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Exteriors


A functional and aesthetic facade for an award-winning building


TECHNICAL CHARACTERISTICS Raw material:


ALU EN 1050 H14/H24 Pattern: LTH200x76x30x3 & RMIG ImagePerf Thickness: 3.0 mm


Finishing operations: Bending Surface treatment:


Powder coating (Syntha Pulvin Anodite 547)


visitors and residents, with a pedestrian plaza, retail space and a bus station. The single largest element of the project is the 1,000-space six-level multi-storey car park.


A


vast regeneration project for Lincoln City Centre has resulted in a modern and effective transport hub for both


The facade of the car park has been created with 3,600 m2


of expanded metal and 400 m2


of perforated sheets, with the Lincoln coat of arms and fleur-de-lis reproduced on to the perforated panels by means of RMIG ImagePerf technology. The inspirational style of the building and


its architectural merits have resulted in the award for Best New Car Park at the British Parking Awards. For further information or if you are


interested in our CPD presentation ‘Perforation in Architecture’ contact info.uk@rmig.com.


01925 839610 www.city-emotion.com


Blue roof design considerations after BS 6229:2018 update


N


igel Blacklock, technical director at Bauder, and Chris Roddick, green and blue roof product manager for


Bauder, discuss the changes in the BS 6229:2018 update that impact rooftop water management solutions.


Chris, tell us about Bauder’s rooftop SuDS system, BauderBLUE Chris: BauderBLUE is a blue roof system which attenuates heavy rainfall and controls its discharge over a 24-hour period to tackle standing water and flash flooding in built up areas.


How will the revisions in BS 6229 update impact the design considerations for a BauderBLUE roof? Chris: The 2018 update clarifies and reinforces the meaning of a zero falls roof used in most blue roof systems. A zero falls roof is defined as having no more than a


1:80 fall, but more importantly the roof must not have any back falls away from outlets. This will mean all back falls must be corrected with localised latex screed or additional outlets.


Nigel, what structural considerations are required when thinking about zero falls on a blue roof? Nigel: A detailed structural analysis of the deck should account for construction tolerances, settlement and deflection under load with a concrete slab level survey carried out to identify any back-falls prior to the waterproofing being installed. Hence the advice “design a fall of 1 in 80 to achieve not less than zero”, starting at zero inevitably will lead to back-falls.


How does the thermal performance update apply to a blue roof? Chris: The U-value achieved in an inverted roof greatly depends upon the amount of


water that passes through the joints of the insulation and sits on the waterproofing, as this will cause rainwater cooling. This has a negative effect upon the roof insulation value. Nigel: There is now a note that suggests


that not less than 10 per cent is added to the thickness of the insulation to take account of rainwater cooling. However, water on an inverted blue roof might sit on the waterproofing for longer and with a greater depth, BS6229:2018 states no correction factor should be used which will lead to much thicker insulation than is currently used. BauderBLUE is supplied as part of a full


Bauder roofing system and therefore has a single point warranty.


0845 271 8800 www.bauder.co.uk


1 www.buildingconstructiondesign.co.uk 2


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