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Old 10-26-2012, 12:40 AM
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clyde clyde is offline
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Can you backfill a bore hole under a driveway?

We have to put a 4" Schd 40 pipe under a driveway. Is there anyway to get some dirt back in there?
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Old 10-26-2012, 12:41 AM
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you can use a grout or slurry pump or one of those pumps the oil tank abandonment companys use. I think its like a weak concrete mix
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Old 10-26-2012, 01:13 AM
blakescape blakescape is offline
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The red letter sch 40 pvc pipe is a lot stronger than the foam core (black letter) sch 40. Home depot only sells the cheap foam core pipe so you would have to buy it from commercial plumbing supply co like thomas somerville.

Are you putting this pipe in to run irrigation pipe or conduit to the other side of the driveway? And are you boring with a 4" torpedo mole? If so, there shouldn't be any void space on the outside of the pipe when installes and there shouldn't be a need to fill the inside of the pipe.

Last edited by blakescape; 10-26-2012 at 01:22 AM.
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Old 10-26-2012, 01:15 PM
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Quote:
Originally Posted by blakescape View Post
The red letter sch 40 pvc pipe is a lot stronger than the foam core (black letter) sch 40. Home depot only sells the cheap foam core pipe so you would have to buy it from commercial plumbing supply co like thomas somerville.
I would like to see a link to back your statement up. PVC pipe has an ASTM stamp on it which states what its rated at regardless of the color ink used. Correct me if i am wrong, it wouldn't be a first.
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Old 10-26-2012, 01:15 AM
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How much area around the pipe?
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Old 10-26-2012, 02:01 AM
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French drain from under house
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Old 10-26-2012, 08:13 AM
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Like Jim said if you missile, directional bore, or jack it under the drive there should be very little or no space to fill.
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Old 10-26-2012, 01:27 PM
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I would think the foam-core stuff is DWV pipe. No big pressure worries there.
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Old 10-26-2012, 03:00 PM
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Quote:
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I would think the foam-core stuff is DWV pipe. No big pressure worries there.
I agree boots. I don't even think that HD stocks PVC over 2 in. and i think the referance was about a styrene product rather than PVC.
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Old 10-26-2012, 03:01 PM
rlitman rlitman is offline
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Quote:
Originally Posted by Wet_Boots View Post
I would think the foam-core stuff is DWV pipe. No big pressure worries there.
It is. Sch 40 only refers to the dimensions. The DWV pipe isn't meant to withstand as much pressure, but I believe the concerns raised by the OP were related to the collapse of the hole. Regardless of the pressure the pipe is rated to contain, a solid PVC pipe will withstand more crushing pressure from above than a foam core one.
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