I have a vent pipe that runs vertically through the house. I have a small house and the vent pipe runs from the main sewer line straight up to the roof. When it gets to the second floor it is visible and is in the way. It is also the only original piece of plumbing in the house circa 1944 and is made of steal. I want to reroute the pipe so that it runs along the roof to the crawl space then under the floor back to the oringal pipe. This would hide the pipe nicely and make the room more functional. My first question is will a couple of bends mess up the vent system? The second question is I have limited access to the bottom of the pipe and can't get a hand on it to place a rubber connection. Can PVC pipe be glued to a steal pipe, if so what type of glue should I use.

Thanks

Kevin

(1)My first question is will a couple of bends mess up the vent system? (2)The second question Can PVC pipe be glued to a steal pipe, if so what type of glue should I use.

(1) No, as long as the vent has free access to outside air and has the proper slope back to the drain you may have as many bends as you wish.
(2) No, You can't glue PVC to a metal pipe. Open up a No-Hub Coupling, (see image) and slip it around the joint and Then tighten the bands.
Good luck, Tom

Thanks for the previous answer. I am ready to begin my work and had a few people tell me to stop. They say that you can't have a 90 turn in a vent pipe. I don't see why I cant. Once again I am rerouting the pipe to run along the roof slope into a crawl space, under the floor to meet up with the original pipe. The turns that I would be making would be 1. 30 degree 2. 30 degree 3. 90 degree 4. 90 degree

Thanks
Kevin

" had a few people tell me to stop. They say that you can't have a 90 turn in a vent pipe."

And these people were licensed plumbers? I stand by my original post.
"As long as the vent has free access to outside air and has the proper slope back to the drain you may have as many bends as you wish."

They even make a short radius "vent ell",( see image) to go from vertical to horizontal and back again to vertical for just the type of off set that you propose. Regards, Tom

A straight 90 is legal for a vent but not practical. Some use the vent to run a sewer machine down and if the fittings are not smooth access the cable will get stuck.