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Posted By: MarkyPmy extension is having EPS EWI over new medium density blockwork cavity walls with full fill mineral wool insulation. I think the combination of the adhesive on the EPS and then the render on the EWI will make it air tight externally.
Posted By: djhI would have thought that you'd want the airtightness barrier on the inside of the wall. That's what you need for integrity of the thermal performance of the house.
Posted By: gravelldSurely it's more complicated? And therefor more liable to error? It means going around every joist etc
Disruption - if EWI is sold as low disruption, and we want to perform proper holistic retrofit, how are we going to do air tightness? Plus I don't fancy ripping out every internal wall covering in my own house.I would've thought, conceptually, an external (although internal to insulation) air tightness layer is easier
Posted By: djhIcynene is specifically marketed for cavity fill insulation
Posted By: DarylPno, the air could set up convection currents, effectively wicking heat away from the inner/warmer leaf and to the colder outer leaf. Better to prevent air movement where ever possible.
Posted By: gravelldWhat about membranes, can they have a place, fixed on the existing external leaf before EPS applied?
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