Bathroom sinks, like all devices that produce waste water, need vents connected to your sewer lines trough sink bathroom. A roof shield applied on the tube then holds the tube in place, and water leaks around the vent pipe stops. Marcos drainpipe from the sink in the place where the vent pipe needs to be attached with a pen. Cut trough sink bathroom the pipe at the mark using a hacksaw.
Tighten the coupling between cuts, and move coupling supplier so that it faces. Keep the coupling in place for 30 seconds while the glue dries. Paste the inside of the pipe coupling. Also glue one end of a new piece of vent pipe. Check all upper and lower plates where the vent pipe must travel through to reach the roof.
Also check the inside of the roof where the pipe will go through. Drill holes 2 inch diameter plate’s marks. Paste and connect the vent pipe and new links, as needed, to run trough sink bathroom the cavity wall into and through the holes drilled in the plates. Place a shield roof over the end of the vent pipe, and press down so that it rests on the roof.