72 LANDSCAPING & EXTERNAL WORKS; STRUCTURAL ELEMENTS
we have for minimising disruption to residents. Permeable paving works by allowing water to pass through it, rather than running off onto the surface and into the sewer system. Immediately, this decreases the amount of water fl owing into a sewer system, reducing overfl ow. Permeable paving can also help to improve water quality by reducing the amount of pollutants that are washed into the sewer system. This is because permeable paving allows water to fi lter through the aggregate packing and silt, which helps to remove pollutants. There are several different types of permeable paving available, including porous asphalt, concrete pavers, and interlocking concrete pavers. The type of permeable paving that is best for
a particular application will depend on a range of factors, including the amount of traffi c that the paving will be subjected to and the climate, and that correct installation is key to success. If it is not installed properly, it may not be effective in preventing sewer overfl ows or improving water quality. Finally, because we are living in a time where project managers are under pressure to carefully manage budgets, retrofi tted SuDS systems are a good way to help save money by reducing the need for expensive installation of conventional stormwater drainage systems, which can often involve ground engineering. When done well, SuDS can help to reduce the risk of fl ooding from rain and stormwater on a site and the
risk of sewers being overwhelmed, by reproducing natural processes for irrigating water. The new requirements placed on housebuilders and developers from 2024 means there has to be more thought about how water moves around a site, and how it can be controlled, but the systems and expertise are already on hand and ready to assist the approach to a new era of SuDS management. A good recent example is Brett Landscaping’s work with Severn Trent Water on a £76m project to reduce the fl ood risk on residential estates in Mansfi eld. Severn Trent and local authorities are working on retrofi tting a series of SuDS measures across the town including bioswales, detention basins, raingardens, and approximately 50,000 m2
of Omega Block permeable paving.
art of the sustainable fl ood resilience proect involves retrofi tting permeable paving, within highway land such as residential parking areas on residential estates to tackle the runoff of surface water. The permeable paving has been designed as either infi ltrating with a geotextile base or noninfi ltrating with an impermeable liner with a return to the sewer system.
Jamie Gledhill is engineering technical manager at Brett Landscaping
Wraptite® is the solution for Dundee young persons’ home
The Wraptite external air barrier system from the A. Proctor Group has been chosen for its high performance airtight insulation for a new home for young people in Dundee, Scotland. Robertson Construction Tayside secured the project as part of a direct award through Places for People Procurement Hub Framework. The specification created by Dundee City Council Architects for the project was to use materials to achieve high value performance and help achieve good airtightness. Robertson Construction Tayside appointed Robertson Timber Engineering as the timber frame manufacturer and supplier for the project. Nicola Jackson, net zero projects lead at Robertson Group explained: “We fitted the Wraptite membrane in our factory in Elgin. A very helpful toolbox talk and practical demonstration was delivered by the A. Proctor Group representative to operatives and the design team prior to developing detailed design information.” “Installing the product at low level in the factory allowed the membrane to be more easily applied and avoided the risk of working at height. The factory installation also enabled the product to be installed in completely dry conditions to ensure full adhesion in a quality-controlled environment to deliver the required airtightness requirements. The product is very durable and provides excellent protection, reducing any risk of damage on site.”
01250 872261
www.proctorgroup.com Mapei protects new homes in historic building conversion
A Mapei waterproofing membrane & watertight concrete system has been designed by Lainton Services, Stockport as part of a sympathetic conversion of a former medical Centre in Altrincham, Cheshire. The Mapei system was installed within basement areas, by Lainton Services, with components supplied by Kestral Construction Products. Two Mapei pre & post applied HDPE (High Density Polyethylene Geomembrane) waterproof membranes were used to protect the underground structure of the building: Mapeproof AL AP was applied before concrete was poured and Mapeproof AL 1200 AP was applied afterwards. The robust membranes are highly resistant to puncturing, tearing, natural elements and UV rays, and they provide a barrier against groundwater, soil moisture, radon and methane gas. On contact with concrete, the system forms a permanent, tough bond. The system also included Mapei’s watertight concrete admixture Idrocrete KR 1000: a powder admixture made from special hydrophilic components that reduces the permeability of hardened concrete which was supplied by Cemex – along with Mapeproof Liquid Membrane: a two-component polyurethane elastomeric, thixotropic, liquid waterproofing membrane.
info@mapei.co.uk www.mapei.co.uk WWW.HBDONLINE.CO.UK HBD02_Mapei_Structural Elements - Water & Damp
Proofing_DPR.indd 1 12/02/2024 08:56
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