Hi,

I have a cast iron soil stack that is cracked badly a length of about
5 feet. The crack goes from the top of one section to the bottom of
that section. The other sections seem fine above and below.

I would like to replace with PVC. It is a straight shot from the
basement up through the first floor and to the second story bathroom.
Ther are no other conections on first floor or basement.

The problem is BELOW where the toilet / bathtub / and bathroom sink
meet at the stack, so I just have to replace a strait length of pipe
down to the basement.

1. How do I loosen the conncetions between two pieces of cast iron so
I can take out this damaged section and the 2 sections below it. Heat
the lead and Oakum and twist the sections apart?? Will that get the
pipe sections seperated? How is it best done?

2. How do I reconnect PVC to this cast iron piece.

3. Do I need to support it from above? Can I grab ahold of the vent on
the roof with a clamp and thus support the stack above the cut?

Click here for pictures: http://www.flickr.com/photos/31219867@N00/

Any other advice!?? Thanks guys!!!

On Jun 3, 8:47 pm, slindsey3000 wrote:
I have a cast iron soil stack that is cracked badly a length of about...
Any other advice!?? Thanks guys!!!

Looks like you have full access to the entire cracked length of the
pipe. Can you check with a plumber about some epoxy weld? Because the
stack is not under pressure, so a decent weld or that old-style lead
thing could save you from having to open the mess and putting a new
pipe through floors.

Seriously consider replacing with cast iron NOT PVC. The pipe appears
to be in a living area wall. PVC is much noisier than cast iron (ci
absorbs noise).

The simpliest way is to get a soil pipe cutter and cut above and below
the damaged pipe , removing both the hubs. Then use compression type
collars to attach both pieces with a new length of cast iron. You
must also support the stack directly above the cut with one or more
stack clamps. Lead and oakum joints cannot carry a downward force so
you can't let the stack hang from the roof!

This is a job that a plumber with the right tools can do reasonably
quickly.


On Jun 3, 9:53 pm, Nexus7 wrote:
On Jun 3, 8:47 pm, slindsey3000 wrote:

I have a cast iron soil stack that is cracked badly a length of about...
Any other advice!?? Thanks guys!!!

Looks like you have full access to the entire cracked length of the
pipe. Can you check with a plumber about some epoxy weld? Because the
stack is not under pressure, so a decent weld or that old-style lead
thing could save you from having to open the mess and putting a new
pipe through floors.