Capping off Cast Iron Stack Bosses to Prevent Backing up and Flooding All aspects of plumbing questions and answers, help, tips and information

[birdman]

Hi All,
Living as I do the ground floor flat of a tenement I am constantly getting flooded out with waste water backing up into both the kitchen sink and wash hand basin in the toilet which are plumbed into a cast iron waste stack that also takes waste water, I woulld like to cap off the two bosses on this stack within my property after re routing waste pipes from washhand basin in toilet to the bath waste (which in turn is plumbed into its own seperate waste pipe) and the kitchen sink out through the wall to externally connect into the cast waste which only takes the bath waste from my flat.

Can it be done and what do I require to cap of these two bosses?

appreciate the replies guys.

[thedoctor]

Hi. As long as you have a viable alternative to getting the waste water out the pipes can be capped off by cutting them off about 2 inches from the stack and fitting a solvent weld access pipe fitting. This has a screwed end which will remain watertight but still allow access to the trap for some "poking about" if a blockage occurs. Hope this helps, please do let us know how you get on.