H+H UK Ltd Aircrete - Airtight cost advantage for housing
The Thin Joint bonding system provides its airtightness advantage when used for insulation in structural aircrete construction. This claim was proven by consultants calfordseaden to cost over 8% less than using either timber frame or SIPS for housing.
The cell structure alone of H+H aircrete provides the initial airtightness for the Rå Build method. Made up of millions of tiny non-interconnecting cells to reduce heat loss and bonded by Thin Joint instead of general-purpose mortar, the Rå Build method reduces the air permeability of the structural wall by nearly 10%, to 0.12m3/hr/m2 at 50 pascals, when reviewing the blocks as an individual component.
The corresponding value is 1.04m3/hr/m2 for H+H aircrete when used with general-purpose mortar. Thin layer mortar offers similar values to that of the material itself. Where care and attention to detail is taken, H+H’s products therefore offer highly airtight solutions.
Without the ability to seal and insulate British housebuilding, it is well known that Code levels cannot be achieved. Thin Joint provides the solution, with tempting cost advantages.
Comparing four different design options for a 20-unit development of typical three-bedroom semi-detached houses, calfordseaden proved the Rå Build method using Thin Joint costs £59/m2 less over the flooring area, than timber frame or SIPS to achieve the same 0.25W/m2K U-value in the external walls.
The following articles may also be of interest:
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ENDS
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Jenny Smith-Andrews, H+H UK Ltd
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email jenny.smith-andrews@hhcelcon.co.uk