How deep does PVC need to be in concrete slab?
#1
09-28-12, 07:39 AM
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How deep does PVC need to be in concrete slab?
OK in preparation for the kitchen island - I'm cutting a channel into the slab to run electric (about 2' from the wall)- I cut down about 2.5" and about 3.5" wide in the concrete - I rented a power chisel. To go deeper seems to really be a challenge- Can I lay the PVC in and cover with concrete from here? What determines the depth that it needs to be? I can't see weight being an issue- Once the concrete hardens around the PVC and the floor gets installed.....thoughts? suggestions?
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#3
09-28-12, 08:49 AM
PVC is my second choice for conduit in concrete. My first choice is smurf tube, for ease of working. No metal pipe or fittings in concrete - they will corrode.
That said, 1-1/2" to the top of the pipe seems a bit shallow. I like 4" of concrete over the pipe, even when that means that the bottom of the pipe is lying on the gravel bed. Slicing the slab with a diamond-tipped circular blade on the end of a saw before hammering the center out makes the work go faster. A masonry saw should be available for rent locally.
That said, 1-1/2" to the top of the pipe seems a bit shallow. I like 4" of concrete over the pipe, even when that means that the bottom of the pipe is lying on the gravel bed. Slicing the slab with a diamond-tipped circular blade on the end of a saw before hammering the center out makes the work go faster. A masonry saw should be available for rent locally.
#4
09-28-12, 08:58 AM
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Thanks Nashkat- what is the downside to not putting it 4" ? Will it affect the integrity of the conduit or the finished floor?
#7
09-28-12, 12:55 PM
Welcome to the forums!
When you say
are you saying that the pipe should be deep enough that the bends should finish below the surface, and the pipe emerge as a vertical run?
When you say
You need to make room for the turns or elbows you are using bends correct?
#8
09-28-12, 12:56 PM
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yes elbows fit fine when I test fitted them
#9
09-28-12, 01:43 PM
yes elbows fit fine when I test fitted them
While you do need a continuous run of conduit, guarding against damage during the wire pull is not really a concern with a little run like this. If they fit fine and turn up where you need them, you should be good.
#10
09-28-12, 01:46 PM
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3/4" PVC elbows .....hope that helps
#12
09-28-12, 03:56 PM
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PVC under a building, the required depth is 0". I like to put it just below the concrete.
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