GREEN & BLUE INFRASTRUCTURE
A Blue Green roof completed with RoofBloxx
EARLY ENGAGEMENT DURING BLUE / GREEN ROOF CONSTRUCTION ESSENTIAL FOLLOWING MAYOR ELECTIONS
Following Mayor of London Sadiq Khan ’ s pledge to increase the number of green roofs in his reelection manifesto , architects , engineers and contractors are being urged to ensure designs meet both performance needs and British standards .
Urban greening projects are expected to increase across the UK , following changes to local and national planning policies . One of the key challenges in constructing blue / green roofs , according to ACO Building Drainage , is meeting the needs of the Building Regulations , required standards – BS EN 12056- 3:2000 and BS6229 : 2018 – and achieving effective rainwater retention .
Currently , as blue / green roofs are flat , they are required to meet the British standards for gravity drainage on flat roofs . However , while traditional flat roofs are designed for water to quickly drain in the event of heavy rainfall , a blue / green roof retains water for 24 hours or more meaning the primary drainage functions are not the same . As such , there is increased risk of flooding if attenuation systems are incorrectly specified and not maintained .
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