Suppers, the voice of wisdom as always. You still around then?

Still a regular visitor.

Brian, I know your school was good because it was approved, but did they really teach you latin? Your speliing is as perfect as all your previous work for your previous employer if I may be so bold as to say so.

It's very difficult as there is no standard identification method - whilst several manufacturer's use pink dye, some use green or blue and I've found some that are yellow just like non FR foams.

Whilst not infallible from the different manufacturer evidence I've seen over the years if it's aerosol can type expanding foam then generally if it's being used for anything other than very small linear gaps (not penetrations to said gaps) and narrow gaps to door frames (often capped to 10mm with mastic) then there's a very good chance it is an incorrect use that will fail spectacularly early (as graphically illustrated in the ASFP video).

Gun applied cartridge single & 2 pack non aerosol 'foams' such as specialist products from Hilti, Mulcol and others generally have a much wider scope of use including service penetrations and much larger holes and visually look quite different.

My question had its roots in an ambiguous requirement for protected escape routes in BS7671A2 2022. However, a corrigendum was released by IET just this month to clarify the situation. All now reasonably clear.

The principle is simple enough

Resi care - operator acts loco parentis (I may have spelt this wrong) - eg the care home operator is directly responsible for the residents like parents are for their kids.
A such the staff should have a plan to evacuate the residents as appropriate - fire service rescue is the back up when that doesn't work

Specialised housing - people live under their own steam (kind of) and nobody is responsible for looking after them 24/7.
If they cant evacuate themselves, then they need to be rescued.

It gets a bit muddy around the edges cos people play silly beggars