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Old 06-24-2010, 11:06 PM   #1
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Hot and cold water pipes under basement floor?


Hi. My first post!

I want to put a wetbar in my finished basement.

I've been reading about cutting the cement, jackhammering it out, digging up the gravel, and then laying the PVC pipe etc. Although I haven't put anything on paper (I may try a DIY, but not 100% sure), I believe I am fairly comfortable with what needs to be done.

The next thing I wanted to try and work through was how to get the hot and cold water pipes to the wetbar without completely destroying my professionally finished ceiling. Then a question popped into my head. If the pipes are properly insulated, can I bury the hot and cold water pipes under the cement? Is this a really stupid idea?

If you have any experience doing this, or if you know why it shouldn't be done, please share!

Thanks in advance.

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Old 06-25-2010, 12:06 AM   #2
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Hot and cold water pipes under basement floor?


It can be done --and is done frequently---I suggest PEX--that is the tubing that is used for hydronic floor heating. Nice--one piece no joints.

As to the method of installing so you don't loos heat--I'll leave that to someone with more experience.

---Mike---

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Old 06-25-2010, 12:34 AM   #3
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Hot and cold water pipes under basement floor?


Awesome! Just hearing that this is done has made my night. I am familiar with PEX --it's nice and easy to use. Do you suggest laying the pipe in the concrete, or under it in the gravel?

Thanks for your reply, oh'mike!

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Old 06-25-2010, 12:44 AM   #4
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Hot and cold water pipes under basement floor?


FYI - If you don't know exactly where the 4" main building drain is located under the slab, save yourself some time cutting/jack-hammering and have it located first.

Secondly, I would bed the pipe in sand and like Mike said all one piece, no fittings under concrete.
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Old 06-25-2010, 01:01 AM   #5
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Hot and cold water pipes under basement floor?


Thanks for your reply, LateralConcepts. I know where the 4" stack is, but I have not yet taken the time to inspect the main clean out to determine which way the main drain goes. If I can't work it out, I'll get someone in for sure (I know my limits).

Would sand be sufficient as an insulator for the hot water pipe, or is there something more I can do? Is that black foam stuff okay to use on PEX tubing?
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Old 06-25-2010, 01:25 AM   #6
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Hot and cold water pipes under basement floor?


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Thanks for your reply, LateralConcepts. I know where the 4" stack is, but I have not yet taken the time to inspect the main clean out to determine which way the main drain goes. If I can't work it out, I'll get someone in for sure (I know my limits).

Would sand be sufficient as an insulator for the hot water pipe, or is there something more I can do? Is that black foam stuff okay to use on PEX tubing?
You're welcome. Yeah split foam would be fine, or pipe wrap.
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Old 06-25-2010, 06:51 AM   #7
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Hot and cold water pipes under basement floor?


Good morning! I am feeling much better about this, now.

One thing I failed to mention was that I am in Kingston Ontario Canada. Are you aware of anything I need to worry about in a region that sees all 4 seasons? My basement floor is at least 6 feet below ground level, so I believe I'm definitely below the frosts line.

Thanks again for your replies.
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Old 06-25-2010, 07:01 AM   #8
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Hot and cold water pipes under basement floor?


You will be fine as far as the cold---Pex has the best freeze thaw tolerance of any water pipe.
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Old 06-25-2010, 09:10 AM   #9
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Hot and cold water pipes under basement floor?


Quote:
One thing I failed to mention was that I am in Kingston Ontario Canada.
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You will be fine as far as the cold---Pex has the best freeze thaw tolerance of any water pipe.
Good mornin'! Without looking at a map I'm not sure where Kingston is, but unless you're in the arctic I highly doubt you would ever have a problem with freezing @ 6'+. In my area frost line is only about 32". I'm in Northern Idaho. About 100 miles South of the Canadian border.

And like Mike said PEX is amazing when it comes to expansion and contraction.
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Old 06-25-2010, 09:33 AM   #10
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Hot and cold water pipes under basement floor?


I really appreciate your help guys. I won't be starting this project for at least a couple of months, but thanks to you I'm comfortable with the concept! I feel like a big weight has been lifted off my shoulders, knowing that I shouldn't have to rip out my ceiling!

When I kick this off, I'll post pictures of the progress in this thread.

Merci Beaucoup, great first posting experinece.
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Old 06-25-2010, 09:47 AM   #11
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Hot and cold water pipes under basement floor?


Have you investigated possibly running the water lines in the wall? If there is a chance to run the pipes low in the wall to the bar sink I would try that route before going under the floor. I have put water lines under the floor before, but it was to an island sink in the middle of the room where no other path was available.
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Old 06-25-2010, 09:48 AM   #12
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Hot and cold water pipes under basement floor?


Good to hear! Yeah please post pics. I like bars. I just built one in my garage (man cave). Still have some more to finish.

Oh and I looked at the map. I now know where Kingston Ontario is. Do you do any fishin' up there?
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Old 06-28-2010, 06:28 PM   #13
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Hot and cold water pipes under basement floor?


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Have you investigated possibly running the water lines in the wall? If there is a chance to run the pipes low in the wall to the bar sink I would try that route before going under the floor. I have put water lines under the floor before, but it was to an island sink in the middle of the room where no other path was available.
Hi, The Engineer. I did think about it, but it's the same issue with the walls as with the ceiling --it was professionally finished. Additionally, I would like the sink to be in the bar portion, so it won't back up against the wall.

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Oh and I looked at the map. I now know where Kingston Ontario is. Do you do any fishin' up there?
Only very recreationally! I enjoy fishing, but, unfortunately, I haven't really taken the time to pick it up as a hobby. A bunch of buddies of mine go out a lot, they say it's pretty decent around here.
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Old 06-28-2010, 07:56 PM   #14
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Hot and cold water pipes under basement floor?


I hear the 1000 islands are great for fishing. I just drove through Kingston on my way from Oshawa to Albany NY....i almost drove off the bridge over the islands after seeing the view!

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