April 21, 20233 yr Hello We have a small cottage in Ireland with exterior walls of old stone and 100mm EWI. This is the plan: 100mm EWI (exists) 400mm old stone wall (exists) Breathable airtight membrane against wall 20mm air gap Thermally bridged metal stud frame (with insulation) Plasterboard Does that look like a good plan? Do we need a vapour barrier? The old stone wall is sometimes exposed repointed stone, othertimes several renders. It is extremely uneven. How do we secure the stud tracks to a wall that is all over the place? Any ideas for this appreciated. I imagine an adjustable bracket hopefully providing a thermal bridge but cannot find anything. Many thanks, Phil
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