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Thread: New Construction Plumbing Layout

  1. #1

    Default New Construction Plumbing Layout

    I'm on the final phase of my home plans but the plumbing layout has me stumped. I'm including an attachment in the hopes a plumbing person can tell me if I'm going in the right direction. I have no idea how to layout this pipe work...Only guessing at this. House is on a raised foundation and I'm in Southern Calif if that helps. Thank you
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  2. #2
    In the Trades kordts's Avatar
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    Default

    Don't run at bastard angles. Everything needs to be squared off the floor joists. I would run a 3" main drain.

    Helpful Plumbing Hints for Residential Construction by Bert Polk Plumbing Inspector Lincoln County
    Last edited by Terry; 05-24-2010 at 03:17 PM.

  3. #3
    Master Plumber master plumber mark's Avatar
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    Talking a little sloppy

    of course you are going to get a whole bunch of opinions here
    just like when you ask directions from a crowd of people...

    so get ready for a big debate..

    The only thing that I would certanly change..is the kitchen line

    come off the 4 inch well before you get to the bathroom
    to run to to the laundry.....run 2 inch over into that area.....

    Shoot directly for the laundry makeing it the MAIN run.. then come off with a wye along the way for the kit ....vent both together above the floor going out the roof or whatever is code...for vents.

    you dont want all that laundry water to come crashing into a joint at
    the kitchen and then makeing a turn...you want it to flatten out
    in the pipe before it passes the kitchen......if that makes sense ...
    -------------------------------------------------------------------
    The bathroom is probably ok because you are running a 4 inch
    drain.... but you will get many opinions here...


    but I would probably kill that double wye under the floor.
    (personal preference) Though it probably would work ok
    being so large a pipe and a vent going to the lavaroty
    in the same joint.......that is up for debate......


    come off the line going to the lavatory with a wye for the drain to the shower which gives the shower a wet vent off the lavatory do all this in 2 inch.... ( again personal preference)

    either way will probably pass ok

    of course the lavatory vent going out the roof is the vent for the whole bathroom group , I dont know what size vent is legal in california, but here I can get away with a 1 1/2 vent

    have fun fun fun
    Last edited by master plumber mark; 09-18-2006 at 01:23 AM.

  4. #4

    Default

    If it's a raised foundation, then is there any reason to run through the center of the floorplan? Why not run the laundry/kitchen line 'west' to the nw corner of the house, then south along the foundation. Similarly, the bathroom gp would run 'south' and then at the southern wall of the foundation, turn west to the septic.

    Supporting the drains against the foundation instead of the floor joists can reduce the noise transmission thru the floor.

    Also this way yr vents can run up the external wall instead of trying to finagle them through interiors.
    (important note: I'm not a pro)

  5. #5
    Moderator & Master Plumber hj's Avatar
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    Default plumbing

    The picture looks good as a general idea, but so has every other plan view of a plumbing system. The real test is when you do the actual installation because that is when all the vagaries come in that cannot show in a drawing such as yours. It is also the reason building departments want isometric drawings because they also show the vertical pipes and how connections are being made.

  6. #6

    Default

    definately move your wye for the kitchen and the wash box further back behind the bathroom group. you don't want the washer dumping water into the main drain ahead of the bathroom group.

  7. #7

    Default Revamped Plan - Am I getting close?

    I want to thank everyone for there response to my questions. I hope I'm heading in the right direction on this. I like the idea of running the pipe along the outside, it just looks cleaner. However, I'm no plumber so please let me know if this is not acceptable. I have other questions..

    1: Kitchen vent, can I vent both the washer and kitchen sink through the outside wall (note where circle and arrow are placed)? I made that whole line 2" and vent 2", is that correct?

    2: Bathroom - will I need three separate pipes that go up into the attic for venting, then put all of them together so only one vent comes out of the roof?

    3: I understand the bath sink needs an S trap and a bathtub also needs an S trap. However, I just have a shower so I need to find out if the shower is the same as a bath.... needing an S trap or can I just us an elbow?

    Here's the new sketch:

    Thanks again,
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  8. #8
    Master Plumber master plumber mark's Avatar
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    Talking it is not that good

    it actually looked better the first way you had it

    all those bends around the corners of the house are

    only going to clog up someday...

    and a longer run to have to clean out someday


    though I dont know if this is a basement or a crawl space

    if it is a crawl I would go the path of least resistaqnce


    It will all work out.....

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  9. #9
    Moderator & Master Plumber hj's Avatar
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    Default plumbing

    You are regressing and making the system worse. I install the plumbing the most direct and shortest way possible. With that in mind, I would put the vertical stack behind the lavatory. The toilet would connect with a fitting we call a "Wisconsin", Chicago calls a "cottage tee", and MA calls an Easterbrook, which would be angled towards the toilet's location. The 2" side branch would go to the tub. If the distance were too long then I would install a secondary vent on it.

  10. #10
    Homeowner geniescience's Avatar
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    Default

    draw Wye's not T's where you intend to put Wye's.

    Don't call p traps 'S traps'. Showers need P-traps. Everything needs a P trap. Except toilets, as they already have one inside at the bottom of the bowl.

    Put a Wye near the toilet, to connect the sink. Put another Wye downstream, but still close, to connect the shower. This will give better venting that will ensure the toilet flushes as it was designed to. Otherwise it may swirl water for a second or two, and then whoosh fast and even open up its P trap letting sewer gases come out before the fill mechanism fills the bowl and tank again.

    A single vent for your bathroom group is sufficient. 2". If the vent can go to your sink, then your shower will have venting upstream of its Wye. This is good.


    I am not a plumber. Not do I play one for friends and family.

    david

  11. #11

    Default

    I don't believe it's ok to vent plumbing vents THROUGH the outside wall ( exhaust fan/hood vent/dryer vents are ok). Plumbing vents release sewer gasses which can be harmful to people, so there are clearance requirements from windows and doors. The safest thing is to vent through the roof.

    I'm not a pro, so I defer to their opinion that plumbing lines shld be as straight and short as poss. How big is the space under the floor? If it's a basement, then going down the center of the ceiling cuts the head space. I think that's why the bldr did it that way in my home (although I do have a spec house from a nat'l builder, and there perhaps there were cost-cutting reasons they did it...)
    Last edited by prashster; 09-19-2006 at 05:36 AM.
    (important note: I'm not a pro)

  12. #12

    Default Lets try again..

    Ok, I went back to the old print and hopefully I was able to understand what I was suppose to do. I had no idea it was this hard to put this together. I changed some things. I also forgot to put in the main water line and where to connect it to. I can do most things but plumbing is NOT one of them as you can well see. It just isn't sinking in.
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  13. #13
    Plumber Cass's Avatar
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    Default

    O.K. instead of going from the 4" line to the kitchen go directly to the washing machine, straight line, and use 2" pipe. Then go from the kitchen to the 2" line.

    Your drawing has it the other way around.

    A bathroom on the second floor using flat venting and wyes.
    Vents below 42" need to be waste fittings.

    Added by Terry Love
    Last edited by Terry; 06-02-2010 at 02:26 PM.

  14. #14
    Homeowner geniescience's Avatar
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    Default all Wyes, see below.

    not hard, no worry, eyeglow. Your last drawing is good.

    In addition to the two Wyes marked as Wyes you have two other ones. However, it is obvious that they are Wyes since the geometry of the lines shows their shape. If you write that two are Wyes, and not the other two, you raise doubts and questions. OK, I know I'm picking nits.

    I drew a line drawing. I'm not there, I don't have a view, I can't see what challenges you really have -- so do not rely on my ideas, or on this drawing, for anything other than the fact that it shows some concepts.

    You read earlier that master plumber Mark said to make the washing machine line a straight line. Cass just said it again a few minutes ago. That is what I drew here.

    I drew a little circle near the bathroom sink, on the drain line. This is where I might put a vent going up inside the wall. I repeat, that I am not on site, nor do I want to be. You will do things differently, because you have to. There is a limit as to how much you can get done over the phone when the expert is not on premises. Worse, I am not an expert, and I have not seen your place even once. Reality will dictate other solutions. Let this be understood.

    I might use a 3" diameter pipe for the toilet. Either all the way to the outside, or up till the last connection, or up till the shower connection. That could be worth a discussion here. Reason: solids flush better in a 3" pipe -- proven in a CMHC study, which I might be able to locate and point to later.

    david
    p.s. You can right-click on the image and "save as" or copy onto your computer. Size is 4k.
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    Last edited by geniescience; 09-20-2006 at 05:55 AM.

  15. #15
    Moderator & Master Plumber hj's Avatar
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    Default pipe size

    Because of velocity issues, a larger pipe than necessary is not always a desirable thing.

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