We've recently moved into an old house. We changed part of the soil pipe in the basement, which actually makes the flow more straight-forward/unobstructed. I've marked this in the attached diagram.
Since when, we've noticed when someone flushes toilet on first floor, it sucks the water out of the traps/u-bends on the top floor. And then the top floor smells like a sewer. Presumably the gases have been released.
I figured we need to add a plumbing vent. Basically attach a pipe to the top of the soil pipe, on top floor, and run it through the roof. I've marked proposal in attached diagram.
I just wanted to check if i'm on the right track?
I haven't opened up the wall to get at the soil pipe yet, so i'm not sure what's waiting for me. Plus, I'm a little worried about the roof work. I suppose there's no way to do the work entirely from the inside?
I don't have any scaffolding, and i'm certainly not confident enough to go out on the roof without it. Even then, I think i'll have to hire someone to do this.
Thanks for any advice. James