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structural elements
the insulation and waterproofing membrane beneath. Unlike dark-coloured roof finishes the surface materials also contribute to reducing the urban heat island affect, making a positive con- tribution to a city’s, and the world’s, climate. The limitation in application tends to be the structural load of the system; a loading of 80 kg/m2
nificant programme benefits, for example systems certified for zero falls installation can remove the time and cost of adding screed to falls.
Standards and technical requirements
BS6229:2003 is the Building Regulation covering falls on flat roofs, and specifies minimum finished falls of 1 in 80, achieved by designing to 1 in 40. But 2003 was a while ago, and 2016 BS6229 will be updated to include zero falls applications as defined by ETAG 031, ETAG 005 and British Board of Agrément in Building Bulletin 4. ETAG 031 is a European Guideline published in 2010 that
sets the requirements for the certification of zero falls design and calculation; BBA Building Bulletin 4 is a précis of the requirements. Both these documents are recognised by the NHBC and zero falls construction is accepted in its Chapter 7.1 standards publication, updated in November 2015. Reference to zero falls application also appears in the LRWA Hot Melt Code of Practice and the GRO Green Roof Code. When checking the suitability of a roof for zero falls application it is important to ensure the manufacturer assesses
enq.171
www.architectsdatafile.co.uk
the deflection plan for the deck to identify any low points that are not near rainwater outlets. If the outlets cannot be moved to areas of high deflection then other options should be explored with the manufacturer to ensure effective dispersal. Once the zero falls design of the concrete slab has been
is typically required to
retain the insulation on the roof. However, with most inner city developments being concrete frame this is less of a concern. From a construction perspective inverted roofs can offer sig-
signed off, the next consideration is compliance with Parts L and M. Insulation has traditionally been thicker with inverted roofs than with warm roofs but as U-value requirements tighten higher performance has been achieved with less thickness.
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