copper pipe schedules

[Robert La Bianca]

I’m going to run new supply and sanitary lines under a slab. What schedule of copper do I use for the supply and what schedule pvc for the drain (this will be for a slop sink and washing machine) the run will be about 30 ft. how much pitch do I need for the drain?

[Retired plbg1Participant]

Use Sch. 40 pvc for drain lines, use type K soft copper underground and loop it back and forth so you do not have any joints under slab, if you have joints use hard solder like silfuss.

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Art retired plbg

[Retired plbg1Participant]

I forgot when you come through con. Floor put armor flex pipe insulation on pipe comming out of slab before they poor con.

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Art retired plbg

[larrywParticipant]

Thanks, R.P. not quite sure what you mean by looping back and forth though. Also what pitch should the drain line be?
Larry

[Retired plbg1Participant]

Pitch can be 1/8″ per ft. of pipe + or – usualy about 1″ per 10 ft. of pipe, if you are deep you can give it a 1/4″ per. ft. What I meant about looping pipe is like say you are running pipe to sink straight ahead and there is a Lav. before you get to sink well instead of putting a tee in line and run pipe to lav. you run a seperate pipe to lav and sink. Say you had 3 fix. to run cw too, well where your source is you start and run 1 line to each fix an connect the 3 lines and then connect to the source. If you send me your e-mail add. i will draw it up for you.

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Art retired plbg

[larrywParticipant]

Thanks again, no need to draw it up.
Larry

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