Another Solid Wall Insulation Question

[ScottishGasMan]

Hey All.

Will be starting work on the bedroom on my house rennovation shortly.

2 outside solid sandstone walls with old lath+plaster internal coverings at the moment.

I have 50mm Celotex insulation boards which I plan to frame the two walls and fit between them.

I know if I was going direct onto the brick, I would use 60/70mm deep battons to give a 10/20mm air gap between the back of the celotex and the stone wall.

But could I just leave the lath/plaster in place and fit celotex direct to that which would still give the origional gap behind the lath/plaster and just use 50/60mm deep battons to either have the celotex flat against plaster or 10mm gap behind?

 

[Alastairreid]

Why dont you dot n dab the boards directly to the plaster with nailable plugs.

 

[ScottishGasMan]

You mean dot and dab the celotex over the full wall with no battons. Then plasterboard over that with nailable plugs?

(dunno if I made sense before but the celotex is insualtion+foil only, not plasterboard backed insulation if it makes any difference)

If thats an option then definetly, would save a lot of time dealing with framing the walls and stop the wood making cold bridges, the 2 walls in question will not be used for shelfs or wall mounted tv ect so weights not an issue

 

[Alastairreid]

Sorry never read your post properly! i thought you meant insulated boards..