LABC Registered Construction Details
Following a comprehensive review, LABC has decided to no longer support LABC Registered Construction Details.
LABC Registered Construction Details were developed using Standard Assessment Procedure (SAP) 2012, BRE Conventions for U-value calculations BR 443 (2006 edition) and BRE Conventions for calculating linear thermal transmittance and temperature factors BR 497 (2007 and 2010 amendments and conventions). In view of this, LABC Registered Construction Details are only valid for use with building work intended to follow the below guidance:
England
- Approved Document L1A (2013 edition incorporating amendments up to and including 2016)
- Approved Document L1B (2010 edition incorporating amendments up to and including 2018)
Wales
- Approved Document L1A and L1B (2014 edition incorporating amendments up to and including 2016)
As a consequence, LABC Registered Construction Details should not be used to demonstrate compliance with the following guidance:
- Approved Document L Volume 1 (2021 edition) or any subsequent amendments in England,
- Approved Document L Volume 1 (2022 edition) or any subsequent amendments in Wales
This is because the above versions of Approved Document L Volume 1 require the use of Standard Assessment Procedure (SAP) 10, BRE Conventions for U-value calculations BR 443 (2019 edition) and BRE Conventions for calculating linear thermal transmittance and temperature factors BR 497 (2016 edition).
As outlined in Approved Document L Volume 1, an alternative to using LABC Registered Construction Details may be to adopt one of the following methods to assess thermal bridging in a new dwelling:
- Use construction joint details calculated by a suitably competent person following the guidance in BRE Conventions for calculating linear thermal transmittance and temperature factors BR 497 (2016 edition) and the temperature factors set out in the BRE Information Paper 1/06.
- Use junction details from a reputable non-government database containing independently assessed thermal junction details.
- Use the values in the Standard Assessment Procedure, Table K1. A mixture of known and default values may be used.
- Use a default y-value of 0.20W/(m2K).
If you have any further questions, please contact us at consult@labc.co.uk
