You sent a flexible wall detail, but I have a rigid wall? Tested Detail Queries

As per the BS EN 1366-3:2021 fire-resistance test standard for service penetrations, Section 13.3.2.4 states:

Section 13.3.2.4

Test results obtained with double-sided standard flexible wall construction may be applied to rigid constructions of an overall thickness equal to or greater than that of the element used in the tests and a minimum density of 350kg/m³. For rules regarding increased thickness see Annex E, if relevant. In the case of hollow brick walls, the same rules regarding aperture framing apply to double-sided flexible walls.

Learn more about BS EN 1366-3:2021’s rules for the interchangeability of supporting constructions.

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