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Spot the Plumbing Violation

They could put an AAV on the fixture drain (connected to the vertical through a wye) and it would comply with the IPC.
 
One wonders way they just didn't use a double san tee....A lot of extra work. (but maybe that's what was left on the truck?)
 
# # = # #

The lavatory drain on the left appears to have
very minimal slope, or even negative slope.
Maybe it is just the angle of the picture though !


# # = # #
 
Is there a state or municipality that does not allow double sanitary tees or is it an inspectors lack of understanding?

It may have been a rule of thumb at some point, but mainly uninformed or over-employed inspectors.

Some people read the footnote and run with it.....


. For a limitation on double sanitary tees, see Section 706.3.
 
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