Wall material between dormer room and attic spaces

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

I dont think so but you WILL need smoke alatrms.

worst case use masterboard behind the wood planks, if you need a fire barrier.

Seems reasonable - thank you.

The only thing that I wondered about is mounting sockets in this panelling (in the non removable parts). But having checked, I cannot find anything prohibiting that.

I was wondering to upgrade to fire resistant ply, but it's not that easy to get - we'll be needing a fairly good quality ply to route grooves in.

Indeed - the BCO was involved there and we've done everything required (tyvek under the tiles, 25mm air gap, 3" celotex between rafters and added new proper vents bother ends of the flat roof so the deck is ventilated (50mm gap between deck and celotex as BCO specified).

The remaining 25mm/50mm layer of celotex will bring everything to around

That is not a bad idea at all... Could bond a thinner ply to the surface to route grooves into.

In message , Tim Watts writes

There's this stuff

You can purchase paint on intumescent products but I don't know if they do a clear lacquer or how child/pet friendly it might be.

Our builders *fireproofed* a supporting steel with 18mm pine board Hilti gunned on. (20 years ago)

I've seen grooved ply used as a wall decoration so you can probably buy it ready to nail up.

IIRC you can buy ply cladding(thin) with the grooves already cut.

You can always fit intumescent back boxes if it bothers you or indeed fit a intumescent gasket to a normal box

They are not that expensive and also act as acoustic barriers if needed.

I have been considering that - not cheap. But Euroclass B seems to be equivalent to painted plasterboard for ability to hold back a fire.

I've also come across a link to one of those too - amazing stuff. Used in Stately Homes:

:)

I've seen MDF, not ply - wonder who sells it?