plumbing and pressurized water lines in a slab foundation

[bmurphy96]

Plumbing is an area where I have little experience. I am building a small cottage that originally started as a workshop. Because of its original purpose I didn't plan for water needs and poured a 4" slab with no piping in place. Now, because of the change in plans for the building, I am extending the foundation 12 feet. This area, which has not been poured, will contain the bathroom area. So we can plan and place water needs appropriately for the bathroom.. However, we do have to put the kitchen in the area where the slab has already been poured.

So a few questions.

1) what should I plan for the bathroom area? I know I need a pipe going through the foundation to the septic tank. This would have be located where the toilet will be going straight down through the foundation and then slope out towards the septic tank. How will the sink and shower tie into this? Or is it separate? should the water coming in (from a well) go under this new foundation or through the wall? The current plan is for the water heater will be located in the bathroom as well so it will tie into this.

2) what about for the kitchen area? Part of it  will be placed on the back wall which is the area that will be extended. Some of it will extend on a wall that runs 90 degrees from that back wall.  So the kitchen area can share a wet wall for some of this. It looks like the sink will be on the side wall though. Is it safe to assume I can run pex pipe along that wall and run a drain pipe from the sink down the wall (at an angle I would assume)  towards the back (and new foundation)? I hope that makes sense.

thanks!!

Keith

[Redoverfarm]

Plumbing is an area where I have little experience. I am building a small cottage that originally started as a workshop. Because of its original purpose I didn't plan for water needs and poured a 4" slab with no piping in place. Now, because of the change in plans for the building, I am extending the foundation 12 feet. This area, which has not been poured, will contain the bathroom area. So we can plan and place water needs appropriately for the bathroom.. However, we do have to put the kitchen in the area where the slab has already been poured.

So a few questions.

1) what should I plan for the bathroom area? I know I need a pipe going through the foundation to the septic tank. This would have be located where the toilet will be going straight down through the foundation and then slope out towards the septic tank. How will the sink and shower tie into this? Or is it separate? should the water coming in (from a well) go under this new foundation or through the wall? The current plan is for the water heater will be located in the bathroom as well so it will tie into this.

At lot of that depends.  Are you in an area that will freeze?  You can feed the sink and shower drain into the same line as the toilet.  You will need to trap those lines to avoid sewer gas.  The toilet has it's own trap made into it.  The traps can be above your slab or box out for them to set in the slab remembering that you may have to clear clogs from the traps.  As far as the water supply you will need a pressure tank to pressure water from the well to the house as well as a small bit of storage to keep the pump from running every time you call for water.

2) what about for the kitchen area? Part of it  will be placed on the back wall which is the area that will be extended. Some of it will extend on a wall that runs 90 degrees from that back wall.  So the kitchen area can share a wet wall for some of this. It looks like the sink will be on the side wall though. Is it safe to assume I can run pex pipe along that wall and run a drain pipe from the sink down the wall (at an angle I would assume)  towards the back (and new foundation)? I hope that makes sense.

If you cannot get everything on one wall opposite of each other yes you can drain and supply on a side wall by drilling the studs so that you get 1/4" @ foot fall.  The supply is not that critical in that it doesn't require a fall or slope to operate.  You can also run a drain down through the new slab for it as well and tie it into the shower, sink and toilet with T's, Y's or what ever it takes to make your configuration.  For the supply from the well you will only need a cold water line.  Once you hook into the Hot water heater you will gain your hot.  You can come off your cold water supply after the pressure tank for all other appliances.

I probably have overlooked something that is common for those have "been there and done that" so to speak so if you have a question feel free.



thanks!!

Keith

[rick91351]

I am pretty sure with the addition with a little figuring as Redoverfarm points to you can make it work. If you can't little alternative to breaking or sawing.  Here there are several companies that saw concrete.  I hired such done on a older ranch style basement with small windows I had them cut out to egress size.  What a great thing that was.