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So not buy that Makita cordless saw. It will take aboout 2 years to cut your 1" thick slab. That thing is good for cutting a little of 1/4 thick tile. You need a saw with a bit of power. Check out a worm drive saw. They run a about $160 at home centers, I like skill or Bosch. Pretty much the same saw. A 4 1/2 inch angle grinder will work. but slow for 1" thick stuff.
Am I getting this right, you want to saw cut the slab that's already there? Expansion joints? Why. If its an old slab, and it isn't crack, what make you think that it will crack with the flag stone? YOu want to set it directly on top of an the slab that's there, right?
Jeff
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