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EXTERNAL ENVELOPE Indeed, the thermal break is assessed as Fig 1a


a ‘Certified Passivhaus Component’, provides BBA Certification, LABC Registration and NHBC approval and meets full compliance with UK Building Regulations. The temperature factor used to indicate condensation risk for occupants in residential or commercial buildings – the (fRsi) value that must be equal to, or greater than 0.75 or 0.50 respectively – is comfortably met by incor- porating the solution. In addition, the solution is compliant with the Government Standard Assessment Procedure, SAP 2012 concerning carbon emissions from buildings and respectively heat losses through non-repeating thermal bridges.


Fig 1b


UNWRAPPED Fig 1a: Heat loss through a parapet connection wrapped along its entire length Fig 1b: Parapet with structural thermal break Images © Schöck


Parapets incorporating thermal breaks are also designed for low maintenance, as opposed to wrapped components that are prone to damage and, inevitably, repair and maintenance outlay. This is particu- larly the case in areas where railings or covers pierce the insulating layer. With thermally-separated parapets however, railings and covers can be attached directly into concrete.


Another significant benefit is that extra


useable terrace area is released because there is no thermal insulation applied on the internal surface. Thermally-separated parapets are also durable and water impermeable, minimising maintenance costs and the potential for expensive restorations due to waterproofing problems.


Cost savings


Recently, an independent cost analysis undertaken by Andrews Eades Chartered Surveyors involving two 12.5 metre-long parapet constructions: a conventional parapet construction detail and a second detail incorporating the structural thermal break with a spacing of 1.25 metres. Comparisons of construction costs show initial cost savings through the use of thermally-separated parapets of up to 10 per cent depending on the structure. The reason for this is simplification of the formwork process, as well as the detailing of the rear of the parapet.


Chris Willett is managing director of Schöck


ARCHITECTURAL GLASS


Shopfronts Balustrades


Automatic doors Splashbacks


Complete design & build service


Please contact us for details 01903 733206


www.demon-designs.co.uk info@demon-designs.co.uk


WWW.ARCHITECTSDATAFILE.CO.UK


ADF JULY 2017


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