Product Description

The Thermosash Fully Flushed Sealed Joint Cladding-WS1000 suite is an engineered cavity rainscreen cladding system, incorporating a unique cavity creating bracketing system. The suite most commonly utilises ACP (Aluminium Composite Panel) as the rainscreen material, but equally also can incorporate almost any other solid metal or ACP type material, such as a cassette cartridge in zinc, stainless steel, terracotta or powder coated aluminium etc. The WS1000 suite requires a formed air barrier wall (Rigid Air Barrier - RAB) located behind with a suitably considered primary structure (concrete panel, timber or steel framing) to receive the cladding rail system. The system joints are flush sealed with silicone providing the opportunity to overclad buildings and provide a modern sophisticated appearance for a relatively low cost where an existing durable wall already exists. A typical installation will require external access such as scaffolding and is best suited to lowrise applications due to the limitations of RABs in multi-storey applications.

Section Sizes

The designer should allow a zone from the face of the air barrier of 60mm.

Panel size limitations are calculated on the project location (wind zone / seismic), height, primary structure movement calculations (ULS) and eventual material selection.

Performance / Testing

  • AS/NZS1170 (Structural Design Actions)
  • NZS4223 (Glazing in Buildings)
  • NZS/AS4284:2008 (Water / Air Pressure/ Air Leakage)

Maximum Spanning Ability

Thermosash specifically engineers the best suite option for your project taking into consideration span, structural system, and environmental loads (e.g. wind). The spanning ability will vary depending on the above.

Thermosash Suites are recognized as having the largest spanning systems on the market due to our specific engineering capability and the customised nature of the work we complete.


The standard warranty is 5 years from the date of practical completion for these products. This covers workmanship and weather tightness, providing the subcontract includes fabrication, installation and glazing of all components.

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Key Features

  • Fully flush sealed joints.
  • Engineered cavity cladding system.
  • Drained cavity system.
  • Economic refurbishment and overclad solution.
  • Engineered panels ensure longevity from delamination or folded corner metal fatigue.
  • Offers integration with other Thermosash suites and accessories.
  • All projects are in-house engineered and fully shop drawn, reducing the amount of detailing required by the architectural documenter.


We recommend using Masterspec 4251TS Commercial Windows when specifying this suite.

NB: The WS1000 and RS1000 suites both require a fully constructed wall with air barrier installed to a coordinated design. The air barrier wall should include insulation and all flashings required to meet the requirements of the New Zealand Building Code. Due to the limitations of some building wraps to withstand high wind loads,Thermosash recommends a rigid air barrier (RAB) where calculated. Due to the movement such as wind, live loading or seismic that buildings can be subjected to, Thermosash recommends that RAB detailing should compensate for the movement in flashings and fixings so the RAB does not suffer air leakage and therefore potential moisture transfer through rainscreen cladding systems.

CAD Downloads

WS1000 - Fully Flushed Sealed Joint Cladding

Download files


  • Polyester powdercoat - both standard and special colours available
  • Anodised - all anodised colours available - commercial grade 20 Micron finish recommended
  • PVF2 Fluorocarbon finishes - available on request