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The thermalite 100mm blocks claim to meet the building regs for water penetration. It has no windows or services but a small timber frame roof. Would the condensation be caused by the wall being too cold? With a thermalite block it'd still have a better u value than solid brick so I'd hope not?

Hi All, Desperately tried to google an answer to this but I have failed miserably. I am building a small side return kitchen extension. So small that every inch really matters. So I'm trying to keep the external wall as thin as possible. Due to the size of the extension I believe I fall...