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.
Yes.
You can buy insulated p-board, they have polystyrene on the back of them.
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.
Bang for buck new:
all in one.
-- Mike W
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 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.
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.
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