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I have a set of concrete stairs, 4 steps, that I want to widen. My question is does anything have to be done to where new concrete meets existing concrete, or should I just drill into it and extend...

4 ft. high, 14 ft. long between a garage and another existing wall, using 6X6X16 slump stone.

4 ft. high, 14 ft. long between a garage and another existing wall, using 6X6X16 slump stone.

Southern California, no frost !

I'm building a 3 foot block retaining wall, have a 2 foot wide, 2 foot deep footing dug.
How many horizontal pieces of rebar should be in the footing and where should thet be placed?