Tie Into Existing PVC Drain Lines - Code Issues?

Syborg_97

I'm adding a bathroom in a bonus room above my garage, and I've got to tie into an existing PVC main drain line that runs around the perimeter of my basement.

It is a 3" main line, and having become sensitive to the plumbing codes, I've noticed that the existing lines use an abundance of sanitary tees laid "on their back" - pretty much everywhere that I would have thought a combo or wye should have been used (vertical line teeing into a horizontal drain).

Basically everywhere a drain comes from a upper story bathroom or where fixtures on the first floor tie into the main drain line, there is a sanitary tee.

The house was built 4 years ago, and obviously passed inspection to get a CO. So now that I'm going to modify the existing drain (to add my new drain line), do I have to worry about this?

-Simon

gregj

You should not worry about the existing but do any new work right.

rex

t's are for vents or stacks....use a wye with a 45 for horizontal runs...

x2 on what gregj said