Tim Watts wrote:
Anyone know if in England, such a wall needs to be predominantly fire
resistant?

Stripping out the plasterboard now, to get more celotex on the underside
of the roof.

However, I'm interested in the idea of running 3' high 18mm plywood
around the entire room, routed with grooves to look like plank panelling.

Some sections would be removable and we'd make some secret doors for
access to the loft voids.

Before I go and bother the BCO, I'd like to check out some ideas so I
can go with a plan likely to meet approval.

It's one dormer room, about 2/3rds of the roof space, on top of a single
storey bungalow (so the dormer is the first floor) and only one room up
there, a sitting room.

So this ply would be the primary layer between room and attic.

Cheers for any thoughts...

Tim
The only loft fire resistance need that comes to mind is between lofts
of semi detached or terraced properties.

I can't think of a need in a detached property. I certainly did not have
to add any when I did my loft conversion in the 1980s $ dormers and 4
storage areas into the loft space.

I don't know if you have a warm or cold roof but pay attention to
insulation/ventilation needs