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teegonzo · Jul 28, 2010, 05:53 AM

So many different types of PVC piping. I'm building an RV space approx: 300' away from my septic tank and need to know exactly which type of sch 40 PVC to use for the sewer line... Lowe's want to know; under pressure or not, will the fitting be under pressure or not, how will you be building the cleanouts?? AHHHHHHHHHHH!! All I know is that it will be buried and need some cleanout in there... HELP!!

hkstroud · Jul 28, 2010, 06:05 AM

Schedule 40 PVC, 4" diameter, sloped 1/4 to 1/8" per foot, not under pressure. Clean out installed ever 100 feet or less. Sewer snakes are usually 100' long or longer. Clean outs are made with sanitary tee pointed in direction of flow.

speedball1 · Jul 28, 2010, 07:02 AM

Let me add a bit to Harolds Post. He was correct in the pipe type and size.
My code,( Standard Plumbing Code) mandates a regular sanitary tee at the house brought up to grade with a clean out. It also mandates a clean out every 75 foot and at every change of direction over 45 degrees. It goes on to say that while the tee at the house clean out shall be a regular tee that can only be snaked one way the other clean out tee shall be two way tees, (see image) so the sewer can be snaked from both directions if found necessary. Good luck, Tom

hkstroud · Jul 28, 2010, 08:56 AM

Thanks Tom.

Didn't know that they made such a tee. Going to have to get one, (just to have), real neat fitting.

KISS · Jul 28, 2010, 10:13 AM

Schedule 40 underground is too expensive. Gasketed should be allowed. See Keith Specialty Store - Honeywell controls, pex tubing, oil burner parts, fuel oil nozzles.

Look under the Rain, sewer and drain heading and PVC.

Use Schedule 40 DWV for anything above ground. There are adapters between the series.

Lowe's didn't seem to have any gasketed fittings although they carry SDR 35 in non-gasketed. Gasketed fittings will allow movement.

4" PVC can be intimidating to cement. Practice at least once. Remember cleaner, primer and cement and use the correct type.

hkstroud · Jul 28, 2010, 11:25 AM

I'd rather pay the price for Schedule 40 than have the thin wall crushed when someone (septic tank pumper truck) drives over it.

I guess it all depend on how far underground it is.

speedball1 · Jul 28, 2010, 04:27 PM

I should have added our inspectors make us use purple primer when we join PVC. The reason for this is that if clear primer's used they can't tell if we primed before gluing. With purple primer there's no question on inspection. Good luck, Tom

Milo Dolezal · Jul 29, 2010, 08:54 AM

My 2 cents...

You could also install 4" ABS. At $40.00 a stick (20' each) it will run you about $600.00 for the pipe + fittings and glue. So the total cost of materials, including clean outs will be somewhere under $1K.

I agree with Tom: install clean out every 75' / at every 90 degree transition and/or after sum of turns totaling 135 degrees. Snakes lose their torque strength at 70 or so - especially when you have several turns along the way. It is always good to have more clean outs than less. Also, it is cheap to install them at the time of new sewer installation. And don't forget: you start you run with clean out at 0' (zero) feet.

Because of the developed length, make sure you first measure how deep is your septic and install new pipe accordingly. Unless your RV is sitting on the hill, septic may not be deep enough...