Help! Problem with patio
We have a new 1500 sq ft tiled patio with concrete base installed by a contractor.
During a big rainstorm, water pooled all over the patio. It was evident that the concrete base is not sloped properly to drain water away from the house.
At various edges of the patio, the elevation varies from 1/8" to 1 1/2" different from the lowest point of the patio.
The contractor admits to the defects and wants to come in and correct the problem by shaving off the high points.
What are the pros and cons of this approach?
Will this compromise the integrity of the concrete and promote cracking of the concrete and consequently the tiles?
Should we ask for them to rip out the whole porch and start all over again?
I'm not educated enough to agree or disagree with the contractor's suggested fix?
Would appreciate any help.