J.A. Michel wrote:
I'm planning on running a new sewer line myself. Is 4" schedule 40
sufficient for sewer line when it's buried to a depth of 10-12ft? What
about coupling the pieces of pipe together? Are glued couplers sufficient,
or should the joints have rubber sleeves over them in addition to glued
couplers?

TIA,


The question can not be answered.

If you will be tying into a municipal sewer system,
their regs will rule.

They may ask for:
Specific soil prep/support.
Slope requirement.
Pipe larger than 4".
Pipe material.
Glued vs. O-ring joints (typical for sewer work).
Location of Test Tees.
Testing procedure.
Backfill.
Authority for final tap-in.

Do the homework with the town/county/whoever.

Jim