Canon Green Court
Salford, Manchester, England
What we did
Stephen Martlew Landscape Architecture specified the tree pits to incorporate Green-tech’s Geo-Cellular Raft System, a geo-cellular tree pit solution that enables the use of a good quality, friable, organic soil within the tree pits, as opposed to structural tree sand.
The landscape contract work was awarded to Beech Landscape (Developments) Ltd, with whom Green-tech Specifier have a twenty-year working relationship. Nick Abbott, founder of Beech Landscape had used the Geo-Cellular Raft system before and appreciated the benefits of having a tried and tested system to work with.
The area above the trees is a block-paved extension of the pavement alongside a busy main road. It is therefore imperative that a system was put into place that protects the soil below from compaction whilst supporting the paving above; at the same time without encroaching on underground service lines or filling the rooting area with plastic.
Green-tech’s Geo-Cellular Raft System is a highly rigid, yet shallow sub-base replacement, capable of supporting up to 70 tonnes per square metre. Requiring a mere 500mm wide shoulder around the edge, it acts as a raft, spanning the tree pit or trench without any plastic encroaching into the rooting zone. Using recycled polypropylene with a 95% void ratio, it also acts as an air void, bringing aeration closer to the roots.
One of Geo-Cellular Raft System’s key advantages over traditional deep pit crate-style systems is the 150mm shallow profile. This came into its own when the installation team discovered a plethora of Victorian pipework less than half a metre underground. Nick stated that if they had been using a crate-style system, it would have given them a real headache and taken a lot longer to install.
Each tree within the trench was completed with Mona irrigation tanks, tree anchors, and over 120 tonnes of Green-tech’s Green-tree British Standard subsoil and specially formulated Geo-Cellular Raft System topsoil, to give the trees the best chance of establishment.