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Thanks. I will. I guess I just wanted to see what the actual solution should be because I know he is just going to say "just put the pir down and by time you've screeded it will be fine". Not sure if it it will be

Hi My builder has poured a very uneven concrete slab for our kitchen extension. 60mm differences between highest and lowest spots. I need to lay rigid pir insulation over the top of this and then a 50mm screed, followed by tiles. What are my options to level this slab out? If I put PIR...