Bre Accredited Details
The Certified Thermal Details and Products Scheme, run by world-leading building science centre BRE, gives thermal junction details an independent third party assessment, assuring users of the ‘as designed’ thermal performance.
Since the introduction of the revised Part L Building Regulations in 2013, which deal with energy efficiency requirements, designers are now actively encouraged to use details with specific thermal values attached and those calculated by a person or organisation with suitable expertise and experience such as Sika Limited.
Sika Limited have worked with the BRE in order to update its range of previously modelled New Build standard details, to ensure compliance with the latest industry standards & building regulations and also now the requirements of the BRE Certified Thermal Detail scheme.
“Since the launch of the Certified Thermal Details and Products Scheme at EcoBuild 2015 we’ve had an excellent response from industry, with both manufacturers and designers realising the value of accurate and independently assessed thermal performance values. The free to access searchable online database is constantly evolving, and the increasing number of high quality suppliers, such as Sika Sarnafil, undergoing certification demonstrates a positive step change in reducing the performance gap and enhancing building performance.”
- Graeme Hannah, Scheme Technical Manager from BRE
Sika Sarnafil’s standard thermal junction (roof & wall abutments only) details have now been thermally modelled, assessed and certified in accordance with “BR 497 – Conventions for calculating linear thermal transmittance and temperature factors”. They contain specific ψ (Psi) values, used to calculate heat loss through a thermal bridge and measured as linear thermal transmittance W/m.K, but also the temperature factor (f), which is used to assess the risk of surface condensation or mould growth.
Where project designs are carried out based upon non certified junction details, these have to use a range of increased default values as recommended within the Building Regulations & BRE information document IP 1/06. Ultimately this is likely to cause designers penalties elsewhere in order to make up for the anticipated heat loss through these potentially poorly designed or unproven junctions.