Step 5 create a groove in the new mortar with a round nosed trowel.
Cutting a trench in concrete slab.
Extend the groove the length of the fresh mortar.
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The slab was about 4in thick with wire mesh and a plastic barrier between the concrete and the wet clay like soil home located in new orleans.
Concrete slab repair for plumbing trench i ve just cut several trenches 2 3 ft wide x 25 ft long in my existing concrete slab to run plumbing.
Don safety glasses hearing protection and steel toed boots for protection.
Allow at least 48 hours drying time.
Check to make sure there are no electrical or plumbing lines.
With the jackhammer cut the drainage channel down to where you dug the trench in your yard so that the water will flow in the correct direction.
Make sure the groove is at least 1 inches deep and at least 3 inches wide.
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Locate the area of the concrete floor where you would like to cut the channel.
Step 5 install the pipes to finish the job mix the cement and spread a layer about 3 inches thick around the mouth and sides of the drainage channel.
How to cut a partial trench in a concrete slab using model in place void extrusion.
Set the diamond blade on the concrete wet saw to a depth of 4 1 2 inches and cut along both chalk lines.