Hello,
Nice site, have a couple questions.
South Florida plumbing
adding a toilet and shower to bedroom next to garage. The drain runs under wall, too bad it turned out to be a 2 incher. (Cast Iron to stack, also 2) Going to run a pipe under 16 feet of slab to backyard, then femco into 4 in pipe at septic tank line. That line will 45 to septic tank about 60 feet.
1. Can I use 3 inch pipe instead of 4, only thing on this line will be toilet and shower. I can make line toilet only if needed.
2. If not, can toilet be 3 inch for 16 feet and 4 inch to septic?
3. Next I need to vent, how from from closet flange can the vent be and best way, 45 Y, sani T, ?

Thanks




Edited 2 times.

You want works or code correct?the bath group would need a full sized three inch vent.it could run to the four inch tee as three.but should have a co as it leaves the building.As the shower must be dry vented it must leave the horizontal above 45%.Works??? changes the vent to two inch.an auto vent would not be advisable with two main fixtures and no other vent to septic. .Be care full of the pitch needed at smaller size diameter tubing. As it often works out better to go larger with less pitch per foot.If your plan was to use an existing stack as the drain for the sink you might be better off using a new wet vent drain only re-vented to tie the new group to the existing vent system.

Thank you for your reply.
This is layout so far. Would this work? (aerial view)
It takes a min to load pic...
If I made toilet only would it be better?
I have never seen a 3 inch vent before ?
I will check pitch before I choose the smaller pipe.
What is code anyway? 4inch or 3inch ?


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the vents may NOT be horizontal 'on the flat', they must be 'rolled' to AT LEAST 45° upwards (90° would be perfect, but impractical)

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Thank you
I can turn the 45 so the vent pipe is on top,then 90 to wall, I have plenty of room, would this be acceptable?

IMO: yes

for your protection: get a permit and make sure the job is inspected & 'signed off'

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"Measure Twice & Cut Once" - Retired U.A. Local 1 & 638

Thank you,
I do have, thank you.
Will the 3 inch drain pass? or will they insist on a 4?
Is shower ok on the flat after toilet like pic?
1 Toilet and shower only on this line
I have code book, but it is not very clear on this, it says min 3



Edited 2 times.

no!! you vented the toilet or group.you must vent the shower from the toilet line.

I am real sorry about the pics, I understand and appreciate the effort you are giving me. This is what I have so far. This is a new install, no sink, just what you see here. (No wet vent) Nothing else is on this line, Toilet and Shower only. It is a complete new install with drain to Septic Tank. Hope I did better this time around.... Thanks again

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looks like you learn quickly or asked the local inspector for his take.If at all possible to atmospheric the vent or tie it to another vent leaving the roof. You would want to spend the dollars to do so.even a long vent with no positive relief value is a poor install.You separated the dwv installed and even foaming of the septic inlet could cause trap movement,to your addition fixtures. which leads to dwv failure.

You made me realize I had vent on wrong side. I will vet to stack in wall that is already there.
Thanks for the help....