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[skorpyd]

I've been posting about my build, but I have a question that's been on my mind about actually bringing the plumbing into the house.  I searched and couldn't bring up anything of value.

I don't rally want to go through the block wall of my basement, especially below grade.   My thoughts are to bring the insulated pex line up from the trench to rim joist level then put a pex 90 on each line and drill through rim joist. 

I would then plan on building a box, probably out of pressure treated 2x12, to cover the exposed plumbing.  I would insulate with fiberglass around the connection area where it goes into house.

Are there possibly any better ways of doing this?

[BoilerHouse]

I think going though the foundation wall is likely the most common.  If it is a block wall, then a series of holes in the area of the web with a larger masonary bit, then carefully hammer out the center.  I live in an old farmhouse and borrowed from work a water cooled  diamond core boring drill with a 6 inch bit.  These can also be rented.  Anyways, it went through 12+ inches of poured/stone foundation in 20 minutes.
That being said, I don't see any drawbacks with the solution you proposed.  A little added resistance from the elbows but no big deal.

[victor6deep]

I went thru the block wall and we used a 2 inch hilti bit several times to take a half block out. On the exterior hole I framed it in and filled with hydraulic cement also left the trench by the house open til next year so the cement collects lots of moisture to heal. I them thin cemented the interior and foamed on top of that.

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[Scott7m]

Going through the wall is the neatest and easiest, however you can do wha your talking about as long as you build a little house around the exposed parts