Please note that this is also known as concrete trenching depending on who you ask.
The photo taken on the right was done in an owner-occupied home, it had to be done dust free, we did not use plastic and we did not use water, you will see on the video how this is all done.
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Typically a channel will be between 4 and 6 inches wide. The concrete should only be 4 inches thick.
Here is a video showing some of the channeling on a residential home that we did in December of 2017: