Wall insulation internally, help! So Confused!

[adam858]

Hi All!

Old house built approx 1900 with solid external walls, currently some have plasterboard fitted to a thin 1” batten straight on the wall and some of it is dotted and dabbed to the wall.

I am thinking of building a 2x2 frame on top of the existing plasterboard, filling the gaps with 50mm celotex then a new plasterboard over the top.

Is this the best way to do it or should I remove the existing plasterboard first? Will the old plasterboard aid the insulation if I leave it there plus keep an air gap for the brick wall to breathe?

TIA, Adam

 

[jeds]

Strip it off and fix thermal plasterboard direct to brick. Quick, clean, effective and takes minimal space. If your walls are dry fixing dot and dab. If walls are damp fix mechanical. E.g. Kingspan k17 or k18 board.

 

[adam858]

Many thanks for quick reply jeds Ideally I would do this if it was the cheapest way (I'm a skinflint) . Space is not an issue I have too much space, cost is the main issue and the thermal plasterboard seems to be a lot more expensive than the normal insulated boards. Unless I am looking in the wrong places?

Is there any other disadvantage other than loosing space to leaving the existing plasteboards in place?

 

[jeds]

The risk of leaving existing board in place is condensation forming in the unventilated cold void which you will be creating. I can't see fixing a timber frame and then insulation between and then plasterboard on top being any cheaper than fixing just one product.