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cutting into cast iron waste stack bobprokop 03-25-2007
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Posted by on March 25, 2007, 8:00 pm
I've got a plumber (who I really trust) coming out tomorrow to
temporarily cut into one of my main cast iron waste stacks. Reason:
there is a crack in the foundation right behind the stack that is
going to be treated tomorrow with epoxy injection -- and the stack is
in the way.

Once the crack in the foundation has been treated, the plumber is
going to replace the cut-out section of cast iron pipe with PVC.

My worries: the waste stack runs all the way up to the 2nd floor (and
out the roof through the attic, so technically through to the 3rd
floor). Everything I read says you MUST support the stack when making
a cut like this.

I asked my plumber (very reputable company and he has done alot of
work in this house for me -- all of which has been good) if he would
need to support the pipe before making the cut. He said "no" -- but if
when he began to cut he though it needed it, he would support it from
below (in the basement, where he'll be cutting).

I am worried about this. It's a beautiful 1930s Tudor-revival era
brick & mortar home -- built like a tank -- and I don't want to have
all kinds of damage to the plumbing connections in the walls that
connect to this waste stack when it gets cut (I hesitated even doing
this, but the crack in the foundation is something that appears to
have needed attention for a long time -- it gets water, although I've
fixed most of that problem from the outside).

Help. What do I tell my plumber? Do I insist that he install a brace?
Does it need to be a permanent brace? I can't imagine how tying in PVC
w/neoprene gaskets is going to support the weight of this stack. How
does this work? Should I be worried -- or trust this guy (who has 40
years of experience in this area, working on these types of homes)?

Thanks for any guidance you can provide!


Posted by DanG on March 25, 2007, 9:03 pm
It would be fairly cheap and easy to brace the existing stack
before cutting. It is a whole bunch easier to help keep it from
falling than to try to raise it back if it moves. PVC replacement
is probably fine, but it is no big stunt to replace it with cast
iron and no-hub clamps, or reinstall the piece that comes out if
he is using a chain cutter.

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)
dgriff237@7cox.net



> I've got a plumber (who I really trust) coming out tomorrow to
> temporarily cut into one of my main cast iron waste stacks.
> Reason:
> there is a crack in the foundation right behind the stack that
> is
> going to be treated tomorrow with epoxy injection -- and the
> stack is
> in the way.
>
> Once the crack in the foundation has been treated, the plumber
> is
> going to replace the cut-out section of cast iron pipe with PVC.
>
> My worries: the waste stack runs all the way up to the 2nd floor
> (and
> out the roof through the attic, so technically through to the
> 3rd
> floor). Everything I read says you MUST support the stack when
> making
> a cut like this.
>
> I asked my plumber (very reputable company and he has done alot
> of
> work in this house for me -- all of which has been good) if he
> would
> need to support the pipe before making the cut. He said "no" --
> but if
> when he began to cut he though it needed it, he would support it
> from
> below (in the basement, where he'll be cutting).
>
> I am worried about this. It's a beautiful 1930s Tudor-revival
> era
> brick & mortar home -- built like a tank -- and I don't want to
> have
> all kinds of damage to the plumbing connections in the walls
> that
> connect to this waste stack when it gets cut (I hesitated even
> doing
> this, but the crack in the foundation is something that appears
> to
> have needed attention for a long time -- it gets water, although
> I've
> fixed most of that problem from the outside).
>
> Help. What do I tell my plumber? Do I insist that he install a
> brace?
> Does it need to be a permanent brace? I can't imagine how tying
> in PVC
> w/neoprene gaskets is going to support the weight of this stack.
> How
> does this work? Should I be worried -- or trust this guy (who
> has 40
> years of experience in this area, working on these types of
> homes)?
>
> Thanks for any guidance you can provide!
>



Posted by on March 25, 2007, 9:39 pm
> It would be fairly cheap and easy to brace the existing stack
> before cutting. It is a whole bunch easier to help keep it from
> falling than to try to raise it back if it moves. PVC replacement
> is probably fine, but it is no big stunt to replace it with cast
> iron and no-hub clamps, or reinstall the piece that comes out if
> he is using a chain cutter.
>
> --
> ______________________________
> Keep the whole world singing . . . .
> DanG (remove the sevens)
> dgriff...@7cox.net
>
>
>
> > I've got a plumber (who I really trust) coming out tomorrow to
> > temporarily cut into one of my main cast iron waste stacks.
> > Reason:
> > there is a crack in the foundation right behind the stack that
> > is
> > going to be treated tomorrow with epoxy injection -- and the
> > stack is
> > in the way.
>
> > Once the crack in the foundation has been treated, the plumber
> > is
> > going to replace the cut-out section of cast iron pipe with PVC.
>
> > My worries: the waste stack runs all the way up to the 2nd floor
> > (and
> > out the roof through the attic, so technically through to the
> > 3rd
> > floor). Everything I read says you MUST support the stack when
> > making
> > a cut like this.
>
> > I asked my plumber (very reputable company and he has done alot
> > of
> > work in this house for me -- all of which has been good) if he
> > would
> > need to support the pipe before making the cut. He said "no" --
> > but if
> > when he began to cut he though it needed it, he would support it
> > from
> > below (in the basement, where he'll be cutting).
>
> > I am worried about this. It's a beautiful 1930s Tudor-revival
> > era
> > brick & mortar home -- built like a tank -- and I don't want to
> > have
> > all kinds of damage to the plumbing connections in the walls
> > that
> > connect to this waste stack when it gets cut (I hesitated even
> > doing
> > this, but the crack in the foundation is something that appears
> > to
> > have needed attention for a long time -- it gets water, although
> > I've
> > fixed most of that problem from the outside).
>
> > Help. What do I tell my plumber? Do I insist that he install a
> > brace?
> > Does it need to be a permanent brace? I can't imagine how tying
> > in PVC
> > w/neoprene gaskets is going to support the weight of this stack.
> > How
> > does this work? Should I be worried -- or trust this guy (who
> > has 40
> > years of experience in this area, working on these types of
> > homes)?
>
> > Thanks for any guidance you can provide!

Huh -- I never even thought of that. You can replace it with the same
piece? Or new cast iron? I didn't think they even did that anymore...


Posted by RicodJour on March 26, 2007, 9:07 am
bobprokop@yahoo.com wrote:
> > It would be fairly cheap and easy to brace the existing stack
> > before cutting. It is a whole bunch easier to help keep it from
> > falling than to try to raise it back if it moves. PVC replacement
> > is probably fine, but it is no big stunt to replace it with cast
> > iron and no-hub clamps, or reinstall the piece that comes out if
> > he is using a chain cutter.
>
> Huh -- I never even thought of that. You can replace it with the same
> piece? Or new cast iron? I didn't think they even did that anymore...

If the plumber is lucky, and the existing pipe doesn't crack, he may
be able to reuse the piece. It is never a good idea to count on being
lucky and the pipe being in good condition.

You can still get cast iron, and it is still used, but the bell-shaped
hub connections packed with oakum and lead are pretty much relics of
the past. Google Fernco to see what is generally used nowadays.

R


Posted by willshak on March 26, 2007, 11:05 am
bobprokop@yahoo.com wrote:
> I've got a plumber (who I really trust) coming out tomorrow to
> temporarily cut into one of my main cast iron waste stacks. Reason:
> there is a crack in the foundation right behind the stack that is
> going to be treated tomorrow with epoxy injection -- and the stack is
> in the way.
>
> Once the crack in the foundation has been treated, the plumber is
> going to replace the cut-out section of cast iron pipe with PVC.
>
> My worries: the waste stack runs all the way up to the 2nd floor (and
> out the roof through the attic, so technically through to the 3rd
> floor). Everything I read says you MUST support the stack when making
> a cut like this.
>
> I asked my plumber (very reputable company and he has done alot of
> work in this house for me -- all of which has been good) if he would
> need to support the pipe before making the cut. He said "no" -- but if
> when he began to cut he though it needed it, he would support it from
> below (in the basement, where he'll be cutting).
>
> I am worried about this. It's a beautiful 1930s Tudor-revival era
> brick & mortar home -- built like a tank -- and I don't want to have
> all kinds of damage to the plumbing connections in the walls that
> connect to this waste stack when it gets cut (I hesitated even doing
> this, but the crack in the foundation is something that appears to
> have needed attention for a long time -- it gets water, although I've
> fixed most of that problem from the outside).
>
> Help. What do I tell my plumber? Do I insist that he install a brace?
> Does it need to be a permanent brace? I can't imagine how tying in PVC
> w/neoprene gaskets is going to support the weight of this stack. How
> does this work? Should I be worried -- or trust this guy (who has 40
> years of experience in this area, working on these types of homes)?
>
> Thanks for any guidance you can provide!
>


If not supported, the burden of holding the waste stack from dropping
would be the connections of the drain pipes from sinks, tubs, and
toilets to the waste stack. Unless there is some strapping somewhere
holding the waste stack, I would be concerned too.

--

Bill
In Hamptonburgh, NY

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