pvc under slab

[David Munro]

I have 3 questions. I am installing a sink only drain in a garage to a cesspool system. I am placing it under the slab and core drilling through the foundation block. My first question is do i need a sleeve through the concrete block? my next question is can the pipe exit upward through the slab poured in the concrete or do I need a sleeve here also? My third question, is 2.5 inch pipe large enough or is there a minimum size required.
thanks for any help.

[Retired plbg1Participant]

2″ is ok as long as your code goes along with it. After you get outside use 3′ pipe to cesspool and put a CO. every 50′. Also run a vent through the roof. Check your code for vent size here you could use 1-1/2″ up to 18″ below roof and increase it to 2″ through roof.

[Retired plbg1Participant]

Its always good to put sleeve in wall and them waterproof around it, our codes lets you run 10′ 2′ underground, you dont need slleve in floor.

[pfelmeyParticipant]

Thanks for the help!!!!

[Author]

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