Glass Balustrades / Barrier Protection

Whether is is a cantilevered glass balustrade or a stanchion supported barrier system, Thermosash can undertake your project's custom engineered barrier design solution - all engineered to allow for specified loading's, including extreme loading's that can be imposed in crowd or public areas.

Over the years the standards and building codes have changed to increase barrier loading requirements for glass balustrades and barrier supporting structures used in and around buildings. The revised standards address barriers and glazing safeguarding a fall of 1m or more.

This is fully explained in the following document from the department of Building and Housing 'Guidance on Barrier Design' and can be downloaded from the following link Guidance on Barrier Design - March 2012 also refer GANZ (Glass Association of New Zealand).

We can assist in the total supply to install process, engineering your concepts in either cantilevered, face fixed, baluster styles or frameless (no top or balusters), all to the highest ratings required and independent certification where requested, including consideration towards system redundancy in case of spontaneous glass failure (refer - Nickel Sulfide Inclusions).

With our in-house glass and structural engineering capability we can manufacture practically any design including unique site-specific fixing methods in glass (including curved), aluminum, stainless steel or industrial paint coated steel where necessary, providing a durable maintenance free barrier solution. 

The Key to barrier design is to first understand the occupancy type for the barrier location and the following brief from AS/NZ 1170.1:2002 provides a guide. Once occupancy is defined the appropriate loading can be applied to calculate the appropriate glass and frame system to resist the proposed loads;

Excerpt from code:
A Domestic and residential activities All areas within or serving exclusively one dwelling including stairs landings etc but excluding external balconies and edges or roofs see (C3)
C1/C2 Areas with tables or fixed seating - Areas with fixed seating adjacent to a balustrade, restaurants, bars etc.
C3 Areas without obstacles for moving people and not susceptible to overcrowding – Stairs, landings, external balconies, edges of roofs etc.
C5 Areas susceptible to overcrowding – Theatres, cinemas, grandstands, discotheques, bars, auditoria, shopping malls (see also D), assembly areas, studios etc.
D Retail areas – All retail areas including public areas of banks / building societies, (see C5 for areas where overcrowding may occur).

Many barriers require specific design and Woods Glass and Thermosash technical support team can help so the barrier system can be engineered accordingly and manufactured and installed as a complying design.

We also manufacture and install proprietary cantilevered glass and channel systems.

  • Category
    Glass Balustrades
  • Proprietary cantilevered channel balustrade systems available.
  • Customized barrier systems.
  • Specifically engineered to suit your projects needs.
  • Full engineered system - including glass, fixings, primary and secondary systems.

Section Sizes

Specific Engineered Solutions - due to the fully customized manufacturing nature of this product please call us to discuss your project brief.

Surface Finishing 

With the many products that we can engineer, and manufacture surface finishing will be specific to your project's needs. 

Stainless Steel - For all exterior applications we use only 316 stainless steel for all fixings, handrails, bracketry and secondary structure. 

Steel - Where steel is proposed we recommend an industrial paint system is specified to provide certainty on durability.

Aluminium - when specified the below surface finishes can be applied:

  • Polyester powdercoat - Both standard and special colours available.
  • Anodised - All anodised colours available - commercial grade 20 micron finish recommended.
  • PVF2 Flourocarbon finishes - Available on request.

Performance / Testing

  • AS/NZS1170 (Structural Design Actions)
  • NZS4223 (Glazing in Buildings)

We can also undertake specific element analysis on bespoke brackets etc to support compliance with the above codes - please ask us about this service.

Maximum Spanning Ability

As we specifically engineer all projects - we can assist in maximizing spans to suit your project or find an economical balance between structure and glass strength.


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. 


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

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About the

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Thermosash is New Zealand’s largest commercial window, curtainwall, total clad façade designer, manufacturer and contractor - local since 1973.               

As a world class supplier of engineered façades, we provide, through constant evolution of our product range, systems that are trusted and proven.

“Our work at Thermosash is critical to the building industry. Our prefabricated design specific engineered building envelopes shape the appearance of our skylines: offering comfort to occupants from heat and cold, protection from the elements, respite from the acoustic discomfort of busy cities and pleasure to those who appreciate the built environment”. David Hayes, Group Managing Director.

Our growth since 1973 demonstrates that the strength we offer the building industry is underpinned by supplying quality, long lasting, engineered building envelope systems. Our ability to meet tight lead times and on-site programmes, our acceptance of transfer of design responsibility, our engineering, manufacturing, logistics and on-site capabilities, together with our team’s passion and quality service commitment enables us to remain at the forefront of the facade subcontracting industry.

Our Expertise
Thermosash’s abilities have grown since its 1973 start-up when Laurie Hayes and his colleagues manufactured commercial windows out of a small production facility. It quickly became apparent that the products and skills of the workforce were creating a performing quality, flexible product that the market sought.

Over time, our teams of dedicated and committed people have grown, this has been possible through constant reassessment of internal and external processes and manufacturing methods from around the world. We’ve also provided ongoing reinvestment in the training of our people to ensure lean process, IT Systems, material handling machinery and transport logistics equipment, as well as design office and factory production process improvements. We are able to offer a world class company with manufacturing facilities in Auckland, Wellington and Christchurch.

Our Offering
We offer an extensive range of cost effective, high performance rainscreen, pressure equalised window, door and façade solutions to suit any commercial project. Our products are incorporated in high-rise office blocks, apartment buildings, shopping centres, airports, institutions, hotels, industrial complexes and quality architectural homes.

In addition to offering bespoke façade solutions for new builds, we are experts in recladding, rainscreen over-cladding and the refurbishment of existing façades.