hi

i have an old house..80 odd years.. the plaster is pretty caput and
theres no cavity wall. what i want to do is insulate the outer walls as
im renovating it. i figured that if i could get some insulation, then
put plasterboard over it then id have new walls and an insulated house.

is this idea possible?

what insulation should i use?

how would i fix the plasterboard over the insulation? battens?

the old plaster is sound, but tired.and uneven.

thanks.

mushymanrob wrote:
hi

i have an old house..80 odd years.. the plaster is pretty caput and
theres no cavity wall. what i want to do is insulate the outer walls
as im renovating it. i figured that if i could get some insulation,
then put plasterboard over it then id have new walls and an insulated
house.

is this idea possible?

Yes.

what insulation should i use?

You can buy insulated p-board, they have polystyrene on the back of them.

how would i fix the plasterboard over the insulation? battens?

If you are going to batten each wall, then you can use fibreglass, which
would be cheaper.
Set your battens at 300mm centres upright, and 1800mm horizontally, then
when you screw the p-boards on (900 X 1800's) they will meet the battens
half way across.

Bear in mind that you will lose the skirting boards on these walls and also
any elecrical cables and fittings will need to be removed and/or replaced.

"mushymanrob" wrote in message
ups.com...
hi

i have an old house..80 odd years.. the plaster is pretty caput and
theres no cavity wall. what i want to do is insulate the outer walls as
im renovating it. i figured that if i could get some insulation, then
put plasterboard over it then id have new walls and an insulated house.

is this idea possible?

what insulation should i use?

Bang for buck new:

http://www.british-gypsum.bpb.com/pr..._reckoner.aspx

http://www.british-gypsum.bpb.com/PD...tor%20card.pdf

http://www.british-gypsum.bpb.com/pr...ould_know.aspx

surplus, knocked about the building site a bit can be had from your local
auction house - especially king span which you will need to board over.


how would i fix the plasterboard over the insulation? battens?

all in one.

--
Mike W

"mushymanrob" wrote in message
ups.com...
hi

i have an old house..80 odd years.. the plaster is pretty caput and
theres no cavity wall. what i want to do is insulate the outer walls as
im renovating it. i figured that if i could get some insulation, then
put plasterboard over it then id have new walls and an insulated house.

is this idea possible?

what insulation should i use?

how would i fix the plasterboard over the insulation? battens?

I am planing to do this myself. I think as others have mentioned you need
to consider window reveals skirting architraves etc So if you have lots of
original features this could be costly to reinstate. Another consideration
is condensation on the brick work wall behind the insulation. You have to
avoid this at all costs. My architect has said that he will ask e.g.
celotex to do some calculations so that the thickness of insulation ensures
the dew point is still within the masonery wall. If it condenses on the
surface you will have big problems in the future that will far outweigh the
energy savings.

2p
Jon

i have an old house..80 odd years.. the plaster is pretty caput and
theres no cavity wall. what i want to do is insulate the outer walls as
im renovating it. i figured that if i could get some insulation, then
put plasterboard over it then id have new walls and an insulated house.

what insulation should i use?

I would use Kingspan K17. The plasterboard is already bonded to the
insulation, so you don't need to worry about that!

The insulation can be dotted and dabbed to the existing wall surface, if it
is suitable. If not, use K18.

http://www.insulation.kingspan.com/newdiv/k17.htm
http://www.insulation.kingspan.com/newdiv/k18.htm

Christian.

JupiterJon wrote:
"mushymanrob" wrote in message
ups.com...
hi

i have an old house..80 odd years.. the plaster is pretty caput and
theres no cavity wall. what i want to do is insulate the outer walls as
im renovating it. i figured that if i could get some insulation, then
put plasterboard over it then id have new walls and an insulated house.

is this idea possible?

what insulation should i use?

how would i fix the plasterboard over the insulation? battens?

I am planing to do this myself. I think as others have mentioned you need
to consider window reveals skirting architraves etc So if you have lots of
original features this could be costly to reinstate. Another consideration
is condensation on the brick work wall behind the insulation. You have to
avoid this at all costs. My architect has said that he will ask e.g.
celotex to do some calculations so that the thickness of insulation ensures
the dew point is still within the masonery wall. If it condenses on the
surface you will have big problems in the future that will far outweigh the
energy savings.

Can anyone explain how these calculations are done ?
What about if you have a soild wall / celotex / wallboard sandwich with
no air gaps ?
Also, if you have a vapour barrier (e.g. using taped celotex/kingspan),
do you have to worry about this ?
Simon.