IPC section 913 Waste stack vent question

[Giblets]

So it says the that the waste stack can not be offset between the lower and upper most fixtures and must remain vertical. My question is does this also apples to 46 degree offsets? Typically in IPC a 45 degree from vertical offset is still considered vertical as far as the system is concerned, say when running dry vents to get above flood plane, but I wondered if water stack venting has different rules in place. Any help is much appreciated

 

[Jeff H Young]

Typically 45 degrees is the cut off between vertically and Horizontal in my world as well.

 

[Sponsor]

 

[wwhitney]

IPC 913 is not a section I'm particularly familiar with, but 913.2 says:

"The waste stack shall be vertical, and both horizontal and vertical offsets shall be prohibited . . ."

I reckon the prohibition on both horizontal and vertical offsets covers all possible types of offset. The waste stack (between the top and bottom fixtures) would need to be a straight line.

[Of course, that doesn't say that it has to be plumb, a straight stack that's 0-45 degrees off plumb would still satisfy the language and definitions. But significantly off plumb would be weird.]

Chapter 9 Vents: Vents, Missouri Modular Plumbing Code 2015 | UpCodes

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Cheers, Wayne