OK previously I had to cut a small trench (4" wide) in my concrete slab in
the kitchen to bury a drain pipe for the sink in the island. The trench was
9' long I cut it with a angle grinder and a demo hammer drill and it was not
too bad, I put the 2" PVC drain in and poured concrete over it no problem.
Now I have to cut two more slots to accomodate a new 3/4" PVC electrical
conduit, one in each slot. The length is about five feet, see the diagram
below for my floor plan.
What is shaded in magenta is the concrete slab for the interior part of the
house, the upper left corner in blue is the garage where the slab is 6"
lower in elevation.
The slab is 4" thick and it continues to the interior courtyard (shown in
yellow). The cyan color area is the pool. You will see that there are
several planter areas in black. On the left side you should see two thick
red lines. I need to run a 3/4" PVC electrical conduit along those lines.
Because of the fact the cut especially the one on the upper left is going to
come pretty close to the garage on one end and the planter area (no slab
there) on the other. I am concerned about cutting a trench there will cause
a crack that will never really heal and will become an "expansion joint" of
So my question is, what is the least destructive way to accomodate the 3/4"
(1) Cut a slot about 1" wide and 1" deep, put the pipe in, pour concrete to
seal off excess space then lay pavers back on top.
(2) Cut a 1" slot all the way through the 4" slab, put the pipe below the
slab then put back concrete and paver.
(3) Excavate the planter area soil down to 3 or 4', then do a mini tunnel
with the pipe to try to bridge the 5' length below. Then break a small
opening on the other side near the wall, and put in an elbow to the pvc
pipe, that way the slab is not being cut at all...however I can see many
things that could go wrong.