Qwerty5566
New Member
Looking for opinions on a venting issue. Please see the diagram attached. This is a 4 story 2 over 2 condo building in Chicago.
The issue is when it rains heavily the toilet on the 2nd floor (labeled 1st floor on the drawing) will violently discharge air causing water to splash all over the floor. After the few minutes the air seems to escape or equalize and the toilet stops splashing but the initial volume of air is impressive, beyond light splashing. No other fixtures seem to be effected. There are many other units with this same setup and they all report similar issues.
My belief is that the flat roof is draining into the main stack, filling with water and pushing a column of air down that gets trapped where the stack jogs horizontally.
Does this seem like a logical explanation and what are some possible solutions? There is one other stack in the building that I might be able to tie a vent into or maybe adding a vent where the stack initially runs horizontal would help?
Thanks for any thoughts or ideas on this issue.
The issue is when it rains heavily the toilet on the 2nd floor (labeled 1st floor on the drawing) will violently discharge air causing water to splash all over the floor. After the few minutes the air seems to escape or equalize and the toilet stops splashing but the initial volume of air is impressive, beyond light splashing. No other fixtures seem to be effected. There are many other units with this same setup and they all report similar issues.
My belief is that the flat roof is draining into the main stack, filling with water and pushing a column of air down that gets trapped where the stack jogs horizontally.
Does this seem like a logical explanation and what are some possible solutions? There is one other stack in the building that I might be able to tie a vent into or maybe adding a vent where the stack initially runs horizontal would help?
Thanks for any thoughts or ideas on this issue.
