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personally, IMHO whilst you may not achieve a similar u value, you would probably get a much better performing wall with a pump in insulation such as rockwool energy saver.
hi i built my house using standard block outside leaf-100mm cavity with 60mm kingspan and 100mm quinn lite inner leaf,and the house is very warm(not only my view but every one who calls) and this is without curtains on the windows,.
First time poster!! so go easy!!. I have settled on a quinn lite 150mm inner leaf, 2no. 60mm xtraterm or kingspan boards, a 40mm air gap, (this gives a 160mm cavity in total) and a 100mm outer leaf dense block.
What kind of u-value would this give and would the wall ties need to be more than usual? what do you think of the wall make up?
A lot of people are telling me about the insulation board on the inside of the inner leaf but heard this can create mould, I think it sounds good in theory but has it just become the norm and be out lawed in 5 year when everybody is getting sick due to sick building syndrome
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