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Ah, I see. Cheers for your speedy responses. When you say cubic volume, do you mean of the whole house or just the oversite? According to my area's building control, I start with 150mm clean hardcore, 100mm concrete with A142 mesh, 1200g DPM, 70mm Kingspan, 65mm Screed. So all in all, 385mm...

Hello. I'm all shiny and new here. I've watched all the series of Grand Designs, therefore I've decided it's easy to build an extension despite not being qualified at all. To cut a long story short, the foundations are in, it's the oversite next. I've got an area of 37m2 to do, one bit...