Hey all,

I am installing a new bathroom on a second floor of my house. I need to pass a 4" PVC pipe through the foundation (or wall, depending on what I hear from you) to tie into the existing outside waste line. I had planned on tying in to the interior line, only to discover some real issues with that plan.

The house is on slab, but I have an area in a utility room (luckily right below the new bathroom) that left the dirt exposed along the foundation, where I can pass through.

The questions:

1. Is it better to pass through the exterior siding-above-grade, foundation-above-grade or foundation-below-grade? I was avoiding above grade due to cosmetics and freeze issues and the likelihood that it is against code.

2. If drilling through the foundation, do I maintain slope or is there some reason to change the angle... level or 45 deg. or some other sneaky tidbit in the code?

3. If going through foundation above or below grade, am I required to install a 6" sleeve and how do I backfill/seal it?

4. Any need to flexible boots, as this house is 50+ years old and not likely to settle.

5. Any other pitfalls I should watch for?

Thanks for your help!