Long-Term Performance: Durra Panel in a Mid-Century Classic

High above the Yarra River in Kew, Melbourne, Peter McIntyre’s Butterfly House has been a landmark of Australian modernist design since it was completed in 1955. Recognised for its distinctive butterfly-shaped roof and lightweight steel frame, the River House was built high above the site to protect against Yarra River floods and designed to maximise views, natural light, and connection to the surrounding landscape.

Among its innovative material choices was the use of Durra Panel for internal wall and ceiling linings. This early residential application showed how Durra Panel could provide both performance and practicality in a home that was ahead of its time.

Durra Panel brought several benefits to the Butterfly House. The dense straw core provided natural thermal insulation, helping to keep the interior comfortable year-round despite its elevated, exposed location. It also improved the home’s acoustics, reducing echo and sound transmission within the open-plan spaces. These qualities made it a smart choice for a house designed with large volumes and minimal interior partitions. To help safeguard the house from moisture and environmental exposure, the panels were finished with a water-resistant coating, ensuring their longevity while maintaining performance over decades.

What’s most impressive is how well Durra Panel has lasted. Independent testing by RMIT has shown no decline in performance in panels that have been in use for decades, proving their long-term durability. Durra Panel’s Environmental Product Declaration also notes a service life well beyond 50 years, with minimal maintenance required, something the Butterfly House continues to demonstrate almost 70 years later.

The Butterfly House remains one of Melbourne’s most recognisable mid-century homes, and Durra Panel is part of the reason it has stood the test of time. Its longevity, combined with its thermal and acoustic benefits, makes it as relevant for residential projects today as it was in the 1950s. Peter McIntyre now resides in the house, a testament not only to its enduring design but also to the lasting performance of the materials that make it a comfortable and resilient home.

Architect: Peter McIntyre – McIntyre Partnership