PROJECT SHOWCASE
The benefits of permeable paving for trees while retaining accessibility for all are recognised by the current Code of Practice for accessibility in the external environment , BS 8300- 1:2018 , which states that : ‘ Tree grilles should be avoided . Smooth or paved permeable surfaces should be used wherever practicable ’. Permeable paving can be laid level and still avoids puddles without the need for drainage gulleys . It provides a safe , firm , pot-hole free surface for everyone – including wheelchair users and people pushing prams . Two decades of experience in the UK demonstrate the long-term performance of CBPP with minimal , if any , maintenance .
No Conflict with Trees Urban trees and paving have traditionally been seen as in conflict but this is not the case with concrete block permeable paving . Unlike conventional impermeable hard landscape materials , permeable paving allows the same pattern of run-off transfer to the ground as natural vegetation , allowing water – and also , importantly , air – to reach tree and shrub roots , while still providing an attractive hard surface above . Also , research has shown that permeable paving does not suffer from the root damage commonly experienced with impermeable surfaces near trees .
Interpave is currently exploring new ways of applying this technology to optimise gradual supplies of water for tree irrigation at where needed , as well as effective interaction with tree pits and proprietary tree planter systems . Paving layouts are also being considered to maximise the permeable paving catchment area for summer irrigation , particularly outside the protective tree-canopy zone . Interpave would be pleased to hear from anyone considering integrating permeable paving and trees on projects ( email : chris . hodson @ paving . org . uk ).
To download Bridget Joyce Square and other project case studies , and guidance on all aspects of permeable paving and SuDS visit : www . paving . org . uk
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