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We're installing internal wall insulation (old house, solid brick walls) and from what I read a major problem can be thermal bridging, where you have a less insulated gap that gets cold, produces condensation and then you have a horrible mould problem, all the joists rot and the house falls down.
I'd like to avoid this, ideally...
The installer is a local plasterer, comes recommended but I doubt is an expert on insulation.
It'll be insulation backed plasterboard, stuck on all the external walls (after removing the old render/plaster back to brick).
My main concern is in the gaps between floors. How is this best avoided? Do I just take up the floorboards around the edge of the 1st/2nd floors and insulate the bit of wall there? With what? Glass wool stuff? Expanding foam?
Anyone have experience with this, or just good ideas?
You need to get the property assessed by someone that knows what they are doing. Don’t put foam backed plasterboard in a solid walled house with lime mortar. Breathable materials only in an old house and you will need to have a robust ventilation strategy at the same time.
But back to the original question, yes you will have a thermal bridge. You will need to insulate the inter floor area. You may well need a wufi calculation to work out if your joist ends are likely to rot. Don’t leave it to a plasterer to tell you what to do