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Jetting water line under driveway
Posted on 4/9/21 at 2:03 pm
Posted on 4/9/21 at 2:03 pm
So, I need to run a 3/4” water line and a 1” conduit “through” a driveway that’s 25’ wide. Has anyone here jetted pipe under concrete that far? I’d like to avoid cutting into the driveway (and paying for it), which the plumber is telling me he’d have to do. 
6
Posted on 4/9/21 at 2:13 pm to GeauxldMember
It can definitely be done but I'm not sure you will end up paying less than the cutting the concrete method.
Posted on 4/9/21 at 2:28 pm to GeauxldMember
No other way to access the other side? Like all the way around the house?
Posted on 4/9/21 at 2:32 pm to Coon
Rent a walk behind wet concrete saw and do it yourself. You could either cover it up again or put a channel drain on top of the conduit so if you ever had to dig it up again it would be pretty easy.
Posted on 4/9/21 at 2:40 pm to GeauxldMember
It'd be tough, but 12.5' each direction does sound doable. Steering might be an issue. 25' your water jet/hose/pipe seems like it could drill any direction it wanted. You might get 8' in and it decides it wants to go down instead of straight.
My random theory is you use the hose end jet, go as far as you can. Back it out and insert a 2" pipe into the hole. Then back in with the hose jet into the pipe. Rinse and repeat.
My random theory is you use the hose end jet, go as far as you can. Back it out and insert a 2" pipe into the hole. Then back in with the hose jet into the pipe. Rinse and repeat.
Posted on 4/9/21 at 2:47 pm to RaginCajunz
We used to bore under with the pipe intended to be the conduit.
Put one of these in the end and slowly wash your way through. Works for 3/4 prettt good.
Not sure if there is a 1" version.
Put one of these in the end and slowly wash your way through. Works for 3/4 prettt good.
Not sure if there is a 1" version.
Posted on 4/9/21 at 2:56 pm to Coon
quote:
No other way to access the other side? Like all the way around the house?
Unfortunately not.
Posted on 4/9/21 at 3:00 pm to fightin tigers
quote:
We used to bore under with the pipe intended to be the conduit.
Put one of these in the end and slowly wash your way through. Works for 3/4 prettt good.
Not sure if there is a 1" version.
Could always just adapt it for the 1”. Problem is, with the flex in 3/4 and 1”, I may end up in BFE by the time I get 25’.
Regardless, it’ll be cheap enough to try it before I cut any concrete.
Posted on 4/9/21 at 3:47 pm to GeauxldMember
I jetted under my 20’ wide driveway with 3/4”pvc pipe. I put a cross fitting with nipples/caps on the branches to use as handles, with the garden hose connected upstream of the cross. I cut and glued more pipe as I went, always having the two handles out of the cross to use for pushing/pulling. I laid on my stomach on the driveway doing the Ace Ventura “can you feel it baby” motion all day. I used a slip to female pipe adapter on the leading end with a brass male thread to hose barb adapter, not realizing they actually sell a fitting for that purpose. Look for a jetting fitting. I now know rainbird the sprinkler company sells one, maybe others. It was also along a highway so there was a lot of aggregate rock that I had to work through. So minus the rock and minus the shoulder of that hose barb fitting i used, I would think that what you propose is doable if you’re willing to get really dirty and work at it all day. You’re plumber apparently is not. Prepare for a whole day’s work. Also, dig a 10’ or so trench to lay your feed pipe in so you’re advancing straight forward. Also, have a side trench and place for that water to drain from running water full time. I eventually got the 3/4” all the way through and then attached direct burial 12c/3 cable to the pipe, and pulled it through with my truck. 16 years later the water line still feeds my sprinklers and my shop on that side, as well as my driveway light. When it came to running a 2” sewer lift station discharge and 2” conduit for my shop, I cut an 8” channel through the concrete. But doing that not only requires renting the machine, but most places require you to purchase your own blade because they’re about $100. I lucked up and knew somebody who had recently bought a blade. So I don’t have to. But cutting a driveway and removing the concrete is a lot of work too, even with good equipment. Then you have to repair it. I re-poured the channel when I poured my shop slab, which is what I had cut it for already. I used a 4x6 timber set in it to drive over while I waited for the pour. But I wouldn’t have cut my driveway for a 1”” without first trying to jet it.
Posted on 4/9/21 at 3:53 pm to GeauxldMember
quote:
Problem is, with the flex in 3/4 and 1”, I may end up in BFE by the time I get 25’.
This is where the trench comes in. If your pipe’s entire length is laying flat in a trench instead of angling down into the ground, it should follow the concrete ceiling and stay straight left to right as well. Mine did. Came out straight across and just under the concrete
Posted on 4/9/21 at 4:46 pm to Tiger-Striped-Bass
quote:
This is where the trench comes in. If your pipe’s entire length is laying flat in a trench instead of angling down into the ground
Yep. If the driveway is 20' wide you need to dig a 20-25' trench back. Start washing right under the concrete and hope whoever did your driveway didnt leave the middle low.
Never experienced flex in the pipe that made much of a difference.
This post was edited on 4/9/21 at 4:46 pm
Posted on 4/9/21 at 4:59 pm to Tiger-Striped-Bass
Good info. I don’t mind getting dirty. 
Posted on 4/9/21 at 6:30 pm to GeauxldMember
Get a 20’ piece of tubing and attach to end of pressure washer. It will bore hole under slab. Use piece of conduit to case the hole, just don’t look down it when you pull trigger on wand.
Posted on 4/9/21 at 8:20 pm to Capt ST
That’s actually a pretty solid idea, thanks!
Posted on 4/9/21 at 10:40 pm to GeauxldMember
It can get a little messy, but it’s same concept as jack and bore. But you’re going to get blow back since you’re using a HP tip instead of auger to remove soils.
Posted on 4/10/21 at 7:43 am to GeauxldMember
This seems like it will result in an awfully shallow installation. Would it freeze during another brutal winter storm like in February?
Our frost depth is 18 inches
Our frost depth is 18 inches
Posted on 4/10/21 at 9:42 am to Capt ST
quote:
But you’re going to get blow back since you’re using a HP tip instead of auger
Wear goggles. Noted.
quote:
This seems like it will result in an awfully shallow installation. Would it freeze during another brutal winter storm like in February? Our frost depth is 18 inches
I’m just outside NOLA. No frost line issues here. If a water line ~6” underground freezes, I’ve already got wayyyy bigger plumbing issues to deal with.
Posted on 4/10/21 at 4:42 pm to GeauxldMember
quote:
If a water line ~6” underground freezes, I’ve already got wayyyy bigger plumbing issues to deal with.
Wow. Different world down there
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