Bathroom venting questions
I am getting ready to redo my main bath, but have a few questions about venting. I am new to the forum so please bear with me if pictures don't attach, or other such problems occur.
First of all, I live on a small acreage in southwest Manitoba and have a well and septic tank and septic field. I moved from the city a year ago and am unsure of all the ins and outs of rural plumbing.
The bathtub is located roughly 5' from the main stack, but it has a vent connected to it roughly 16" from the drain/P-trap. The vent does not go through the roof, only into the attic. Is it the vent required since the distance to the main stack is further, and should I increase the diameter of the drain/vent (I have to move the plumbing anyway, wider tub)?
There is another pipe that (once was, it's cracked now) connected to the main stack, approximately 4' above the floor, that just goes through the concrete in the basement floor. There is a Y that has a cap on it, not a clean out or anything. Is this a vent for the holding tank, before the sewage is pumped into the septic tank? Or was it meant for venting a basement bathroom (basement is unfinished, but plumbing was somewhat roughed in - but that's another post).
Hopefully this makes since and the images loaded so you can see what I'm talking about.