Avoid a Code violation Tee's & Combo's

[LazyPup]

One of the most often noted code violatons is the improper placement of Sanitary Tee's, Wye & 1/8 Bends and Combo's.

A sanitary Tee may not be installed on its back with the side opening in a vertical position. The reason is that the waste will hit the bottom of the horizontal pipe and splash back upstream in the horizontal pipe. This can lead to solids being deposited on the upstream side that would cause a clog in the line. When connecting a vertical drop to a horizontal run you must use either a Wye & 1/8 bend (45 deg), or a Sanitary combo, (A combo is a combination Wye & 1/8 bend ready made in one fitting). The purpose is to form a long radius bend to insure the waste is directed in the downstream direction as it enters the horizontal run.

When connecting a horizontal run, such as a waste arm to a vent stack or vertical riser, you must use a SANITARY TEE. The use of a Combo in this position would put the vent stack inlet well below the horizontal pipe and causes a restriction that prevents vent air from getting into the horizontal line.

[mrcaptainbob]

How timely your info! My son broached the subject of adding an upstairs lavatory and I brought up this forum and it's info. He'll be getting many printouts this week! Thanks for your help!

[kactuskid]

Lots of great info and the pictures really help with the explanation. Thanks

[hookerp]

What if the tee is on it's side, in this type of setup?

Looks like a tee or two to change!!!

Thanks

[LazyPup]