We ended up having to remove entire walls to get at the plumbing and and put new 2x6 stud walls in so the thickness would match the other walls.The windows and door frames where set in place and concrete was poured around them.

You will need to be thick skin some will be willing to talk with you and others will not.

So it says meet 100 MPH wind speed and ANSI 1234 which for plywood is a minimum of X/X" thick sheathing fastened with X nails every X" OR fastened with Y staples every Y".

We basically painted it, and then poured a self leveling resin that hardens to a thick finish and looks like glass.We chose this route because I didn't like the finish of the countertop specific options, I wanted the glass-like look to them, as most fancy countertops would have. 

He's probably quoting 4 inches thick, which is adequate for most patios.  

You learn to get thick skin though, now I have to laugh.  

Other $$ possibilities are available for quartersawn (but more waste).Now go kick yourself.PS put your calculator away, I'm not telling how thick a slab is.

Gotta have thick skin to deal with those people...

At $1000 I'm still in the thick of the bell curve.

I always did a minimum of 2" thick. most likely you will have to bust it back up.