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Supporting Cast Iron DWV Pipe Wayne Whitney 04-09-2008
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Posted by Wayne Whitney on April 9, 2008, 2:40 pm
Hello,

I'm planning to do a 25' run of 2" cast iron pipe between floor joists
and am thinking about how to properly support it. There are pipe
hangers that I could use to support it from above, so I would have to
attach these to the subfloor. I was wondering if instead there is a
type of support I could use that would attach to the joists on either
side. Something like the expandable bar support on a fan-rated
ceiling electrical box. Any suggestions or pointers?

Thanks, Wayne

Posted by dpb on April 9, 2008, 2:42 pm
Wayne Whitney wrote:
> Hello,
>
> I'm planning to do a 25' run of 2" cast iron pipe between floor joists
> and am thinking about how to properly support it. There are pipe
> hangers that I could use to support it from above, so I would have to
> attach these to the subfloor. I was wondering if instead there is a
> type of support I could use that would attach to the joists on either
> side. Something like the expandable bar support on a fan-rated
> ceiling electrical box. Any suggestions or pointers?

Just plumbers' tape (the perforated metal strapping) would work fine as
long as use adequate fasteners.

But, one has to ask why, in this day and age one would use cast iron?

--

Posted by Mikepier on April 9, 2008, 3:17 pm
> Wayne Whitney wrote:
> > Hello,
>
> > I'm planning to do a 25' run of 2" cast iron pipe between floor joists
> > and am thinking about how to properly support it. =A0There are pipe
> > hangers that I could use to support it from above, so I would have to
> > attach these to the subfloor. =A0I was wondering if instead there is a
> > type of support I could use that would attach to the joists on either
> > side. =A0Something like the expandable bar support on a fan-rated
> > ceiling electrical box. =A0Any suggestions or pointers?
>
> Just plumbers' tape (the perforated metal strapping) would work fine as
> long as use adequate fasteners.
>
> But, one has to ask why, in this day and age one would use cast iron?
>
> --

Or even 2 1/2" or 3" conduit C clamps and clamp them to the side of
one joist

Posted by Wayne Whitney on April 9, 2008, 3:22 pm

> Or even 2 1/2" or 3" conduit C clamps and clamp them to the side of
> one joist

That would work except I need to traverse from one side of the joist
cavity to the other side over the course of this 25' root. So I could
do that at the ends, but I still need a solution for the middle two
supports.

Thanks, Wayne


Posted by Wayne Whitney on April 9, 2008, 3:20 pm

> Just plumbers' tape (the perforated metal strapping) would work fine
> as long as use adequate fasteners.

Yeah, I thought of plumber's tape, but I was looking for something
more rigid. An expandable bar would work great.

> But, one has to ask why, in this day and age one would use cast
> iron?

Cast iron is quieter and I may wish to finish my basement.

Wayne

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