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Diameter of drain from watercloset millinghill 06-11-2008
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Posted by on June 11, 2008, 1:21 pm
In the plumbing section for toilets at HomeDepot, I often see fittings
to transition from 4" to 3" diameter drain pipe for toilets. Is 3"
diameter acceptable size for toilet drains?

I'm remodeling and must replace most of my bathroom plumbing down to
the main drain. Should I consider reinstalling by using 3" PVC? (I
currently have 4" dia. cast iron).

Thanks,
-Theodore

Posted by RicodJour on June 11, 2008, 1:24 pm
On Jun 11, 1:21 pm, millingh...@yahoo.com wrote:
> In the plumbing section for toilets at HomeDepot, I often see fittings
> to transition from 4" to 3" diameter drain pipe for toilets. Is 3"
> diameter acceptable size for toilet drains?
>
> I'm remodeling and must replace most of my bathroom plumbing down to
> the main drain. Should I consider reinstalling by using 3" PVC? (I
> currently have 4" dia. cast iron).

Most codes allow it, but it's between you, your local code and the
inspector's interpretation.

R

Posted by DerbyDad03 on June 11, 2008, 1:48 pm
On Jun 11, 1:21=A0pm, millingh...@yahoo.com wrote:
> In the plumbing section for toilets at HomeDepot, I often see fittings
> to transition from 4" to 3" diameter drain pipe for toilets. Is 3"
> diameter acceptable size for toilet drains?
>
> I'm remodeling and must replace most of my bathroom plumbing down to
> the main drain. =A0Should I consider reinstalling by using 3" PVC? =A0(I
> currently have 4" dia. cast iron).
>
> Thanks,
> -Theodore

I don't know if this will enter into your decision making process, but
it is my understanding that cast iron pipes muffle the sound of
flushing water much better than PVC. If the pipes run near any type of
living space, such as a finished basment, you might want to consider
retaining the cast iron.

Posted by Pipedown on June 11, 2008, 3:31 pm

On Jun 11, 1:21 pm, millingh...@yahoo.com wrote:
> In the plumbing section for toilets at HomeDepot, I often see fittings
> to transition from 4" to 3" diameter drain pipe for toilets. Is 3"
> diameter acceptable size for toilet drains?
>
> I'm remodeling and must replace most of my bathroom plumbing down to
> the main drain. Should I consider reinstalling by using 3" PVC? (I
> currently have 4" dia. cast iron).
>
> Thanks,
> -Theodore

>I don't know if this will enter into your decision making process, but
>it is my understanding that cast iron pipes muffle the sound of
>flushing water much better than PVC. If the pipes run near any type of
>living space, such as a finished basment, you might want to consider
>retaining the cast iron.

If the PVC pipes are hung with the right hangers the sound coupling is
minimized. Application of adhesive sound damping mats can get rid of most
of the rest of the noise. Second story baths are most likly to make noise,
its not always a problem.



Posted by hallerb@aol.com on June 11, 2008, 3:52 pm
>
> On Jun 11, 1:21 pm, millingh...@yahoo.com wrote:
>
> > In the plumbing section for toilets at HomeDepot, I often see fittings
> > to transition from 4" to 3" diameter drain pipe for toilets. Is 3"
> > diameter acceptable size for toilet drains?
>
> > I'm remodeling and must replace most of my bathroom plumbing down to
> > the main drain. Should I consider reinstalling by using 3" PVC? (I
> > currently have 4" dia. cast iron).
>
> > Thanks,
> > -Theodore
> >I don't know if this will enter into your decision making process, but
> >it is my understanding that cast iron pipes muffle the sound of
> >flushing water much better than PVC. If the pipes run near any type of
> >living space, such as a finished basment, you might want to consider
> >retaining the cast iron.
>
> If the PVC pipes are hung with the right hangers the sound coupling is
> minimized. =EF=BF=BDApplication of adhesive sound damping mats can get rid=
of most
> of the rest of the noise. =EF=BF=BDSecond story baths are most likly to ma=
ke noise,
> its not always a problem.

boy we just replaced our bath plumbing above kitchen, just sink and
tub.

its very noisey, you can hear the water running...........

a toilet would make more noise

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