Flot

This is probably a dumb question but (wastewater) plumbing really isn't my thing. :-)

South Florida, CBS single story contstruction, everything run through slab.

What I'm looking at is a house where the layout isn't quite right. The kitchen and laundry room are where the master bath should be, and the den would make a killer walkthrough kitchen. Looking at the layout I can easily come up with ways to get the supply lines through the walls etc to where I'd want them. (all these existing rooms are next to each other)

Now I know I can relocate a laundry room without much trouble, done that before, since the washer drain line isn't a big deal. I presume a kitchen sink can also be moved a long way from its starting point, since it too terminates 2' above the ground. BUT I admit I am confused about toilets and showers.

Can I "easily" convert what was once a kitchen sink drain to a shower or toilet drain?

Can I really put the new kitchen sink a few feet away from where it started, without tearing up the slab? Or should I not be afraid to cut the slab?

I guess I'm a little concerned about all these "drain" connections being a bit farther away yet still terminated in the original place - but I guess that's how most hoses are/were constructed anyway, right?

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cojimero

IMPO the answer is not. The toilet drainage is normally bigger than a sink drainage and connected to the main house discharge directed to the outside cleanout, but much depends on the building year of your residence, new one have new codes and normally bigger diameter pipes discharge.
Note: Im not a plumber, only a GC.

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"Practice makes perfect. But nobody's perfect. So, why practice?"

starrfish

toilet require 3 inch drain, the biggest sink drains are usually only 2 inch, more common is 1 1/2 inch.. so to make a sink waste into a toilet waste is a big project..

daddy0

Stop and listen to what your saying, no you can't do that just because the pipe reaches there are codes to be adhered to.They have been implemented for the protection of your own health and safety. You obviously have no clue of even the basics. Pitch flo and venting are not sales jargon.
The following will guide you to what may be possible with skilled craftsmen

Simple rule of plumbing (hot water on the left $hit runs downhill) First establish where your sewer exits the building , this can by locating the cleanouts. Should your intention be to shift the toilet and shower closer to point of exit, this is possible,if your desire is to move the toilet further into the building,depending on other factors,this may also be possible but certainly more difficult.
It is impossible to do anything mentioned without opening the concrete floor.and wall
If you relocate a toilet the code specifies a max. distance from the vent stack .For that you must also open a wall and pierce the roof (another thing you had no clue of)
This also hold true for those sinks you thought were a cinch to move .

daddy0

Sorry double post

Flot

Guys, sorry, let's start this over and assume I'm not a moron. I did not mean to imply that I thought I could simply run ten feet of PVC under the carpet and call it a drain. Obviously I should stop posting while on medication.

I should have said "can I do these things with minimal damage to the slab (IE cutting a square foot around where a drain must be connected, but not necessarily cutting a 7' x 3' section of concrete out)

I didn't mention venting, because there are 2 (?) vent stacks in the current setup and my understanding is that horizontal runs through a wall to a vent stack can be on the order of 4+ feet? (I understand that I'd need to be joining vent connections high in the wall)

The walls are fair game for destruction.

So let me try again:

How far (ballpark) could a kitchen sink be located from the original drain in the slab while staying within code and maintaining acceptable pitch? Are we talking about 3 inches or 3 feet?

I do realize I can't just stick a toilet over a 2" sink drain - I was more wondering if there's any hope of not tearing up the whole main sewage line to put a toilet where a sink drain was. How about the reverse toilet lines have no traps - so can I drain a (properly trapped and vented) sink to one?

You did lose me on this, although this is where I get uncertain about sewage plumbing - why is it more difficult to move a toilet/shower further into the building than further out?

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billinstuart

You can't have a shower connection downstream from the toilet..it has to be above the toilet connection. As Daddyo pointed out, you may not have enough fall to extend anything further from the soil line.

Venting is a non-issue, with the development of "Studer" or autovents...that's the only good news. Otherwise, without knowing exactly whats under the slab you're just guessing. The first step is usually to pull the toilet and see how deep the drain line is.

The sink shouldn't be a problem. They usually drain into a stack in the wall. Simply open the wall, lower the connection, run laterally to the sink, and autovent it.

Flot

Ok, this is where I get confused - how is that avoided in intial layout? If you have a 3 bath house with only one connection to city sewer - isn't there always a toilet "above" something else?

Whoa what the heck is this thing? Are these really to code? Can you build a house with zero roof vents then?

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billinstuart

Toilet relationship is on each leg that goes to the main soil line. The plumber lays out the drain lines so they connect in the correct sequence under the slab.

An autovent is a one way vent..lets air in, but no fumes out. Perfectly legal. you only need one VTR (vent thru roof) which has to be straight to the drain line. Anything more detailed yer gonna haveta talk to a real plumber..I'm a building contractor.

tommyr904

in Fla you only need one 2'' stack out the roof.everything else may have a air admittance valve or studer vent.kitchen waste should be on a 2'' line but somewhere it will run into a 3'' line depending on bathroom location's will determine where the 3'' line is.if your trying to add a bathroom the easy way is to put a step tank on the exterior wall next to the room and pump the waste to the main sewer .without looking at the house I really can't help you much.but within code you can run a waste pipe 6 feet from a stack.