Trade Select Sarking HD Heavy Duty Roof Sarking

Trade Select Sarking HD roll, heavy duty reflective foil sarking

$117.00

GST inclusive

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Trade Select Sarking HD is the heavy duty grade of Ametalin's single sided reflective membrane, used as roof sarking and as a wall wrap on jobs that need the extra strength. Five roll sizes, including a 1200 mm width that suits standard rafter spacings.

Where the heavy duty grade earns its money

Tensile strength is 13.9 kN/m machine direction against a 12.5 kN/m minimum, and edge tear is 586 N against an 80 N minimum. Sarking spends its working life stretched over rafters and walked on by roofers, so tear resistance is the property that decides whether the roll survives the day it goes on.

Non-combustible use

Sarking-type materials no thicker than 1 mm with a flammability index of 5 or less can be used where non-combustible material is required. This one is 0.12 mm with a Low flammability index, and Ametalin state it complies with the Deemed-to-Satisfy provisions for non-combustible building elements. It also complies with AS 3959-2018 for all Bushfire Attack Levels.

Vapour barrier, so check the roof design

This is a Class 2 vapour barrier at 0.004 µg/N·s, which is a genuinely tight membrane. Under a metal roof in a cold or mixed climate that can be exactly wrong, because the roof then has no way to dry upward. If the design calls for a permeable underlay, use VapourTech Brane VHP instead. Our article on metal roof condensation sets out the reasoning.

On site

Ametalin declare RT 0.93 winter and RT 1.51 summer for an unventilated 22 degree residential roof, and RT 2.75 winter for battened out lightweight cladding with an R2.7 batt. The foil face needs an air gap to deliver that. The membrane 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)

Ametalin · Reflective foil laminate on woven polypropylene · Roof sarking and heavy duty wall wrap application

Sizes stocked

Roll size	Coverage	Product code
1200 mm x 60 m	72 m²	TSHD-72
1350 mm x 30 m	40.5 m²	TSHD-40
1350 mm x 60 m	81 m²	TSHD-81
1500 mm x 30 m	45 m²	TSHD-45
1500 mm x 60 m	90 m²	TSHD-90

Barrier classifications

Vapour control	Class 2 Vapour Barrier (AS/NZS 4200.1 Clause 5.3.2.3)
Vapour permeance	0.004 µg/N·s (ASTM E96-2016 Procedure B)
Water control	Water Barrier (AS/NZS 4201.4:1994)
Air control	Air Barrier (AS/NZS 4200.1:2017)
Electrical conductivity	Conductive

Strength

Duty classification	Heavy (AS/NZS 4200.1:2017)
Nominal thickness	0.12 mm
Tensile strength machine direction	13.9 kN/m (min 12.5 kN/m)
Tensile strength lateral direction	9.0 kN/m (min 7.5 kN/m)
Edge tear machine direction	586 N (min 80 N)
Edge tear lateral direction	367 N (min 80 N)

Fire

Flammability index	Low, at or below 5 (AS 1530.2-1993)
Bushfire areas	All BALs (AS 3959-2018)
Non-combustible construction	Complies with the NCC Deemed-to-Satisfy provisions for non-combustible building elements

The concession applies to sarking-type materials no thicker than 1 mm with a flammability index of 5 or less. 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 0.93 winter, RT 1.51 summer
Lightweight cladding battened out plus R2.7 batt	RT 2.75 winter, RT 2.62 summer
Emittance	Printed side 0.90, foil side 0.03
Emittance category	RN

Calculated to AS/NZS 4859.2:2018 for typical mainland capital city conditions. The reflective face only contributes when it faces an air cavity.

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 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. Lap and tape the joins and seal around penetrations. Keep the foil face to the cavity so the reflective side can work. 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 HD, TPM-23249-0, product code TSHD. The manufacturer document is linked above. Ametalin can change specifications without notice, so check the current sheet before specifying on a job.

Common questions

Can I use this where the NCC calls for non-combustible material?

Ametalin state that it complies with the Deemed-to-Satisfy provisions for non-combustible building elements. The concession covers sarking-type materials no thicker than 1 mm with a flammability index of 5 or less. This one is 0.12 mm with a Low index.

Is it a breather sarking?

No. It is a Class 2 vapour barrier at 0.004 µg/N·s, one of the tightest membranes in the Trade Select range. If the roof needs to dry upward, specify a vapour permeable underlay such as VapourTech Brane VHP.

Why is there a 1200 mm roll?

It suits sarking runs where 1350 mm is more than the rafter spacing needs, so there is less waste on the lap. The 1350 and 1500 mm widths are the general purpose sizes.

What R-value do I actually get?

On its own, not much. Ametalin declare RT 0.93 winter and RT 1.51 summer for an unventilated 22 degree residential roof. Add an R2.7 batt to battened out lightweight cladding and the declared figure is RT 2.75 winter. The foil needs an air gap in front of it either way.

How does it differ from Sarking xR HD?

Sarking xR HD is double sided reflective, so both faces have a low emittance and the declared roof figure rises to RT 1.14 winter and RT 1.82 summer. Sarking HD is single sided with a printed anti-glare face at 0.90 emittance.

Can roofers walk on it?

Sarking is not a working platform and is not a fall arrest system. It is heavy duty and tear resistant, at 586 N edge tear against an 80 N minimum, but safety mesh is what carries a person.