The simplest way to look at the amendments to Approved Document B is that any fire-resisting element should be proven using EN standards, following the process of ‘test’, then ‘extend’, and then ‘classify’.

TEST - Testing must use the appropriate EN fire-testing standard.

EXTEND - Extension of test data to similar applications can be done, but only by qualified and approved third-party bodies using the test standard or extended application (EXAP) – and, critically, only where the standards explicitly allow it.

CLASSIFY -  Finally, this evidence must be validated and summarised in an official third-party classification report.