can I use a reducing toilet flange with a reducing closet bend? (newbie)

[graysqwrl]

I was at home depot and the only closet bend they had was a 4 x 3 which I assume is to reduce from a 4" flange to a 3" drain (correct?)

I, also, noticed that the 4 x 3 reducing flange seems to sit perfectly into the 4 x 3 closet bend.

Is there a problem with using these two together?

It seems a little counter intuitive, but also seems to fit like a glove.

Please let me know if this is acceptable for me to use.

thanks!

[HayZee518]

closet flange vs closet bend

the toilet flange has an external size of 4 inch. the inside throat has a size of 3 inch. the 3 " spigot fits into the hub of a standard 3" plastic pipe. the reducing closet bend changes direction by ninety degrees to a 4 inch pvc pipe system

[graysqwrl]

Just so I'm 100% on this...

the 4 x 3 closet bend is made to go from 3" (toilet side) to 4" (main stack side)

It's NOT meant to go 4" (toilet side) to 3" (main stack side)

it expands... rather than reduces?

thank you!

[HayZee518]

what is your main waste line size now? is it 4 inch or 3 inch plastic. most cast iron is [was] 4 inch. this seems to be a good place to start.

[graysqwrl]

This bathroom is an addition... so I can make the stack for this bathroom whatever size I want/need.

The main sewer line (in the ground) is 4"

I already spliced a 4" combo wye 1/8th bend into the main (horizontal) sewer line to accomodate this bathroom.

I haven't yet decided whether the stack should remain 4" or 3"

Only items on this stack would be sink, tub, & toilet

Any suggestions would be appreciated.

[HayZee518]

ok. did you include another clean out where you spliced in your new line? you should if you didn't. the main stack for another toilet should be the same as the drain you are putting in. i.e. 3 inch waste line the stack should be 3 inch. a tub or a sink can use a side inlet to the main line for the toilet. this is 1 1/2 inch. at the sink or tub use 1 1/2 inch for the run. the drains should be within 6 feet of the waste or vented line. you usually decrease line size downstream of the main not increase it. example a toilet would use a three inch not a four inch.
when I re-plumbed my house the main line is 3 inch throughout. the stack is 3 inch. my kitchen is about 12 feet from the main stack so I put in a new stack just for the kitchen sink. this one is 2 inch through the roof. connection at the sink is a sanitary TEE. upper part goes to the stack (2 inch) inlet is 2 inch reduced to 1 1/2 inch for the sink waste line, horizontal waste line to the main waste line is 2 inch plastic. the way I set it up is that anywhere on the main line, any effluent draining into the main, flushes out the main line going to the street.

[graysqwrl]

thank you!

That helps tremendously.

I have one other question:

I'm not confident in the venting system/plumbing for the rest of my house (house built in 1905.. there seems to be a lot of scotch tape and hot glue holding this place together)

Therefore, I wanted to run an independent vent for this stack.

The house is two floors with a 1 floor addition that was built on the back of it, which is where the bathroom is located.

Is it ok for me to vent above the 1 floor roof line?

Or do I have run it all the way above the 2nd floor roof line?

thanks again!

[HayZee518]

its usually vented above the second floor roof line so that sewer gasses don't enter any windows at THAT roof level [addition] you can't have enough of vents. they will just re-inforce what's already there.

[HayZee518]

give me your email address in a private msg. I'll draw for you what I have - you can take it from there.

[graysqwrl]

thank you!

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