On Feb 13, 6:39*am, Davej wrote:
On Feb 12, 9:58 pm, BobK207 wrote:

On Feb 12, 5:53 am, Davej wrote:

I've heard that hitting rebar with a diamond blade can quickly ruin it
-- so what do the experts do?

Good quality diamond blades and core bits will cut through rebar with
little more effort than concrete alone.
Water cooled is the way the pros do it.
[...]
What are you trying to do? *demo? *remodel? slab crack control?

All I want to do is install a sump system around the perimeter of a
50yo basement.

I would use a water cooled saw but I have access to a MK Diamond Walk-
Behind Concrete Saw.

If I didn't I would consider renting one or hiring a commercial
concrete demo guy. If the basement is more or less "clear" he could
zip around the edges of the slab in no time .... cutting all the way
through, which would make your job eaiser.
No mess, no dust, no noise.

If he didn't have a helper you could work with him shop vac'ing up the
cooling water to control the mess.
Set up a sump pump in a watertight trash can & you'll way to handle
the water when the shop vac gets full.

The other posts about a partial cut to prevent random cracking & a
jack hammer are good ideas but much slower and more work.

cheers
Bob