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Hi After closing our site up in December due to the weather, we are trying to get back up and running. We have poured the raft foundation and built the retaining walls which also form the basement. There is a beam and block floor sat on top of the retaining walls. This forms a new kitchen floor, and also an outside terrace. Between them I need to start building a cavity wall with 150mm cavity off a pair of UC beams, which have carried some of the B+B concrete beams. How can i reduce the thermal bridging, and also close the cavity? Could I bridge the cavity with some PIR and build off that, or is it likely to compress too much. The basement room below is a store/workshop. The block wall is only two courses high to form an opening for a 2.6m wide sliding door onto the terrace.
My design is moving on and I now have an ICF supplier (wall and slab) (Econekt) and a Structural Engineer is working out all the details, which means I have 3-4 support posts (Steel) within the original internal wall structure, 2 x steel beams and 250mm thick Widespan planks to make up the first floor (8.6m spans). What this means is that all my internal walls can now be anything, ICF / Block / Stud, with no requirements for thermal insulation the question is what will provide me the best sound insulation?