The next day we rented a diamond tipped core drill and drilled two entry holes in the house foundation. The drill did a very nice job, and we were done with both holes in about an hour. Fortunately our local rental store rented the unit at a 4 hour rate, so we could save a little.
We bored 2 - 2.5" diameter holes. One for supply, one for return. The extra area between the PEX and the foundation will be filled later with insulation.
The core drill was worth every penny to get the job done quickly. Our foundation is p
oured, and 12" thick. The only difficulty I had was getting the hole started, and keeping the hole on a level plane. If keep the hole level was important, you can rent a drill that mounts to the wall. Of course for a higher fee! Since we a filling the hole with water tight spray foam insulation, level was not a big issue.
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