On Monday, January 29, 2018 at 8:28:08 AM UTC, The Other Mike wrote:
On Sat, 27 Jan 2018 09:51:06 -0800 (PST), George Miles
wrote:

But I've removed the loft above the bathroom: now the tank's at the top of a very tall room and over it is an OSB3 ceiling, 8 inches of kingspan , osb3 and an EDPM rubber roof.

Does the use of OSB3 in that arrangement comply with building regs particularly
with respect to spread of fire?
--

I hope its OK with building regs,
I have read somewhere about some intumescent paint or varnish to coat interior OSB with but I couldnt find anything about it when I researched it last. I also have OSB3 on the bathroom walls.

If the bath catches fire its probably too late!

[g]