My house was built in 1928 and when remodeling the bathroom I found no vent pipe for the sink or tub. The toilet is vented. My question is... can I run PVC off the drain line and tie into the Toilet vent pipe about 5 feet away from the sink, or should you have a seperate vent at the sink and tub. Not looking forward to punching a new hole in the roof. - Thanks for any advice.
Yes you can tie into the main vent. Besure you are at least 42" above floor level to be within code. 5' is at the extreme, but that's to comply with the plumbing code. Air is air in venting. The way the code works is on a point system. The commode being 6, the tub being 1 1/2, and the basin being 1. If you have the original cast iron still there it is most likely 4" in diameter which is more than enough. You can use a double sanitary tee, upside down, in PVC and two No-hub couplings to install the fitting. The installation norm is fixture, to vent, to drain. I wish I could draw a picture.
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