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Started By
Message
Setting a 4x4 fence post in concrete on top of 2" schedule 40 pvc pipe
Posted on 3/20/22 at 8:13 pm
Posted on 3/20/22 at 8:13 pm
Can you safely set a 4x4 fence post in concrete on top of 2" schedule 40 pvc pipe? Specifically, there are 5 pvc lines for my pool approximately 2' below ground. Finished height of fence will be 5'. Would it be safe to dig down say 16" , leaving 8" of soil/clay protecting pvc?
Due to the direction of the pipes and the specific location, I cannot very easily put the post in another spot. I would have to dig up every other post I already set. This is the last one and only issue.
Thanks.
Due to the direction of the pipes and the specific location, I cannot very easily put the post in another spot. I would have to dig up every other post I already set. This is the last one and only issue.
Thanks.
This post was edited on 3/20/22 at 8:28 pm
9
Posted on 3/20/22 at 8:16 pm to MaxDraft
I wouldnt do it
Posted on 3/20/22 at 8:17 pm to MaxDraft
Going to be a pain in the arse if there is ever problems with the pool pipes
Posted on 3/20/22 at 8:17 pm to MaxDraft
Don't see why not. Just tamp the base good and possibly even add a preformed concrete base they sell at Lowes for extra rigidity.
Posted on 3/20/22 at 8:18 pm to MaxDraft
Do you have no other option? That's going to make it incredibly difficult on you or the next guy to deal with any leaks or other issues.
Posted on 3/20/22 at 8:19 pm to MaxDraft
quote:
leaving 8" of soil/clay protecting pvc?
If you are asking if that is enough to keep the concrete from damaging the PVC then yes. Keep in mind PVC is used in concrete all of the time when pouring slabs but only for drain lines. The only issue I see is if you need to make repairs to any of the PVC in the future.
I would consider setting the post with the foam fence post kits since it is easier to remove in the future if need be.
This post was edited on 3/20/22 at 8:21 pm
Posted on 3/20/22 at 8:20 pm to MaxDraft
Post this on the home and garden board for some expert opinions, but I would dig down to the pipe, obviously being careful, put 2-3 inches of concrete and a little water on top of the pipes let that set, then come back and set the post, and might go with a galvanized steel post there because you will be giving up depth so you could use a 3” pipe and have more concrete, but 16” deep ain’t good enough for me
This post was edited on 3/20/22 at 8:44 pm
Posted on 3/20/22 at 8:23 pm to Tigerpaw123
quote:
Post this on the home and garden board
Yep. Sorry. Thought I did
Posted on 3/20/22 at 8:25 pm to MaxDraft
I moved this post to H&G board
Posted on 3/20/22 at 8:26 pm to MaxDraft
Do you have room to reroute the pipes? It’ll be more work, but it may solve your problem.
Posted on 3/20/22 at 8:27 pm to MaxDraft
Never take this kind of advice from Sao.
Anything beyond a flat head screw driver is out of his zone.
Anything beyond a flat head screw driver is out of his zone.
Posted on 3/20/22 at 8:32 pm to Tigers35
quote:
Do you have room to reroute the pipes? It’ll be more work, but it may solve your problem.
Technically, yes. But I'd have to pump pool water down 3' or so to drop level below those pipes so I can cut into them. There's also 5 that I'd have to reroute. I'm not worried about having to get to the pipes later if needed. I'm fine just digging up the post. My concern is how much dirt do I need to have between pipes and bottom of concrete. I don't want to break the pipes. Thanks
This post was edited on 3/20/22 at 8:38 pm
Posted on 3/20/22 at 10:36 pm to MaxDraft
quote:
approximately 2' below ground
They are never as deep as they should be.
quote:
Post this on the home and garden board for some expert opinions
Reading this on the H&G board (after thread moved) cracked me up.
quote:
My concern is how much dirt do I need to have between pipes and bottom of concrete. I don't want to break the pipes.
In practical terms, you really don't need much. A fence post (especially with concrete) isn't really putting that much axial load even in wind. PVC pipe is actually very strong, especially underground. Like mentioned above, you can spread the load with crushed stone and a small footing ~6"+ over the pipe.
However, I'd really relocate pipe or post.
quote:
Due to the direction of the pipes and the specific location, I cannot very easily put the post in another spot. I would have to dig up every other post I already set.
I challenge these statements. There is always a way to get creative with a fence.
I feel like we need a MSPaint sketch of the situation to move forward.
Posted on 3/20/22 at 10:58 pm to MaxDraft
Put the 4x4 footings 20-22” below grade, provided the UG pvc pipes are indeed 24” below grade.
Posted on 3/21/22 at 6:42 am to MaxDraft
You have enough space between the lines to wrap them with a piece of foam insulation?
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