TIMSA Scheme

U-Value and Condensation Risk Competency Scheme assisting with objective
and consistent calculation of U-Values and condensation risk within buildings.

The BBA/TIMSA scheme was developed to help promote and assist with accurate, objective and consistent calculation of U-Values and condensation risk within buildings, highlighting the competency of the installers (and the organisations) of these types of products.

Open to TIMSA (the Thermal Insulation Manufacturers and Suppliers Association) and non-TIMSA members.

The scheme has the backing of two of the most popular U-value software providers, JPA and BuildDesk. It is also included in the RdSAP conventions document (the version of SAP dedicated to existing dwellings as a recognised calculation competency scheme).

The content was devised in association with TIMSA who continue to participate in maintaining its validity with continual development. The scheme is open to anyone seeking reassurance that the calculations being provided are supplied by an individual or company that has been subject to a rigorous and ongoing independent assessment process.

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How to become a Competent Person (Organisation) under the scheme

The assessment process for the BBA/TIMSA U-Values and Condensation Risk Competency Scheme consists of four simple steps:

  • An initial screening – Based on sample calculations designed to explore the understanding of BR 443 and BS EN ISO 6946

  • An office inspection – To examine the company’s quality system and examples of actual calculations

  • Certification that defines the individual areas of competency

  • Ongoing surveillance to maintain certification (annually)

Each Competent Person is given a unique number and this is used as an identifier of calculations covered by the scheme. A certificate is provided at the successful completion of this process, and these certificates are also published on the BBA website as a demonstration of competency.

Note: The scheme does not include a course or training; it is an assessment of competence in relation to U-values via the combined method (not numerical modelling). Therefore, we advise that assessment under the scheme should be undertaken once you consider yourself ready, as we don’t have any pre-requisites.

Apply here for BBA/TIMSA U-Value and Condensation Risk Competency Scheme >> 



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