes the installation simpler than a foil wrap.

What is the white faced roll?

It is the same membrane with a white outer face, product code TSVHP-W-45, in the 1500 x 30 m size. Choose it where the wrap will be visible through an open joint cladding and the standard print would show.