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.
A new student accommodation block at the University of Reading is being constructed using H H’s Thin-Joint system which comprises Celfix mortar and MultiPlate aircrete blocks. A masonry cavity wall set between the frame’s concrete columns forms the building’s façade. The cavity wall’s inner leaf was built using 610 x 375 x 100mm H H MultiPlate aircrete blocks.
H+H Celcon Blocks Standard Grade together with Celcon Foundation Blocks have been used to create a custom built, four bedroomed house in Bourne End, Buckinghamshire. Specified for their inherent thermal qualities, the Celcon Blocks, used in conjunction with 100mm external wall insulation above DPC and 80mm below, have helped the construction achieve a minimum U-value of 0.24W/m2.
Code of Practice change means more use of Thin-Joint solutions for faster floor construction download
Amendments to the Code of Practice by the Precast Flooring Federation means H+ H Celcon Thin-Joint System will benefit even more contruction projects. Read more details on the changes and how Thin-Joint system uses large format, accurately dimensioned, aircrete blocks and quick drying Celfix Mortar for a faster and better quality build solution than traditional brick/block cavity construction.
H+H has launched downloadable BIM objects for each of its products via the National BIM Library and its own website. Seventeen BIM objects are now available covering Celcon and Celcon Plus blocks of varying grades and Foundation, Jumbo Blok and Multi-Plate blocks. H+H is one of the first manufacturers to offer a full BIM suite, three years ahead of the mandatory use of collaborative Level 2 BIM.
The Rå Build all in one building method from H H has enabled the construction of two semi-detached bungalows in less than five days. The bungalows were constructed by Wellington Construction on a restricted site in Kessingland, Suffolk for Orwell Housing Association. The Rå Build method comprises aircrete block work and quick setting Thin-Joint mortar to create ground floors, exterior walls, upper floors and partitions.