Have you checked that the fire rated downlights you specified and installed have test reports showing that they are safe for use in the specified I-beam ceiling?

Engineered wood joists are built differently than solid wood joists, and because less material is used, they burn at a faster rate during a house fire.For this reason, fire rated downlights used in such ceilings must be tested to ensure that they meet the minimum 30-minute requirement.
The National Building Council (NHBC), the UK’s leading provider of warranties and insurance for new home construction in the UK, said last year that steps should be taken to ensure fire-resistant downlights comply with i-Joists homes used in new construction.
Appropriate evaluation or testing of specified I-beam-based floor structures and ceilings and specified recessed downlights is required to clarify approved installations.
Have you checked that the fire rated downlights you specified and installed have test reports showing that they are safe for use in the specified I-beam ceiling?Now is the time to check.
The complexity of the tests to which fire rated downlights are exposed must be understood in order to comply with regulations regarding minimum resistance periods.
A single test for a single duration does not imply that the product is suitable for all 30/60/90 minute duration applications.In order for the product to be fully compliant in all 30 / 60 / 90 minute installations, three separate tests of 30 minutes, 60 minutes and 90 minutes shall be carried out with luminaires installed in the corresponding ceiling/floor construction type and the relevant tests shall be carried out Evidence should be provided.