Plumbing plan for Single family Residential with slab on grade.

[Remington]

Hi,

We have are designing a brand new single family residential with slab-on-grade foundations. The house will be two stories and both floors are slab-on-grade because the house is one a hill.

How are drain pipes installed in slab on grade foundations? For future maintenance requirements, incase there needs to be repair because of an earthquake, how can someone fix the pipes if they are imbedded below the concrete slab on grade?

 

[Remington]

Sorry, for typo (Correction)
We are designing a brand new single family residential with slab-on-grade foundations. The house will be two stories and both floors are slab-on-grade because the house is one a hill.

How are drain pipes installed in slab on grade foundations? For future maintenance requirements, incase there needs to be repair because of an earthquake, how can someone fix the pipes if they are imbedded below the concrete slab on grade? What is the best practice? For example, can the drain pipes on the second floor be routed to the attic on the first floor? This means only a portion of the pipes will be inside the concrete until it gets to the 1st floor attic.

 

[classicT]

If slab on grade, then yes, the plumbing is buried under the slab and is not readily accessible for modification or repair. Take photos when it is put in, as it will be much easier to find it later if needed.

And yes, you can run the upper floor drains in the floor/ceiling assembly, but that can create more noise and may be challenging depending on the depth of the floor system, type of joists and allowable penetrations, direction of joist span, and run/slope of the drain.

 

[bill1952]

Plusses and minuses to every building system. Modifying and repairing in and under slab utilities in a slab on ground foundation is a shortcoming. Careful layout and records, premium plumbing materials, as few joints as possible, and great installation are some of the measures that help mitigate it. Can everything but DWV for first floor be overhead, above a ceiling?

 

[ICE]

For example, can the drain pipes on the second floor be routed to the attic on the first floor? This means only a portion of the pipes will be inside the concrete until it gets to the 1st floor attic.

Cast iron is quieter than ABS. Make an effort to keep the pipe from contact with the framing and place insulation.

 

[Keystone]

An alternative to slab on grade construction, crawl space foundation. Minimal impact on cost, ability to repair or alter, can also place other utilizes such as water heater, interior portion of forced air hvac, etc....

 

[north star]

# ~ # ~ #

Remington, ...** classicT ** is correct about installing the drainage piping
below grade.........When installing the piping in an attic, you may also
want to consider, "will the piping be exposed to [ possible ] freezing \
below freezing temps." ?

$ ( ) $ ( ) $

 

[Remington]

If slab on grade, then yes, the plumbing is buried under the slab and is not readily accessible for modification or repair. Take photos when it is put in, as it will be much easier to find it later if needed.

And yes, you can run the upper floor drains in the floor/ceiling assembly, but that can create more noise and may be challenging depending on the depth of the floor system, type of joists and allowable penetrations, direction of joist span, and run/slope of the drain.

I'm trying to figure out what would be the better drain pipe layout if in the future the owners will need to fix the pipes.
Option 1 <-- link : Take drain pipes from the 2 bathrooms and laundry room to the exterior of the house individually to connect to the 4" drain pipe?
or
Option 2 <-- link: Connect the drain pipes from the 2 bathrooms to the laundry room drain pipe before connecting to the exterior 4" drain pipe?