(206) 949-5683, Top Rated Plumber, Seattle
Results 1 to 9 of 9

Thread: Laying out Rough-in for new Bathroom in Slab

  1. #1
    DIY Junior Member 1db2's Avatar
    Join Date
    May 2013
    Location
    San Jose, CA
    Posts
    6

    Default Laying out Rough-in for new Bathroom in Slab

    I would appreciate help laying out a new bathroom I'm building off the master bedroom into the garage on a slab. I'll be cutting through about 20 feet of slab to reach the main, outside, 4 feet underground. I've done a lot of home plumbing but am stuck designing the correct layout for this bath. The fixtures cannot be moved as I have very little space to work with and don't want to lose the garage for parking. I would like to lay it out like #1 but read something about not placing a toilet upstream of other appliances, so I came up with #2.

    I don't know if either of these will work and would appreciate any feedback.

    Thanks


    Name:  garage bathroom_001.jpg
Views: 484
Size:  31.4 KBName:  garage bathroom_002.jpg
Views: 451
Size:  35.1 KB

  2. #2
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,615

    Default

    If we could not connect a toilet "upstream" of other fixtures, builders would be severely limited as to how they could design their bathrooms. Either drawing is workable as far as the concept is concerned, (I might not do it either way, but that is a personal preference). HOW you actually install the piping is the important thing.
    Licensed residential and commercial plumber

  3. #3
    Forum Admin, Expert Plumber Terry's Avatar
    Join Date
    Aug 2004
    Location
    Bothell, Washington
    Posts
    14,191
    Blog Entries
    1

    Default

    You can use the lav to wet vent the toilet if you have 2".

    The shower has to be vented before it hits the downhill side of the toilet waste. If you have wyed off for the shower and vented between the 3" and the shower trap.

  4. #4
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,615

    Default

    Since he has "depth", he could install a 3x3x3x2 side inlet tee under the floor at the lavatory. The 3" branch would point to the toilet, and the shower would connect to the 2" inlet. The sink would connect to a 2x1 1/2" tee in the "vent" riser.
    Licensed residential and commercial plumber

  5. #5
    DIY Junior Member 1db2's Avatar
    Join Date
    May 2013
    Location
    San Jose, CA
    Posts
    6

    Default

    When you say "The shower has to be vented before it hits the downhill side of the toilet waste" do you mean the shower vent physical elevation must be higher before it turns vertical than the beginning elevation of the toilet discharge line?

    Here's another drawing to reconfigure the lavatory drain from the previous drawings:

    Name:  Bathroom 3.jpg
Views: 372
Size:  38.8 KB

  6. #6
    DIY Junior Member 1db2's Avatar
    Join Date
    May 2013
    Location
    San Jose, CA
    Posts
    6

    Default

    Are you saying to run the main 3" line to the 3x3x3x2 side inlet tee near the lav and branch out from there to all fixtures? That's a cool fitting. Thank you to all.

  7. #7
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Location
    Cave Creek, Arizona
    Posts
    25,615

    Default

    Not 'near" the lav, but centered behind it so the riser and tee are right in line with it.
    Licensed residential and commercial plumber

  8. #8
    DIY Junior Member 1db2's Avatar
    Join Date
    May 2013
    Location
    San Jose, CA
    Posts
    6

    Default

    Ok, I get it. So I can tee off the 2" side to run the lav and continue vertically for VTR. So the toilet would wet vent off the lav? Is the 2" vent off that fitting enough for all 3 fixtures for the VTR or would a shower vent need to be tied into that riser?

  9. #9
    DIY Junior Member 1db2's Avatar
    Join Date
    May 2013
    Location
    San Jose, CA
    Posts
    6

    Default

    I believe San Jose is UPC and am thinking I need a vent for the shower to tie into the VTR. I can also put a C/O there. How does this look? Have mercy on sparky. This is short circuiting my brain:

    Name:  Bath final.jpg
Views: 259
Size:  46.9 KB

    Thank you...Dominick
    Last edited by 1db2; 05-13-2013 at 08:22 PM.

Similar Threads

  1. Toilet Rough-in on Slab
    By austintx in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 3
    Last Post: 07-22-2009, 03:42 PM
  2. Adding a bathroom on a slab
    By Swag in forum Remodel Forum & Blog
    Replies: 2
    Last Post: 06-24-2008, 03:15 PM
  3. Rough in toilet before pouring slab
    By Team Scream in forum Toilet Forum discussions
    Replies: 9
    Last Post: 12-03-2007, 11:30 AM
  4. Laying pipe in the bathroom.
    By JohnyChevyEG in forum Plumbing Forum, Professional & DIY Advice, Tips & Tricks
    Replies: 11
    Last Post: 05-16-2006, 11:59 AM
  5. basement bathroom on slab
    By richd in forum Remodel Forum & Blog
    Replies: 3
    Last Post: 11-13-2005, 08:22 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •