Walter R. wrote:
I need to cut 2 control joints in my 4' concrete patio slab, each 11 feet
long.

Can I do that with my old circular hand saw? Would I use a masonry blade
(the clack stuff) or a do I need a diamond blade (expensive)?

How deep should the control joint be?

--
Walter
www.rationality.net
-

On small jobs like yours we use a skill saw with a diamond blade.
Typically we go 25% of the thickness of the slab.


What are the dimensions of your patio?