Through-Wall Pipe Forms
Running pipe or conduit through a poured concrete foundation wall with no gaps to patch and without cutting holes in the forms sounds too good to be true until you’ve tried this trick. Cut a piece of the pipe you need and attach couplings to both ends so that the total length of pipe plus couplings exactly matches the thickness of your wall, as shown in the drawing.
This unit will then fit snugly between the forms, and can be wired to the rebar and spreaders at the top of the forms to keep it in place during the pour. When the forms are pulled away, you have a coupling embedded on each side, flush with the wall and ready for another length of pipe.
D. A. Fleury, Curlew, WA
Edited and Illustrated by Charles Miller
From Fine Homebuilding #27
This is not a method that would work in Southern California. We find it smart to wrap and cushion any pipes penetrating the concrete so they are less likely to snap during a "seismic moment." A little modification of the author's method would probably work here where every day is Earthquake Appreciation Day.