First CDL Handbook now available!

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The BBA and RDL have joined forces to form a joint venture called Constructive Details Limited. Under this initiative the two companies aim to work together with the industry to provide solutions on the increasingly complicated, technical and often confusing issue of linear thermal bridging.

Linear thermal bridging (described by a psi-value) can now account for up to 30 % of heat loss in a building and with the need to provide more energy efficient buildings on the road to zero carbon, the industry is looking for ways to obtain reliable, favourable and realistic psi-values.

One of the aims by CDL is to facilitate accurate psi-value calculations and we are now pleased to announce the launch of the first Constructive Details handbook of masonry detail junctions developed for the Aircrete Products Association. The Handbook is available electronically via a dedicated “Resources” page on the CDL website and can be downloaded free of charge.

The junctions are for partial fill external wall (16 details) and full fill party wall (5 details). Another handbook of the same junctions but for a fully filled external wall cavity is already under assessment.

The main benefits of using Constructive Details are:

• The details have been optimised to provide significantly lower psi-values than those in the ACD’s, leading to a 60 % improvement of the overall y value
• The handbooks contain a complete set of junctions needed to construct a dwelling allowing optimum thermal bridging performance to be achieved. They match the ones currently featured in Appendix K of SAP 2009 with clear and simple drawings, easy to follow examples for achieving the desired psi-values, checklists for use on site and guidance on the amount of insulation needed
• They are future proofed – providing the E and P numbers for each junction and providing a range of U values for the plain elements to meet current and future performance all the way up to Passivhaus standards
• They use generic products allowing supply chain flexibility and consequent best costs

As Greg Cooper, Chief Executive of the BBA says “The BBA is delighted to have worked in partnership with RDL to produce this handbook. It will undoubtedly enable aircrete block manufacturers to pass on accurate information to their customers and provide house builders with a complete list of thermal details to use in their design and build process”. Dave Baker, Chief Executive of RDL adds “The CDL handbook follows the principles of the Robust Details Part E scheme handbook and should prove to be an invaluable tool for designers and new home builders alike.”

So go ahead and register to be the first to view the CDL Handbook and use our Twitter account @ConstructiveDtl to give us feedback!

For more information on this press release please contact enquiries@constructivedetails.co.uk

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