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86 LANDSCAPING & EXTERNAL WORKS


The future is permeable


N


ew legal requirements for Sustainable Drainage Systems (SuDS) on developments across Wales apply


from January, heralding wider use of concrete block permeable paving. Meanwhile, the trade association Interpave has published the new Edition 7 of its definitive guidance to this essential SuDS technique – ‘Design and Construction of Concrete Block Permeable Pavements’ – now available to download from www.paving.org.uk. The Welsh Government has now implemented Schedule 3 of the 2010 Flood and Water Management Act. This includes the establishment of a SuDS Approving Body (SAB) within each local/unitary authority, alongside its lead local flood authority duty. SAB approval will be required before construction of drainage systems can commence on new and redeveloped sites. The Welsh National Standards point out


that: “The SuDS approach mimics natural drainage, managing surface runoff at or close


Clearstone resin bound paths


The contemporary homes in this North London residential development are linked by undulating walkways – one of which leads onto Hampstead Heath. The discerning homeowners wanted the original worn tar and chip replaced with a light, flexible surface that would look beautiful, feel comfortable to walk on and last a long time. With 20 apartments, there were quite a few clients to please. Clearstone installed resin bound test patches of 1.5m2 in four different colours and the residents chose Bronze Trio. Clearstone laid 705m2


over the existing pathways


to a thickness of 18mm and, for a clean sharp finish, Clearstone edged the paths with aluminium AluXL. Durable and long-lasting, Clearstone resin bound is a water-permeable SuDs compliant surface, so there’s no puddling, low maintenance and it’s easily cleaned with a quick power-wash. Clearstone uses only the highest quality resins and aggregate blends, so their paving won’t crack or fade and, because they formulate their own BBA certified product ClearBound, they offer a 10-year guarantee. “Everyone is happy. It looks 100 times better than before and the Clearstone people were very professional and helpful,” says residents’ management committee members.


01273 358177 www.clearstonepaving.co.uk


Lightweight grassroof alternative The new Grassroof®


Grassroof®


to the surface and as close to its source as practicable, controlling the flow… and providing a range of additional benefits.” By its very nature, concrete block permeable paving is uniquely placed to meet these requirements, as an attractive, surface-based, multifunctional SuDS technique. Interpave’s new ‘Design and Construction


of Concrete Block Permeable Pavements’ guidance covers the most recent permeable paving techniques, such as overlays to existing


road constructions and enhanced, predictable water storage using flow controls. It can be downloaded from Interpave’s new website www.paving.org.uk – an essential resource covering all aspects of design with precast concrete paving, including an inspirational project gallery and case studies, supported by background information for all design stages, as well as for CPD.


0116 232 5170 www.paving.org.uk


is an overlay paving system that can be applied to new or existing flat roof structures. can be used as an extensive or simple-intensive paving layer, or as a base layer for intensive roof


designs. Grassroof units interlock together and can be laid either directly onto the roof membrane or via a foil backed polystyrene underlay. A key element in simplifying the installation is the use with a Regarm moisture retaining blanket. The specification of Regarm will enable the omission of a soil layer reducing the volume of heavy bulk materials during installation. Grassroof®


with a simple “leave and lay” format incorporates sedum


turf; no soil is required, and these succulent plants can store moisture. When installed, the lightweight system weighs as little as 4.39kg/m² providing an easy to install and maintain green solution. Grass Concrete Ltd has over 40 years of supply of environmental construction products: ground level permeable grass paving Grasscrete, Grassblock and Grassroad, vertical landscaping BetoConcept and now a new Grassroof product.


01924 379443 www.grasscrete.com


WWW.ARCHITECTSDATAFILE.CO.UK


ADF JUNE 2019


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