On 04/09/14 22:06, The Natural Philosopher wrote:
On 04/09/14 20:54, wrote:
On Wednesday, September 3, 2014 11:25:53 PM UTC+1, Tim Watts wrote:
Each of these 4 locations will be a "cupboard" on the dormer uprights in
some semi dead space (where the ceiling is low) but usefully accessible.

You could use meter cupboards. Fireproof metal box, f/r backing board
for fixing things to, and a neat(ish) door and frame with a cam-lock.

Build with masterboard/multiboard instead of plasterboard, though even
plasterboard has reasonable fire resistance

Thank you - I like the look of that:

http://www.travisperkins.co.uk/p/pro...559000/3893471

It skims and paints fine.

My experience of house fires is that hot gas and flame do the most
damage, not just a high temperature.

Indeed. One time in a million some PSU or JB will fry badly.

As I've taken the decision to keep my lighting JBs bundled in groups for
accessibility, one in each corner of the roof, it would make sense to
mount them on a bit of 18mm ply fixed to the dormer uprights.

From there it was a tiny step to make them part of a wall (the upper
parts of the wall will have celotex, so we have some "spare" depth going
anyway).

From there it was a tiny step to say "how can we take the 1:1000000
risk of a PSU gettind red hot and stop it being a risk to the timber
that surrounds it.

That's the trouble with "brownfield" development.

Greenfield - you just say "meh - this is the perfect layout, make it so".

Already developed - well your stuffed and make do.

Brownfield - contrains everywhere but just enough freedom to say "how
can we do this really nicely to be easy to maintain"...

Serious fireproof is double metal or ceramic (brick?) with insulation
between. a bit OTT?