Tree Renewal at Prestigious Victorian School keeps Future Bright for Students

By Kristyn Levis

When one of the schools in Victoria needed to revamp its facilities, the architects had to find a robust soil vault solution that would suit the limited space of the project without compromising soil volumes for the trees.

The Citygreen® modular Stratacell™ system is an all around product that ticked all of the requirements for the tree renewal project at this campus in Keilor East, Victoria.

The Penleigh and Essendon Grammar School project required the redevelopment of the Boys Middle School, which included a new facility and refurbishment to the existing classroom building.

Penleigh and Essendon Grammar is a Uniting Church School for boys and girls with campuses in Essendon, Moonee Ponds and Keilor East in Victoria. The school is the union of Penleigh Presbyterian Ladies’ College and Essendon Grammar School.

Joshua Chia, Senior Landscape Architect from ACLA, was part of the design team for the tree renewal project, including architects from McBride Charles Ryan. The design stage started in mid 2011 and construction began early 2012. The whole thing was completed by July 2013 with a landscape budget of around $400,000.

“The landscape scope included the main entry and courtyard design, providing active and passive recreational opportunities for students while facilitating access between the two buildings,” Chia said.
He added that the tree renewal initially had a double row of avenue of trees centrally within the courtyard to provide shade and cooling from the surrounding hardscape, while strengthening the orthogonal lines of the buildings, designed to reflect the principles of the Roman Forum.

“A super advanced feature tree (Brachychiton acerifolius) was proposed for the main entry as a focal point,” Chia said.

Because of the restricted space of the courtyard and its intended use in facilitating access and providing areas for ball games, Chia said the tree renewal design had to be robust.

“Existing trees planted in small tree pits within the existing courtyard had damaged the pavement and become a safety issue. To allow for trees to be installed within pavement and become a major asset for the space, we felt the Stratacell system was the best solution in providing uncompacted soil around the trees while structurally supporting the pavement above,” Chia said.

Aside from the Stratacell system, the project also used Citygreen’s RootRain Precinct.

The RootRain Precinct and ArborVent kits (New & Improved Tree Grates Here) are for central urban locations requiring a permanent irrigation/aeration solution and heavy-duty cast-iron inlet. The series have been specially designed to interlock with Citygreen’s range of integrated tree grates. This provides a tamper resistant system that will also prevent the inlet sinking as a result of any soil settlement around the tree. Additionally tree guards were added to help protect against vandalism.

“Based on past failures of trees in urban environments and damage to surrounding pavements, it’s proof that adequate soil volumes are very important. While we were unable to achieve the absolute ideal target soil volume on this project due to budget restraints, we saw any significant improvements to the growing conditions as being beneficial,” Chia said.

The biggest issue they faced was designing the tree renewal within such a tight budget. Although they had to substitute materials and treatments, Chia said they were “adamant that the Stratacell system had to go in”.

It’s only been a year since the trees were planted, but Chia said the trees are establishing well.

“We are hopeful that this will continue to be the case for years to come. There is no doubt the Stratacell system provides major benefits over other more traditional systems” he said.

Based on the tree renewal feedback from contractors, Chia said they knew that the system was very simple to install. They had very little issues with the installation and a Citygreen representative was present to help guide the contractors through the installation process.

Chia said they have since incorporated the Stratacell system into a number of subsequent projects.

“The trees are looking great. However, having only been a year, we are sure we will see the benefits in the coming years,” he said.

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