I have a drain pipe that is under the slab in the house , the house was
built in 1960, I want to connect another service to run to the
apartment just built, the old pipe is inside the slab and I need to
connect into it , it's that old Cast metal , and I want to put a T
connection so I can have a access to snake out the system, 1 how should
I get to the old pipe in the slab , by saw or just drill holes and chip
from around it slowly to gain access , and how should the connection of
the T be made, welding, soder , of with a boot and sleeve.
Basement or ground floor slab?
What is the existing finish on the concrete? Carpet, tile,
exposed concrete??? It makes some difference on how you break the
hole and how you repair the hole.
How do you know where the pipe is? So you can hope to be over it
with your hole.
How are you planning to cut the cast iron? Chain cutter
(ratcheting or lever handle), gasoline Quickee type saw, Sawzall
with a grit edge blade (very slow)? Each choice makes a huge
difference on how big the hole needs to be.
The pipe you are after may be as much as 2 feet or more down under
The slab will be about 4" thick. It may have WWF (remesh), rebar,
or post tension cables, or nothing.
It is very possible to just swing a sledge hammer and break
through the floor, once you have a hole it is actually quite easy
to keep breaking out the edges of the hole to make it bigger. You
really want to have a pretty good idea where the pipe is.
IMHO you will be best off planning to tie in plastic fittings
using Fernco type connectors. If it is 4" pipe you will be
removing a foot or more of the existing pipe (fitting with nipple
on each end). You do not weld cast iron pipe, you do not solder
cast iron. The very fact that you are asking suggests that maybe
you should break the hole and hire a plumber to make any and all
connections, you will probably time and money ahead in the long
run. Cutting cast iron is not usually for the DIY type.
A live Singing Valentine quartet,
a sophisticated and elegant way to say I LOVE YOU!
Never having even attempted what you're about, my thoughts are truely stray
Me, I'd forget about tapping into a cast iron pipe imbedded in concrete.
There's got to be some way to connect to the sewer that's not under or in
concrete. Sewer pipe is cheap. So what if it take 100' of plastic pipe to
get to somewhere the sewer is surrounded by only dirt?
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