Hi all
Is it ok to to fix kingspan insulation boards directly on to the wall
without having to use battons, and as these boards have a foil backing
on them can i just fix plasterboard straight on to them without having
to use a vapor barrier.

In article ,
(eddie) writes:
Hi all
Is it ok to to fix kingspan insulation boards directly on to the wall
without having to use battons, and as these boards have a foil backing
on them can i just fix plasterboard straight on to them without having
to use a vapor barrier.

Having opened out a fireplace for decorative effect (no fire
in it), I put Kingspan along the back, which was only single
brick thick, to stop it getting cold and likely forming
condensation there. Working out how to fix it in place is an
interesting challenge. ISTR I used a very thin masonary bit
to drill right through the kingspan and into the wall. Then
lift the kingspan out again and drill and plug the holes with
regular sized bit. Put the kingspan back in place and screw
to the wall. Then for the plasterboard, long drywall screws
to initially mark the position of the holes on the kingspan
surface, and then drill and plug the wall behind, and fix in
place using the long drywall screws.

This was fine for something the size of the back of a fireplace,
but I'm not sure what kind of result you'd get doing a whole
wall this way. I believe you can have kingspan (or equivalent)
sheets made with plasterboard on one side, or a paper side
for plastering, or something like that, but it's a special
order. If you use separate kingspan/plasterboard sheets, you
probably want to make sure the edges are staggered, i.e. you
don't have a kingspan join immediately behind a plasterboard
join.

--
Andrew Gabriel

Is it ok to to fix kingspan insulation boards directly on to the wall
without having to use battons, and as these boards have a foil backing
on them can i just fix plasterboard straight on to them without having
to use a vapor barrier.

The problems you will find are purely practical in that you need to find a
way to affix both the insulation and the plasterboard. The foil will indeed
act as a vapour barrier. It is best to tape the joins also, so the vapour
barrier is continuous.

Christian.

"eddie" wrote in message
om...
Hi all
Is it ok to to fix kingspan insulation boards directly on to the wall
without having to use battons, and as these boards have a foil backing
on them can i just fix plasterboard straight on to them without having
to use a vapor barrier.

You can do, but the wall may then retain moisture that used to evaporate. I
would use battens and a 1" cavity, or thick lumps of plaster adhesive,
removing the foil and digging a small crater for the dabs to get adhesion.

On 20 Oct 2004 02:30:33 -0700, (eddie) wrote:

Hi all
Is it ok to to fix kingspan insulation boards directly on to the wall
without having to use battons, and as these boards have a foil backing
on them can i just fix plasterboard straight on to them without having
to use a vapor barrier.


I wanted to insulate my garage in this way, and it is certainly worth
doing - it makes it quite habitable as a workshop and cheap to heat.

I have a single brick wall garage with a pitched roof of trussed
wooden structure, so the task was to insulate roof and walls.

For the roof, I fastened the Celotex to the rafters with long drywall
screws and large washers and taped the joints. This left an air
space behind for ventilation.

For the walls, I did consider your idea, but rejected it for two
reasons.

- I did not feel comfortable with the idea of not having some degree
of ventilation on the inner face of the wall to allow drying out of
any possible penetrating moisture.

- I wanted to be able to fix shelves, brackets cupboards etc.
arbitrarily to the walls.

To achieve this, I built framing using 75x50 pressure treated timber
Rawlbolted to the floor with a DPC strip to separate it and fitted to
the joists at ceiling level.

The back of the framing left about a 20mm gap to the bricks so there
is little loss of space. The Celotex was cut to fit inside the frames
and taped.

Finally 18mm WBP ply was screwed to the frames and painted white.

This gives me a surface onto which I can fix ordinary cupboards and
shelves anywhere I like using either screws directly or cavity fixings
for heavier weights. For very heavy weights like a cyclone dust
extractor weighing about 100kg, I attached battens to the framing
using coach screws and attached the extractor to them.

This is not to say the plasterboard and insulation attached as you
have described won't work, but I would be concerned about moisture and
you won't have a substantial surface for attachments if that is
important for you


..andy

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On 20 Oct 2004 10:12:16 GMT, Andrew Gabriel wrote:

I believe you can have kingspan (or equivalent) sheets made with
plasterboard on one side, or a paper side for plastering, or
something like that, but it's a special order.

No it's a stock item at a decent builders merchant. Just used two
sheets of 9.5mm PB bonded to 25mm celotex type foam. This came from
British Gypsum I think, look for "thermalboard" or similar via google.

--
Cheers
Dave. pam is missing e-mail

The garage will be a fish house, what if i put 2x1 batton on the wall
then fixed the sheets directly on to the batton so creating a 25mm gap
between the wall and boards tape this then use a hammer fixing (nylon
plug with drive screw) to go through the plasterboard and insulation
through to the wall then plaster over the board.

On 20 Oct 2004 12:02:43 -0700, (eddie) wrote:

The garage will be a fish house, what if i put 2x1 batton on the wall
then fixed the sheets directly on to the batton so creating a 25mm gap
between the wall and boards tape this then use a hammer fixing (nylon
plug with drive screw) to go through the plasterboard and insulation
through to the wall then plaster over the board.



You could do that, but definitely make sure you tape the joints with
foil tape. You want to keep any humidity inside and not allow it to
reach anything cold.

If you make stands for the aquaria, they will need to be floor
supported. No chance of using the walls.


..andy

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