Triple Glazed Units (TGU) with 2x LowE Plus coatings and warm edge spacers. Clarity, High Visible Light, Ultimate Insulation.


  • Outer: 6mm Clear Toughened
  • Spacer: Warm Edge Spacer with Argon Gas
  • Mid: 6mm LowE Plus Toughened
  • Spacer: Warm Edge Spacer with Argon Gas
  • Inner: 6mm LowE Plus Toughened

Site Address

Toorak, VIC 3142


Tasman Windows & Joinery (TAS)


Wardle Studio

Photos courtesy of

Dianna Snape



Dual passions for sophisticated contemporary architecture and forward-thinking environmental practices informed Wardle’s design of Limestone House.

The Toorak property shares many qualities with other exceptional homes in its elite Melbourne suburb, including outstanding design integrity, materials and detailing.

Where it sharply diverged, however, was in the strength of its owners’ ambitions for sustainability and healthy living, resulting in a home that generates, captures and provides everything it needs on-site and minimises its environmental impact.

The Wardle team implemented two complementary and voluntary standards to achieve their clients’ goals.

Architect Diego Bekinschtein says the main driver of the design was the Living Building Challenge (LBC) which mandates the use of sustainable local materials and an off-grid approach to energy and water management.

The architects then dovetailed the LBC with Passivhaus principles, which focus on creating an exceptionally high-performing, uninterrupted building envelope to create a comfortable living environment using minimal energy.

As the LBC requires strong links between a home and its natural landscape, Diego says they considered how to bring the landscape deep into the house’s footprint. The home’s largest opening is a central, shaded courtyard drawing natural light, ventilation, and the winter sun to its heart.


To meet the dual standards of strong landscape connections and a high-performance building envelope, Diego says they needed to triple-glaze the courtyard and it was more effective to extend this protection across the house.

“Triple-glazing is uncommon in Australia, but in this case, the glass had to work harder to achieve the courtyard and meet Passivhaus standards.”

Wardle Studio worked with Tasman Windows & Joinery (based in Hobart, TAS) to find a quality window and door solution for the Limestone House, which meets both the Living Building Challenge (LBC) and Passivhaus standards. German Passivhaus thermal break aluminium window/door systems were sourced from Schüco through Capral Aluminium and fabricated by Tasman Windows. The AOC 50 TI.SI system combined with Recycled Blackbutt Timber was used for the curtain walls and rooflites, and Schüco AWS 90.SI+ system was used for the tilt & turn window/door openings. For the sliding doors Tasman Windows custom made Recycled Blackbutt Timber lift & slide doors with German hardware. Australian Glass Group manufactured and supplied the triple glazed Insulglass LowE Plus® units that meet the Passivhaus standards for the project.

“Greg Sheedy and his team run a very sophisticated operation. We were inventing systems, and it was vital to collaborate with the best people to design and produce the windows.”

Diego says Passivhaus homes are traditionally simple and compact to meet exacting principles. However, this house needed to push boundaries architecturally, with windows designed as portals to define views. One double-storey window provides scale and frames the view to an existing mature Chinese elm.

“The home’s windows also provide a visual generosity – for instance a private guest realm upstairs has a complete wall of glass looking onto the deck and back onto the house.”

Diego says more clients now have environmental agendas.

“It’s important to have clients who champion the environment and are prepared to take the journey.”


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