ok, can this be done…

we have a 1940’s extension on our house thats built from single 30cm thick block, it is mind-numbingly freezing even though the ceiling space is insulated to very high amounts.

i’ve got to do someting about it, especially as the upstairs room is my office and i can’t bear the thought of having to spend another winter in there, but we have very little spare cash.

my thinking is to add a layer of insulation to the inside wall then batten and plasterboard over, in the future i’d be looking to use high quality insulation but for now can anyone recommend a thin and cheap way of insulating?

You could use one of the Gyproc insulated plaster board lining systems.

90mm of their Thermaline Super would give you a U-Value of 0.22 when fixed to brickwork. When applied to blocks their values are based on the wall being rendered both sides.

The performance on blocks will depend on the density and thermal conductivity of your existing blocks. Give Gyproc a ring to confirm the required specification.

3 INCH by 2 inch cls screwe to wall at 16 inch centres , then fill voids with recycled plastic bottle insulation, good for ther environmnet and does itch, then cover with plasterboard .and paint, worked for me.

50mm metal studwork rockwoll and plasterboard is probably the quickest way of doing it. a hell of a lot quicker than timber stud walling or blockwork IME.

Kingspan or Celotex seconds – http://www.secondsandco.co.uk/

The Celotex/Kingspan route might be dearer but it’ll be the best insulation

as above kingspan will give you best insulation it is dearer or you can go for 100 mm or 70mm rock wool slabs between framing then use foil backed plasterboard the foil back will give you the vapour barrier that you will need .

Would the design of the extension lend itself to 100mm of external insulation behind say a featherboard cladding? Usually its the roof eaves that are the problem, but it would do wonders to get insulation on the outside of the thermal mass.

You’ll need a vapour check too, with the risk of interstitial condensation being high (condensation in the wall causing damp). Fit vapour check plasterboard.

Cheers
Scott

Gyproc Thermaline has a vapour control layer built in.

geoffj – Member
Kingspan or Celotex seconds – http://www.secondsandco.co.uk/

bloooooooooooooooooooddddddyyyyyyy hell, i’ve just bought a load boards for £45 quid each and this place turns up on the radar….:(