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Weather Defence Rigid Air Barrier

SINIAT Weather Defence is a weather resistant, highly breathable rigid air barrier (RAB) that is also non-combustible, vapour permeable and doubles as a fire-resistant board to provide a fire barrier between the façade and the interior. Providing better weather resistance than pliable alternatives it also equalises air pressure within the outer wall cavity to prevent water ingress. It requires no additional sarking due to its patented hydrophobic core and integrated liner and it can be exposed to weather for up to 12 months prior to being over-clad, offering early access for internal trades.

Four-in-One Solution

SINIAT is fire resistant, non-combustible, vapour permeable and weathertight all in one product. Eliminating the need for a breathable membrane saving time and reducing installation cost.

Air & Weather Tight

Along with the proprietary joint sealing system, SINIAT is extremely airtight with leakage of 0.002m3/m2/hr for compliance with the NCC 2019 air leakage requirements for class 2-9 buildings.

Breathable Barrier

SINIAT is highly breathable at 0.49 MNs/g or 2.04 µg/N.s allowing water vapour to escape the cavity and helping to control moisture build up, unlike other non-permeable back pan methods.

Up to 1yr Exposed

SINIAT can be left exposured to the weather for up to 12 months before cladding is installed allowing early lock up and start of internal trades and linings as building is weather sealed.

FRL Testing

SINIAT solutions offer fire resistant wall systems up to 60/60/60 which satisfy Deemed-to-Satisfy compliance for vertical & spandrel fire separation between floors and openings

Patented Technology

SINIAT is weathertight with no need for additional sarking thanks to a patented hydrophobic core and glass matt liner technology. Propietary joint jape must be used on all joints, corners and openings.

Manufacturer's Warranty

SINIAT is manufactured by Etex Group, one of the largest supliers of construction materials globbally and it comes with a 12 year warranty when installed by a certified installer.


SINIAT is deemed non-combustible according to C1.9 of the BCA/NCC 2019 and can be used in any cladding or lining application where non-combustible materials are required.






Lead Time


SWD2412 SINIAT Weather Defence Board, 2400 x 1200mm Stock 1 Sheet
SWDS60 SINIAT Weather Defence Sealant, 600ml Sausage Stock 20 Sausages
SWDM38 SINIAT 38mm Self Drilling Metal Screw, 1000 Pack Stock 1 Pack
SWDT42 SINIAT 42mm Wet Area Timber Screw, 1000 Pack Stock 1 Pack
TAPES INSULTAPE Full Range of Specialised Tapes - See Page 22 Stock 1 Roll


Technical Data

Test Item



Material Density Kg/m3 860
Reaction to Fire EN 13501-1 A1
Non-combustible (DtS) C1.9(e) Pass
Resistance to Mould Growth ASTM 03273 Pass
Thermal Conductivity W/mK 0.25
Thermal Resistance R-value 0.05
Water Vapour Resistance MNs/g 0.49
Water Uptake (2hrs Immersion) EN 520 <3%
Water Absorbtion (2hrs Cobb Test) g/m2 <100
Dimensional Change mm/m <0.11
Flexural Strength N >310
Elastic Modulus MPa >3150
Impact Resistance EN 15283-1 GM-I
Compressive Strength N/mm2 9



  • Product Brochure
  • Technical Manual
  • Draft Specification
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  • CAD Install Details
  • Testing & Certification


Customer Support

For same day project quotations and technical support please contact our sales team directly on the below contact details. All our sales and technical staff are locally based so we can provide the best possible service and support for your project. You can also request a technical data sheet or project quotation using the below email links;

Building Supplies Manager

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Frank Kutra
Building Supplies Manager
08 9451 2344
0477 966 027
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