Are there any special requirements when connecting all the vents together in the attic? Do they need to be pitched? Can you connect them to one another any way you want? i.e. from the top, side, bottom of the main drain? I know I have to go up to 3" before it goes throug the roof...

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Originally Posted by johnwi3

Are there any special requirements when connecting all the vents together in the attic? Do they need to be pitched? Can you connect them to one another any way you want? i.e. from the top, side, bottom of the main drain? I know I have to go up to 3" before it goes throug the roof...

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All the vents MUST be sloped back to the to the source using 1/4 inch to the foot. You may make as many bends as you wish as long as slope's maintained and the it revents back to the 3" roof vent. While it makes for a neater job to have just one pipe coming out the roof as a vent, be advised that there's a down side. If you have to snake one of the revents you will have to take your equipment up to the attic and cut the revent out of the system. You will then have to snakefrom the attic and reconnect everything back. This works out to more hassle if you do it and a increased labor cost if a plumber comes out. Best of luck, Tom

Well all the drains and vents are done... I want to test the system, I've capped off all the stub outs in the kitchen and bathrooms. Can I cap the tub drain with a cap.. is the p-trap installation part of the finish? When I pressure test it what is the pressure to fill it too and how long should it stay at pressure? Thanks.

Good morning John,

We cap off all the stubouts and openings in the house and inflate a test ball in the sewer cleanout. We then take a hose up ,on the roof and fill the highest roof vent until it runs over, We then call a inspection for in the AM and let it set overnight. Good luck, Tom

Well I did the whole system over, new drains, stacks, vents. So no test needed?

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Originally Posted by johnwi3

Well i did the whole system over, new drains, stacks, vents. So no test needed?

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I don't understand John, I never said no test was needed. I told you how to test the system, and yes, a test should be run even if there's no inspection. And if you didn't pull a permit on this job,(as you should have) you won't have to call for a inspection. Good luck, Tom

A permit was pulled and an inspection will be done. I was under the impression that the test is to be completed when all the drains and vents are complete... this way the whole system can be tested.