- The tables from the Energy Technology List (also known as Enhanced Capital Allowances) have now been incorporated into the standard as additional enhanced tables.
- A specific district heating table has been added based upon 55 °C flow temperatures with much more demanding heat loss requirements than existing tables.
- Single wall plastic pipework is now considered to have no insulative value of their own.
Updates to the Calculation Standard
A key point to note is that the standard does not currently take into account the changes to the BS EN ISO 12241: 2022 (Thermal insulation for building equipment and industrial installations. Calculation rules) calculation standard. BS5422: 2023 has been released in accordance with the 2008 edition of the calculation standard, rather than the newly released 2022 edition. This was done to minimise delays, but this does mean that the standard will need to be recalculated in the future to take these changes into account (Q3 2023 is referenced in the standard but as of Q2 2024 there has been no change of the standard). This standard change has significant impact on calculating thicknesses for condensation control, and will lead to some widespread thickness changes when incorporated.
It is worth noting that the standard also includes the below reference in section 8.3.3 – the implication being that unless instructed otherwise that the enhanced (Table B) should be used for each relevant standard.
