On 30/01/2021 11:56, Roger Hayter wrote:
roofs don't attract a requirement for fire resistance.....unless an
escape route is over them....
There may be no requirement, but I'd generally prefer mine not to be on fire
given a choice.
I think that is a reasonable attitude. Do what you can to limit speed
and spread of fire as well as ensuring escape

depending on what is above the ceiling a box of plasterboard stuffed
with rockwool would give a nice bass as well as fire resistance. glue it
together with plaster or car body filler

But you will need access from above to make a good job...


--
"It is an established fact to 97% confidence limits that left wing
conspirators see right wing conspiracies everywhere"