Landscaping & External Works
Paving Feature
Research has shown that permeable paving does not suffer from the root damage commonly experienced with impermeable surfaces near trees
sweeping tree debris and vegetation from the surface and leaf fall in the autumn. Tree roots have continued to grow within the permeable pavement sub-base but – importantly – there have been no visible signs of block rutting or liſting, or roots coming through the surface – and there is plenty of international research supporting this benefit.
REGENERATION AND RE-USE As well as new construction, concrete block permeable paving can also be used as an overlay, regenerating and re-using existing, conventional road bases or other hard surfaces, as well as their embedded carbon. Tese thin overlays create attractive, safe and sustainable shared-surfaces that can supply a gradual flow of clean water horizontally into rain gardens or bioretention areas with trees and other green infrastructure, to store water for irrigation, biodiversity and SuDS. Tis approach is exemplified in Bridget Joyce Square, London, an important,
award-winning regeneration project. Here, a typical, adopted asphalt street and adjacent parking areas were transformed for community use with CBPP overlay shared surfaces and tree-planted rain garden basins – an exemplar for future urban landscapes. Te basins provide water storage for SuDS to reduce overloading existing drains, as well as for irrigation. Interpave revisited the project in August 2021, around 5 years aſter completion, and noted that trees and other green infrastructure were healthy, substantial and particularly well- established. Te permeable paving is also performing well and, it is understood from local sources, experienced no problems during this year’s extreme summer storms, despite extensive flooding nearby.
Concrete block permeable paving in harmony with trees at Martlesham Park and Ride Chris Hodson is consultant to the trade association Interpave.
54 | HMMFebruary/March 2022 |
www.housingmmonline.co.uk
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