Slab Preparation
I am having a slab out down soon for the back of the house which has been demolished. The builder has left all the pre-existing bluestone footings an all the other concrete that he has jack-hammered up from the floor during the demo in 3 piles with what look like trenches around theses- resembling the said/soil minds used in slabs. The surface is all uneven as there are bits and pieces of hundreds of broken concrete /bluestones/rubbish etc. My guess is that he will just want to pack over the top of these with sand to get an even level before bagging and the pouring the concrete. Does this sound like normal practice? Or does the builder need to get all the excavated rubbish including broken stones, rubble etc. out of the site and then start to dig and make the mounds with the dirts/sand etc? What are the ramifications of leaving the rubble acting as the 'mounds' in the slab? Will this provide more stability for the slab later or cause problems? In the photo you can see what I mean by the rubble being used as the mounds for the slab and the clear bits for the footings
thanks in advance
Bob
oklouise