On 22 Aug, 15:09, "js.b1" wrote:
Seems to be a lot of hammer-in fasteners on the market.
They are attractive because of drill - insert - whack, rather than
messing about with wooden battens. That said a wooden batten at the
bottom seems a good idea to act as a shear-brace.
Good point about fire, Rawlplug do polypropylene (Screwfix) and
Fischer do nylon & metal, something metal is required for fire because
if the plaster falls off PIR foam is pretty nasty. That said I find it
an odd argument for domestic because you are dead if not out in a few
minutes anyway, long before plastic plasterboard fixings have failed.

think the idea is that *if* the fire gets behind the pboard and into
the PIR foam and so loosens the boards attachment to the wall by
adhesive dabs- those fixings will hold it up that bit longer whilst
you/a fireman get out /past

Re dot-n-dab, was that onto the foil and onto solid wall? Interesting
and quick "splodge" solution.

yup straight foam (latterly paper faced xtratherm) backed insulated
plasterboard onto solid walls, with frame fixers as mentioned. Quick,
easyish easier with 2 ppl, also accomodated some degree of "out of
vertical" /lumps and bumps with judicious use of extra pboard
adhesive.

I think I will go with the hammer-in fixings, 40mm celotex should
solve that icy box-room solid wall.

I reckon very much yes..
the effect here was excellent and so as I am working my way around
this ol' house I have done the same with various "newer" insualted
pboards - just got to work on the draughts a bit but the stoves need
an air supply....;)

Cheers
Jim K