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So I have had a ten ton digger pecking rock out to make way for a basement and extension. Was planning on 200mm EPS under the slab, and 200mm EPS around the exterior of the basement walls. I do have two walls against the existing house to retain the house founds, as well as creating the basement walls. SE has categorically stated he will not entertain EPS300 under the slab. We are on solid rock for almost the whole slab. It is supporting three stories above. Some pics showing existing founds etc. Was going to use Jackodur system as it also creates the former to pour the concrete too. I was initially concerned when we exposed the existing house founds and the SE had a fit and demanded all work stop, until the house was underpinned. However I elected to continue and pecker out the rock, wether through luck or judgement the house is still standing. So now I either accept the SE proposals or find another one for a second opinion. Rebar sched2 (1).pdf SE version2.pdf