I have a detached garage that serves as my woodworking shop. My latest
project involves installing thermal solar collectors on the shop roof and
piping the hot water back to the house provide heat for the domestic water
Part of this project will involve a 40' trench from the shop to the house
for the solar heating pipes - hot supply and cold return. Currently the
shop does not have any plumbing. I was thinking that while I've got the
trench open I could run a water line from the house to the shop and and a
sewer line for a utility sink.
Altogether the trench would have:
2 insulated pipes for the solar heating system
1 cold water line to the shop from the house
1 sewer line from the shop to the house
I should add that the floor of the shop is slightly above grade and the
pipes will be run to the house basement, the floor of which is about 5 or 6
feet below grade. I only want to install one utility sink in the shop; no
1) Is this shared trench a massive code violation in the US? (located in
2) What is the smallest sewer/drain line that can be installed in such a
scenario? I have an ideal location to tie into the house's sewer via a 3"
3) IIRC the drop for a sewer line should be 1/4" per foot - is this about
Thanks for any help you can provide!