Product Description

Thermosash PW40 :  is a four sided mechanically glazed engaged curtainwall, that is; expressed horizontal transom elements and vertical mullion elements - offering a similar appearance to the high performance PW400.

This unitised curtainwall suite is suitable for low or high rise applications where small spans or where smaller panes of glass are envisioned. The PW Series Suites have been extensively used and proven in New Zealand and our export markets since 1985. 

Section Sizes

  • 75 / 100mm Mullions
  • 75 / 100mm Transoms


Maximum spanning ability

The spanning ability will vary depending on the structural system and environmental loads (e.g. wind).  Thermosash specifically engineers the best suite options to meet project requirements.

PW40 is best used for:

  • Lower floor to floor heights - greater heights are achievable with our PW400 suite
  • Sites with low wind loads
  • Smaller module sizes
  • Areas where there is low building movement

We recommend discussing your project with us early so that we can advise on the best suite solutions for your needs - please contact us.

Pressure equalised design

The weathering design of these curtainwall suites follows recognised international curtainwall design principles - rainscreen pressure equalisation and system drainage - which requires primary and secondary weathering. 

All internal cavities of the system are designed to be pressure equalised (i.e. no pressure differential between the outside face and any internal cavity). This feature allows the water which penetrates the rainscreen to drain and maintain ventilation. The rear air seal is critical to the system's weathering performance as air infiltration acts as the medium which transports water through to the building's interior, i.e. it is the prime cause of any leakage.

Non-vision rainscreen areas act as a primary water-stop, the second airseal and cavity acts as a backup to collect and drain away any water that manages to penetrate the primary rainscreen barrier, with an integral structural backpan.

Integrated Elements

Almost an unlimited type of materials can be integrated into a unitised panel, including different glass types, metals, brackets to receive externally mounted fins, louvres, venetians or building signage for example. 

Low-Carbon Aluminium

Thermosash partners with a local NZ-owned extruder achieving a lower carbon footprint than the global average - offering reduced upfront carbon emissions. (find out more about our Sustainable Aluminium).

Performance / Testing

Thermosash owns and operates the largest façade testing facility in New Zealand where we test our systems and custom designed suites to ensure compliance with the below codes or project specific requirements:

  • AS/NZS1170 (Structural Design Actions)
  • NZS4211 (Performance of Windows)
  • NZS4223 (Glazing in Buildings)
  • NZS/AS4284:2008 (Water / Air Pressure/ Air Leakage - Meets and exceeds minimum requirements)

All the Thermosash suites are independently laboratory tested to IANZ (International Accreditation New Zealand). Test certificates are available on request.


The standard warranty is 10 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, and the maintenance schedule is adhered to.


Maintaining glass, metals and stone are all particular to the environment that they are placed in: eg. marine, environmental pollution, exposure to natural washing, etc.

It is recommended by almost all material suppliers that building washing should occur every 3-6 months to prevent staining to glass and prevent environmental pollutants from corroding metals and to maintain the material warranties.

A full maintenance manual is provided on completion of a project for all the elements integrated within a project. Compliance to a maintenance schedule is essential to maintaining the quality of the installed product over time. Using Thermosash-approved facade maintenance contractor/personnel ensures the highest standards are met.

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Key Features

This engineered façade product is designed to accommodate:

  • building movements - both vertical and horizontal (seismic)
  • Allows for differential rates of thermal expansion and contraction
  • Connection details to accommodate construction tolerances
  • Structural member strengths comply with Code or project specification
  • Glass design and it's integration with the glazing system to ensure glass warranties are complied with


We recommend using Masterspec 4211TS Curtainwall when specifying this suite.

CAD Downloads

PW40 - 100mm Mullion Single Glazed

Download files

PW40 - 100mm Mullion Double Glazed

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PW40 - 100mm Mullion Fixing Bracket - Slab Top Mount

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Thermosash Curtain Wall Fixing Bracket

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

Relevant Projects

Vector Arena

Vector Arena


Crawford Architects

Mainzeal Construction


Constellation Bus Station

Constellation Bus Station


NZ Transport Agency

Brosnan Construction


Rangi Ruru Girls School

Rangi Ruru Girls School


McIldowie Partners Architects

Leighs Construction


Novotel Christchurch Airport Hotel

Novotel Christchurch Airport Hotel


Warren & Mahoney Architects

Fletcher Construction


UOA Parkwest 507

UOA Parkwest 507





Downer Head Office

Downer Head Office


Aqua Ltd

Naylor Love


Upper Hutt College

Upper Hutt College


Stephenson & Turner

Mackersey Construction