I am in the process of remodeling my bathroom. I am moving all fixtures, toilet, sinks, shower, and jaccuzi. It is on a concrete slab, which I have mostly tore up. I am looking for some help with vents and drains for my new project. I attached a PDF with my proposed fixture layout. I understand that the drain should drop 1/4" per foot. Because of the height of my main drain (It is buried in a footing, so I cannot shorten it), the top of my 3" ABS pipe to my toilet will be running in the concrete slab about 1/2 way, not under it. Is this going to cause a problem, or should I use less slope?


Any help is appreciated...

I am in the process of remodeling my bathroom. I am moving all fixtures, toliet, sinks, shower, and jaccuzi. It is on a concrete slab, which I have mostly tore up. I am looking for some help with vents and drains for my new project. I attached a PDF with my proposed fixture layout. I understand that the drain should drop 1/4" per foot. Because of the height of my main drain (It is buried in a footing, so I cannot shorten it), the top of my 3" ABS pipe to my toilet will be running in the concrete slab about 1/2 way, not under it. Is this going to cause a problem, or should I use less slope?


Any help is appreciated...


If height is a problem you may reduce the fall to 1/8" per foot. That's just cracking the bubble on your level. The PDF you sent just gives me the fixture placement. What i need is for you to lay out the drainage and then I can correct it to conform to the Universal Plumbing Code. (Hint:) You'll run a 2" vent off the lavatory and wet vent the shower and whirlpool through the lavatory drain. Good luck, Tom

Have a look at my new diagram. I did more work and found the main 3" ABS drain coming into the bathroom about 12" under the slab. This will make my work easier and allow the full 1/4" per foot slope. I indicated the direction flow by red arrow.

I indicated vents in blue, 3" ABS in red, and 2" ABS in black. I will have a P-Trap at the tub and shower. The tub will go from 2" to 1 1/2" at the P.

Thanks for your help.

Have a look at my new diagram. I did more work and found the main 3" ABS drain coming into the bathroom about 12" under the slab. This will make my work easier and allow the full 1/4" per foot slope. I indicated the direction flow by red arrow.

I indicated vents in blue, 3" ABS in red, and 2" ABS in black. I will have a P-Trap at the tub and shower. The tub will go from 2" to 1 1/2" at the P.

Thanks for your help.

Your ducks appear to be all in a row. Thanks for drawing to scale,( 3/8") so I could check the measurements. The lavatory and shower vents fall inside code and the whirlpool will wet vent through the shower vent. Hey! Looks good to me. Tom

I don't know if you can tell from the diagram, my toilet will wet vent through the basin. Is this acceptable, or do I need a vent dedicated for the toilet?

In addition, when I get ready to burry my pipes under the slab, do I need to make sure the dirt is fully covererd with the 3/4" gravel, or can the dirt and gravel be mixed together? During the 'uncovering' of the pipes, the gravel is currently mixed together with dirt. I want to make sure I can cover things back up with this mixture.

Thanks!

I don't know if you can tell from the diagram, my toilet will wet vent through the basin. Is this acceptable, or do I need a vent dedicated for the toliet?

In addition, when I get ready to burry my pipes under the slab, do I need to make sure the dirt is fully covererd with the 3/4" gravel, or can the dirt and gravel be mixed together? During the 'uncovering' of the pipes, the gravel is currently mixed together with dirt. I want to make sure I can cover things back up with this mixture.

Thanks!!


Your toilet will indeed be wet vented through the lavatory. No further venting should be necessary. Just cover the drainage with the gravel and soil. Then lay visqueen over the opening and pour your patch. Good luck, Tom

Again Thanks for your help. I'm finishing up with laying the drain and ready to begin water supply lines. Is there any restrictions with splicing copper under slab and/or what needs to be ran?

Again Thanks for your help. I'm finishing up with laying the drain and ready to begin water supply lines. Is there any restrictions with splicing copper under slab and/or what needs to be ran?

Code doesn't allow us to make under slab solder joints. Too many chances for a leak with no way to get at and repair it. We run our lines with soft copper and loop up in the wall with supplies. We then loop back down under the slab to the next fixture. This way there are no underslab joints. I guess if you're not going to be inspected you could solder in a branch but it's not the smartest way to go. Good luck, Tom