Owner Builder: Underslab Plumbing

We compare two different examples of underslab plumbing and address the pros and cons of each.

Category:

Howto & Style

Tags:

• owner
• builder
• underslab
• plumbing
• construction
• building
• process
• ownerbuilderonline
• build
• your
• own
• home

[thelineofmypeople]

Thanks for sharing. Whats the alternative to putting lines under the slab?

[arossona]

If you watch the building process video series you will see on that project, while the waste lines are run underslab, the water main is run to edge of the foundation and up into an exterior wall. from there the water lines are run throughout the structure in the floor trusses above the first floor.

Another option is running all lined (water and waste) in a raised foundation or crawlspace.

[kjcorn]

good info but i had to quit watching because the camera was moving so much it made me sick!

[arossona]

You are absolutely right. I am working on shooting my newer videos with less movement. I also saw your comment on the other video. Thanks for watching. I will be focusing on better video work moving ahead.

[laybackbarrel]

Dude! at 3:45 you tilt down to to expose two WYE fittings aimed toward each other. ( ie 90 degree Tee Wye's) This is wrong. And a code violation Rule one: ^%# flows downhill. Rule two: Payday is Friday.

[arossona]

good eye.( for those that don't know exactly what laybackbarrel is referring to- there is a point in the video where I scan past some vertical waste lines, two of them run right into each other. They should all enter the main line flowing in the same direction...downhill) I would imagine (I HOPE)the city inspector caught it as well.

[manuelito489]

that kind ot insulation is a big nono for pex

[2020starman]

to all you servce plumbers .... .. nothing could be dumber than being service plumber !! ...lol 

[2020starman]

@wallydog49 sleeving is not required by code ... instalation facter ... on hot .good idea .. altough the abs and water lines are required to be wrapped prior to slab pour .. can be looked at by inspector at prepour inspection

[wallydog49]

Did the Specs say to sleeve the water lines? If not I want a change order pronto!

[laybackbarrel]

@laybackbarrel That's the way i prefer to vent (Santee) But every once in awhile to meet vent distance requirements the lay out calls for the (vent) Wye at 45 degrees +, in which case a reverse snake would most likely find it's way up the toilet.

[laybackbarrel]

@Mindstay Exactly, the drainline goes directly to the toilet, the Santee vents vertical. Nice work.

[Mindstay]

@laybackbarrel 1. A drain line can go to the w/c by using a sani-tee installed (vertically) with the closet ell (for the w/c) going into the tee. 2. Please read U.P.C. code 707.4 exception #4. 3. You would use the top side of the sani-tee to run the vtr (vent through roof) line. The tub/shower or lav. vents can be re-vented to the main vent stack for the w/c. Hope these answers helped. My "ignorance" is in your eyes, where others respect my knowledge as valid. Happy Plumbing!

[Mindstay]

@laybackbarrel Thank you for the "Handyman" remark. I still have yet to come up through a vertical sani-tee through the closet ell and up the flange. Looking forward to it though. LOL Yes I know that you can plumb the w/c into a combo. or a wye with a 45 then continue the vent @ the upper flow. The later may be best if you've got back-to-back w/c. You do it how you like. We are both right.

[Mindstay]

@laybackbarrel No you don't have to, but per [U.P.C. 707.4 exception #4] "An approved type of two-way c/o installed in the bldg. wall near the connection between bldg. drain & bldg. sewer or outside of bldg. @ the lower end of bldg. drain & extended to grade may be substituted for an upper terminal c/o." You are right, "everyone has their way of doing things". So I am ignorant for doing it per the way I mentioned. I am a service plumber and my customers rather C/Os in the yard than open a wall.