I have spent the best part of the last two weeks putting down the type 1 for our slab, 150mm thickness in three layers, 59T in total over 127m2. It's done now but just walking on it you get a good impression of how solid it is. It set me wondering. I weight about 100kg, I am 6'4", my site boots have a ground area of 0.0225m2. Our building will weigh in at around 70T so across the whole slab that's about 583kg/m2 while I put much more that down on the area of my foot, about 4000kg/m2. This slab is not going to move anywhere. Is that overkill or what.