Stop payment on the check.
Was he supposed to be a good contractor.
I would call him back and have him tear it out and re-do it right!
The firt part of your project is wrong and now (as you said) everything else will have to be done wrong to make up for it.
It's one thing to have the pitch run out of the garrage but in all directions?
Where is the water going to collect that comes off your car/truck?
I think it's worth the battle.
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