BBA’s Jon Denyer Re-appointed Chair of Key BSI thermal Performance Committee

BRITISH BOARD of Agrément Principal Scientist Jon Denyer has been re-appointed Chairman of B/540, a key BSI committee dealing with the energy performance of materials components and buildings.

Jon’s three year tenure as chair will see him continue to help establish committee agreement on standardisation issues. He will represent the UK’s stance on European and international standards and maintain close relationships with the European Committee for Standardisation (CEN) and International Organisation for Standardisation (ISO) are maintained.

Jon said: “B/540 is the key committee for the UK’s national and international input into standardisation of thermal performance in the construction industry and a significant responsibility. I look forward to continuing my work in this role and enjoying the ongoing support of committee colleagues who contribute their time and expertise to the vital role of standardisation in this field.”


His appointment was announced by Scott Steedman, BSI Director of Standards, who said committee chairs undertake an important function on behalf of the UK National Standards Body.

Jon also chairs a sub-committee of B/540 which is updating BS 5250, the code of practice for control of condensation in buildings. The code’s scope will increase to include moisture risk from sources other than condensation and a more holistic approach to properties (particularly those undergoing energy efficiency measures).

Jon’s career at the BBA spans more than 34 years and includes helping develop the organisation’s guarded hot boxes and plates for measuring thermal performance of insulation products and systems. He has also led a team focused on building physics support with emphasis on thermal and hygrothermal performance. He has also been active in standardisation activities with BSI, UEAtc and EOTA and worked with national standardisation committees and European working groups focused on the thermal performance sector.



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