Put down a screed for a regular builder today, gave him the amount of materials I wanted last week. He told me it wasn't a fibre screed or as he said 'nothing fancy' if you know the type. he told me insulation at 100mm and at max 100mm screed. concrete base ran out and ended up with a 180mm screed. He managed to get more sand in the afternoon and still not high enough. about 30mm lower than what it should be. Should I of came higher? Sounds a lot to me. Does anyone screed that thickness? Surely that wouldn't last? I'm assuming as the base was incorrect then more insulation is needed.