A botched concrete pour by a contractor to extend a patio by 150 sq.ft.
has resulted in an uneven surface. The outer region is the correct level
but the surface level smoothly slopes down to a level about one inch lower
near the center.
The contractor has suggested using a self leveling concrete pour to even
everything out. This would fill in with depths ranging from about an
inch near the center to essentially zero depth near the outer areas where
the new concrete pour meets the original patio.
How well will the self leveling concrete adhere to the surface near the
outer parts of the region where the fill depth would be essentially zero?
Should the outer regions be ground down to a minimum depth first?
Unfortunately ripping out the original pour is undesirable beacuase it was
reinforced with rebar.
Thanks for any insight and advice.