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TIWI + Cavity Wall insulation + Thermal rendering vs eternal insulation
We're looking at buying a house that has significant wear to the external rendering leading to damp inside. It is also currently poorly insulated. Given the external rendering needs to go I was considering replacing with either:
Cork Thermal Rendering outside + cavity wall insulation in the (likely 40mm cavity) given it is a 1930s bungalow + cork TIWI inside
or
60mm k5 external wall insulation and render over the top then just replaster inside to remove damp plaster.
Do these options seem like sensible ones to insulate the house (given we want to eventually move to heat pump and underfloor heating).
Thanks
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