H+H celebrates 2000th Rå Build
H+H Celconcontact supplier
The Rå Build method of aircrete construction
The Rå Build method of aircrete construction from H H has recently been specified for at a Linden Homes development in Northfields, Colchester.
The specification marks the the 2000th time the method has been used.
Originally, a timber frame build method was chosen for the development, but an aircrete construction method was adopted instead due to its cost-saving benefits.
The 265 houses and 100 apartments in the second and third phases of the developments are being constructed using H H blockwork and Celfix thin joint mortar.
The external walls are solid aircrete using 3.6 and 7.3N/mm² 200mm thick Plus Blocks.
The blocks are insulated with 150mm EPS insulation and finished with a Weber Therm XT render system giving U-values down to 0.19 W/m²K.
Separating walls use two leaves of 100mm Jumbo Bloks, complying with Robust Detail E-WM-10.
The Rå Build method uses the Thin Joint system with large format blocks to build the inner aircrete leaf directly to full storey heights ahead of the external brickwork or cladding.
This provides a fast, stable and weatherproof shell, allowing first fix trades early access while the external cladding is completed.
Further time is saved by the use of retrofitted joist hangers, avoiding any block cutting at floor level, and enhancing air permeability levels.
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