It's 3" ABS so it does not weigh that much. However, does no one make a
support system that installs within the wall (as opposed to supporting it
from below)?

I know that I can wrap it with 'plumbers tape' and nail the tape ends to my
studs. Easy to do where you can get a bite because of a fitting. How about
mid-length? It would be easy if they made a 'glue-on' (ABS) quarter circle
with floppy straps that could be nailed to the studs.

Checked with both box stores and ACE. Nobody knows of a better way to
support stack than to simply wrap it tightly with the metal plumbers tape.

Any other ideas? Thanks god it isn't cast iron.

Thanks,
Ivan Vegvary