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How-to do Plumbing in my ICF Walls

May 17, 2011

Written by: Colin Showalter

A frequently asked question I get is, “How do I do my plumbing in my Advantage ICF walls?”

The Advantage ICF system is typically used for construction of exterior walls of a building. Plumbing is rarely placed in exterior walls. However in the event that there is plumbing required to be in your exterior wall or Advantage ICF is used as a party wall or interior wall here is what you can do.

This shows the 2-5/8" EPS foam cut back to hide a 2-1/2” pipe.

Since the EPS foam on the inside of the wall is 2-5/8” thick you can cut the foam back to the concrete using a electric chainsaw, hot knife or router. This will allow you to easily hide a 2-1/2” pipe in the wall and still run the drywall flush over it. You may want to fill in around the pipe with a low expansion foam. I would also recommend covering or protecting the pipe with metal strips or sheets to protect it from fastener penetration.

In the event that the pipe you are required to use is larger that 2-1/2” you will have to frame around the pipe with lumber. This is still easily done. Obviously it is easiest if you can avoid putting any plumbing in an ICF wall during the design stage.

Note: All plumbing work is to be done by a licensed plumber.

Following these simple steps will allow plumbing work to be done in your Advantage ICF walls easier than ever.

Next: How-to attach interior and exterior finishes to your ICF walls

4 Comments leave one →
  1. Anonymous permalink
    January 14, 2015 4:18 pm

    well , i think lots of plumbing is put in exterior walls.
    This would be drains and some stack vents. The sanitary drains would be nominal 3″ ABS
    that are actuall about 3.5″ outside diameter, that change to a 4″ just above the basement floor

    • Anonymous permalink
      March 3, 2015 4:08 pm

      any answer on that question above about 3/4″ abs

    • July 15, 2015 3:02 pm

      If it is more than 2 1/2 ‎inch pipe build a bulk head around pipe. Hope that helps.

  2. Anonymous permalink
    March 3, 2015 4:11 pm

    sorry I forget, no I do not want to frame around it, duh , of course I know that, the advantage of icf for a basement is that its already framed and insulated, ready for drywall(after a some electrical outlets are put in). But now your telling me I should frame the whole basement with studs to cover up plumbing drops, which there are quite a few in a modern home with say 4 or more washrooms.

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