ASK THE EXPERT


Reaching new


heights


OK, HOW DO I MAKE SURE PAVING IS PERMITTED? Interpave’s ‘Paving for Rain’ guide offers two straightforward methods: Concrete Block Permeable Paving – which allows rainwater to filter through grit-filled joints between the blocks into a sub-base below with enough space to store the water for a short time. Rain Gardens – where conventional paving simply drains to a landscaped depression, maybe with plants, in the garden to temporarily hold water.


In both systems, water is held back on your property during heavy storms to avoid flooding, and filtered to remove or trap pollution. What happens next depends on the ability of the ground to absorb water (known as ‘permeability’) and whether you want to recycle the rainwater.


HOW DOES PERMEABLE PAVING WORK? There is a wide choice of products available from Interpave manufacturers, specifically for permeable paving – with more shapes, styles, finishes and colours than ever. They are said to have the same performance as conventional concrete blocks and slabs: slip resistant, durable, strong and sustainable. The difference with permeable paving is the presence of


larger joints, which are filled with stone grit (but never sand or mortar). This ensures that water will continue to pass through the joints over many years. Concrete block permeable paving can be laid level and still avoids puddles without the need for drainage gulleys and pipes. It also provides a safe surface for all homeowners, unlike gravel and other loose material.


Chris Hodson is an architect and consultant to the trade association Interpave


april/may 2020


If you are looking for a green roof system, which in addition to new-build projects can be retro-fitted to any flat roof, Grassroof provides an environmental, modular and soil-free solution.


Talk to the experts. Grassroof is part of the


Grass Concrete Limited product range. Leading the development and supply of environmental solutions for almost 50 years.


Grass Concrete Limited


Duncan House, 142 Thornes Lane, Thornes, Wakefield, West Yorkshire WF2 7RE England


info@grasscrete.com Tel: +44(0)1924 379443 Fax: +44(0)1924 290289 @grasscreteworld


Innovative environmental solutions


www.grasscrete.com www.sbhonline.co.uk


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