How to seal new plastic soil stack to old cast iron stack
 

having installed a gf wc, I'm fitting a new plastic soil stack.
The old cast iron stack terminates about 2 foot below ground level, so
rather than do it proproperly, and dig out, which could be one hell of
a job, i've decided to leave a stub of 6" cast iron pipe protruding
above gl. and join the plastic pipe to it.

The plastic sleeve is slightly larger diameter, and-fits snugly over
the outside of the cast-iron, There is a 1mm gap to make watertight.
Since the cast iron from below ground terminates on the inside, there
is a lip, which is liable to catch any falling waste.

What is the best way to seal this junction which won't be accessible
again for 50 years , and taper out the lip? What sticks to plastic?
Thoughts:
Putty mixed with gloss paint; Silicone sealant; grease; Plastic
solvent glue, soft rubber fitting with circlips, other?

Brill group!

Thanks,
Tony

How to seal new plastic soil stack to old cast iron stack
 

"tonyjeffs" wrote in message
...
having installed a gf wc, I'm fitting a new plastic soil stack.
The old cast iron stack terminates about 2 foot below ground level, so
rather than do it proproperly, and dig out, which could be one hell of
a job, i've decided to leave a stub of 6" cast iron pipe protruding
above gl. and join the plastic pipe to it.

The plastic sleeve is slightly larger diameter, and-fits snugly over
the outside of the cast-iron, There is a 1mm gap to make watertight.
Since the cast iron from below ground terminates on the inside, there
is a lip, which is liable to catch any falling waste.

What is the best way to seal this junction which won't be accessible
again for 50 years , and taper out the lip? What sticks to plastic?
Thoughts:
Putty mixed with gloss paint; Silicone sealant; grease; Plastic
solvent glue, soft rubber fitting with circlips, other?

Brill group!

Couple of suitable O rings and plenty of Silicon Mastic.
Flaunch the base properly with cement

How to seal new plastic soil stack to old cast iron stack
 

In article
,
tonyjeffs wrote:
having installed a gf wc, I'm fitting a new plastic soil stack.
The old cast iron stack terminates about 2 foot below ground level, so
rather than do it proproperly, and dig out, which could be one hell of
a job, i've decided to leave a stub of 6" cast iron pipe protruding
above gl. and join the plastic pipe to it.

Go to a decent plumber's merchant and buy the correct coupler for this job.

--
*I don't suffer from insanity -- I'm a carrier

Dave Plowman London SW
To e-mail, change noise into sound.

How to seal new plastic soil stack to old cast iron stack
 

tonyjeffs wrote:
having installed a gf wc, I'm fitting a new plastic soil stack.
The old cast iron stack terminates about 2 foot below ground level, so
rather than do it proproperly, and dig out, which could be one hell of
a job, i've decided to leave a stub of 6" cast iron pipe protruding
above gl. and join the plastic pipe to it.

The plastic sleeve is slightly larger diameter, and-fits snugly over
the outside of the cast-iron, There is a 1mm gap to make watertight.
Since the cast iron from below ground terminates on the inside, there
is a lip, which is liable to catch any falling waste.

What is the best way to seal this junction which won't be accessible
again for 50 years , and taper out the lip? What sticks to plastic?
Thoughts:
Putty mixed with gloss paint; Silicone sealant; grease; Plastic
solvent glue, soft rubber fitting with circlips, other?

Brill group!

Thanks,
Tony

If you are really sure you'll never want to get them apart again you could
use Isopon or some other similar car body filler from Halfords. Several
years ago I had to fit a plastic inspection point to a broken earthenware
soil pipe. I used Isopon to build up the break to a level surface, and then
more Isopon to fit the plastic to it. Seems to be ok with no leaks.

--
Jeff

How to seal new plastic soil stack to old cast iron stack
 

On 12 Feb, 10:39, "Dave Plowman (News)" wrote:
In article
,
* *tonyjeffs wrote:

having installed a gf wc, I'm fitting a new plastic soil stack.
The old cast iron stack terminates about 2 foot below ground level, so
rather than do it proproperly, and dig out, which could be one hell of
a job, i've decided to leave a stub of 6" cast iron pipe protruding
above gl. and join the plastic pipe to it.

Go to a decent plumber's merchant and buy the correct coupler for this job.

--
*I don't suffer from insanity -- I'm a carrier

* * Dave Plowman * * * * * * * * London SW
* * * * * * * * * To e-mail, change noise into sound.

I second this
It is pointless botching a joint that is not failsafe ie with the
plastic inside rather than out
Chris