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48


STRUCTURAL ELEMENTS


Installing modular load-bearing attenuation cells would keep the roof accessible at all times


provide permanent UV protection if the membrane is to be left exposed. Alternatively, mitigated water can be concealed under a raised pedestal and paving system or by the installation of modular load bearing ‘blue roof’ attenua- tion cells, which means that the flat roof can still be used for access and a variety of other purposes. Conversely, a living roof would also temper the amount of water flowing through it while increasing biodiversity.


GREEN & BLUE Adding a living roof would temper the amount of water flowing through a roof while enhancing biodiversity


By far the most important waterproofing aspect to note is that ‘blue roofs’ should be a warm roof construction, and inverted roofs should be avoided. Inverted roofs rely on a water flow reducing layer (WFRL) installed above the inverted insulation to restrict the flow of water, and this is not a waterproofing membrane. Its unsealed laps will not be watertight when a three inch head of water is temporarily retained above. This will result in the calculated thermal performance of the roof not being achieved, higher than expected heating and cooling costs and a poorly performing building. This should be of significant concern to all parties involved.


Go bespoke


K design U-value on a standard inverted roof would require approximately 220 mm of extruded polystyrene (XPS). Whereas on a ‘blue roof’ this thickness would increase to 1000 mm of XPS and a design U-value of 0.12 W/m2 achievable.


Standard thermal calculation methods cannot be used when designing an inverted roof with ‘blue roof’ finishes. For example, a 0.15 W/m2


K could not be


In conclusion, because every building is different, it is a key maxim to remember that a bespoke engineered drainage strategy must be designed for every project. The specified waterproofing system must be robust, and installed to the highest quality standards. And, as stated earlier, the roof should be a warm construction and inverted roof designs avoided.


If these three basic principles are followed, I believe we can quickly achieve a successful national strategy for sustainable and affordable flood mitigation at roof level.


Phillip Wilcox-Moore is managing director at Axter


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SG4 FREESTANDING GUARDRAIL SYSTEM


 Unique patented lifting shoe  Safe, secure and cost effective flat roof edge protection


Please visit our website or call Whelan Plant:


Tel: 01959 571788 Fax: 01959 571068 Email: info@shorguard.co.uk www.shorguard.co.uk


A DIV OF JP WHELAN & SONS (CONSTRUCTION) LTD UNIQUE LIFTING SHOE SG1 SG2 SG3 SG4 PERMANENT TEMPORARY SHORGUARD EDGE PROTECTION SYSTEMS WWW.ARCHITECTSDATAFILE.CO.UK ADF JUNE 2017 SG4


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