Trade Select Sarking xR HD
1350 mm x 60 m (81 m²)
$214.00
Sale price
$214.00
Regular price
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Trade Select Sarking xR HD
$214.00
Sale price
$214.00
Regular price
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
Trade Select Sarking xR HD is the double sided reflective version of Ametalin's heavy duty sarking. Both faces are low emittance, 0.05 on the anti-glare side and 0.03 on the foil side, which is where the extra R-value in the name comes from.
Two reflective faces, two air gaps
A single sided sarking only works against the cavity it faces. With both faces reflective, a roof that has an air space above and below the membrane gets a contribution from each side. Ametalin declare RT 1.14 winter and RT 1.82 summer for an unventilated 22 degree residential roof, against RT 0.93 and RT 1.51 for the standard Sarking HD. Battened out lightweight cladding with an R2.7 batt is declared at RT 3.00 winter.
Still a heavy duty membrane
Tensile strength 12.8 kN/m machine direction against a 12.5 kN/m minimum, edge tear 507 N against 80 N, nominal thickness 0.17 mm. Class 2 vapour barrier at 0.02141 µg/N·s, water barrier and air barrier.
Fire
Flammability index Low, at or below 5, and compliant with AS 3959-2018 for use in all BALs. Note that at 0.17 mm it is still under the 1 mm limit, but Ametalin do not claim the non-combustible construction concession on this sheet the way they do for Sarking HD, so do not assume it.
On site
Both faces are reflective, so an installation that presses the membrane flat on both sides throws away most of what you paid for. Batten it out or run it over a spacer. It is electrically conductive, so keep it clear of wiring. Install to AS 4200.2. Full figures are in the table below.
Technical data
Ametalin technical data sheet (PDF)Sizes stocked
| Roll size | Coverage | Product code |
|---|---|---|
| 1350 mm x 60 m | 81 m² | TSHD-XR-81 |
| 1500 mm x 30 m | 45 m² | TSHD-XR-45 |
Barrier classifications
| Vapour control | Class 2 Vapour Barrier (ASTM E96) |
|---|---|
| Vapour permeance | 0.02141 µg/N·s |
| Water control | Water Barrier (AS/NZS 4201.4:1994) |
| Air control | Air Barrier (AS/NZS 4200.1:2017) |
| Electrical conductivity | Electrically conductive |
Strength
| Duty classification | Heavy (AS/NZS 4200.1:2017) |
|---|---|
| Material thickness | 0.17 mm |
| Tensile strength machine direction | 12.8 kN/m (min 12.5 kN/m) |
| Tensile strength lateral direction | 8.4 kN/m (min 7.5 kN/m) |
| Edge tear machine direction | 507 N (min 80 N) |
| Edge tear lateral direction | 369 N (min 80 N) |
Fire
| Flammability index | Low, at or below 5 (AS 1530.2-1993) |
|---|---|
| Bushfire areas | All BALs (AS 3959-2018) |
Seek independent advice on sarking selection before installation in a BAL design.
Thermal, declared total system R-value
| Residential roof, 22 degree pitch, unventilated | RT 1.14 winter, RT 1.82 summer |
|---|---|
| Lightweight cladding battened out plus R2.7 batt | RT 3.00 winter, RT 2.89 summer |
| Emittance | Anti-glare side 0.05, foil side 0.03 |
| Emittance classification | IR Reflective both faces |
| Emittance category | RR |
Calculated to AS/NZS 4859.2:2018 for typical mainland capital city conditions. Each reflective face needs an air cavity in front of it to contribute.
Durability
| Dry delamination | Pass (AS/NZS 4201.1:1994) |
|---|---|
| Wet delamination | Pass (AS/NZS 4201.2:1994) |
| Shrinkage, repeated wetting and drying | 0.0% (limit under 0.5%) |
Compliance
| Standards | AS/NZS 4859.1:2018 and AS/NZS 4200.1:2017 |
|---|---|
| NCC | Meets NCC requirements for pliable building membranes, insulation and sarking-type materials |
Fitting notes
Install to AS 4200.2 Pliable Building Membranes and Underlays, Part 2. Both faces are reflective, so leave an air gap on each side wherever the design allows it. Lap and tape the joins and seal around penetrations. The product is electrically conductive, so keep it clear of wiring. Store the rolls undercover in a clean dry place in the pack provided, away from cement, mortar and other alkaline products.
Figures are taken from the Ametalin technical data sheet for Trade Select Sarking xR HD, TPM-23249-3, product code TSHD-XR. The manufacturer document is linked above. Ametalin can change specifications without notice, so check the current sheet before specifying on a job.
Common questions
What does xR mean?
Extra R-value. Both faces are reflective, 0.05 anti-glare side and 0.03 foil side, so the membrane can contribute to the R-value of an air space on either side of it rather than only one.
How much better is it than plain Sarking HD?
On the declared unventilated 22 degree roof, RT 1.14 winter and RT 1.82 summer against RT 0.93 and RT 1.51. On battened out lightweight cladding with an R2.7 batt, RT 3.00 winter against RT 2.75.
Do I need to batten it out?
To get the benefit, yes. A reflective face pressed against roof sheeting or cladding cannot see an air space and contributes almost nothing.
Is it vapour permeable?
No. It is a Class 2 vapour barrier at 0.02141 µg/N·s. Choose a permeable underlay if the roof or wall is designed to dry outward.
Can I use it in a bushfire area?
Yes. Flammability index Low, at or below 5, and it complies with AS 3959-2018 for all BALs. Take independent advice on sarking selection before locking in the BAL design.
Which roll should I order?
The 1350 x 60 m roll covers 81 m² and the 1500 x 30 m roll covers 45 m². The longer roll cuts the number of end joins on a long run.
Cannot see your question? Ask our team and we will get you an answer.
Answers use the Ametalin technical data sheet for Trade Select Sarking xR HD, TPM-23249-3.
