how to connect plastic DWV pipe to 1940's cast iron DWV


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Old 03-07-06, 09:18 AM
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how to connect plastic DWV pipe to 1940's cast iron DWV

ok i am renovating parts of a 1940's wood frame building and it has the old 40s style cast iron hub and spigot with lead and oakum joint type of DWV piping system

well years ago in my younger days i removed a couple stacks that used ot serve as venting for some of the upstairs drainage

i took them down all the way down to the concrete slab floor in the ground floor, they have a 45 degree Y

see part D of this illustration:
http://www.tpub.com/content/engineer...4069_288_1.jpg

its not a true Y, its the Y that runs straight up to and through the roof, and the branch is the 45 degree and has a cleanout plug threaded in it, just above the concrete slab

well now i want to rebuild a small basic bathroom at/above(upstairs and exactly how it was originally) one of these stacks and i cant get the lead and oakum out of the bell/hub so that i can put in schedule 40 pipe and run it through the roof and such

what do i do ?

what is the trick to getting this lead and oakum out of the hub ?

it seems impossible

how did they do it ?

and when i put the schedule 40 pipe into the hub what do i used to pack/seal it ?

i cannot use hubless or anything else, as the Y is in the concrete

it is 4" by the way

will the sch 40 4" even fit inside the 4" iron hub ? or am i gonna be in trouble here?



thanks for anything
 
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Old 03-07-06, 09:35 PM
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Originally Posted by fast68
i cant get the lead and oakum out of the bell/hub so that i can put in schedule 40 pipe and run it through the roof and such
Too bad you removed that old pipe.


> what is the trick to getting this lead and oakum out of the hub ?

Get it really hot.


>how did they do it ?

Patience.


> and when i put the schedule 40 pipe into the hub what do i used to pack/seal it?
Several choices.
Rubber doughnut or (e.g., Black Swan) soil pipe cement.


> i cannot use hubless or anything else, as the Y is in the concrete
You can dig out the concrete.



> it is 4" by the way
> will the sch 40 4" even fit inside the 4" iron hub ?

They are the exact size. 4" IPS.

3" will work just fine and is easier to work with.
You can bush to 4" at the bottom.
 
 

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