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Old 07-20-2013, 04:04 PM   #16
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Excuse my ignorance but what is final air? Pressurize the vent system?
Yes. Air, water, smoke are all common methods used to test the integrity of DWV (Drain, Waste, Vent) systems at various stages of completion.

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Old 07-20-2013, 05:37 PM   #17
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Yes. Air, water, smoke are all common methods used to test the integrity of DWV (Drain, Waste, Vent) systems at various stages of completion.
For my plumbing rough in....I had to plug ALL of stubbed out drains...and since it's a 2-story addition to an existing house...block off the new section where it joins with the old section.....and then fill that whole b!tch up with water until it was coming out the vent pipes on top of the 2nd story.

I remember being up there on the roof with the water hose filling it up and thinking, "God, I hope it doesn't leak"....then it dawned on me....that is why you leak test....to make sure there are NO leak. Sat there full of water for a day...

Using some engineering math...top vent is about 24' up....which means I had a little over 10 PSI of pressure on the bottom....

I feel a whole lot better now having done that test.
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Old 07-20-2013, 06:09 PM   #18
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What's funny is when you have a test plug blow in the basement floor drain.
Never seen electricians move that fast
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Old 07-20-2013, 08:35 PM   #19
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Excuse my ignorance but what is final air? Pressurize the vent system?
A final air is a pressure test of the entire drainage waste and vent system using a manometer. It puts 1 ounce of pressure and is done after all fixtures are installed and traps fulled with water. The main drain exiting the house and the vents out the roof are sealed to perform the test.

It shows all leaks by not holding a 1 inch water column on the manometer.

Even pipes with a screw will show....

In 10 years the following examples of what has been found in new homes.

Vents in walls totally cut out
Top of 3 inch drains with drill holes through them by electricians
Shelfing and cabinet guys using pipe as a stud
Siding guys using the 3 inch drain pipe as a stud
Bad wax ring seals on toilets
Toilets with pinholes in there own traps. All makes and models
Nylon bushings on traps not sealing

Etc Etc.

In the end we protect the home owner the builder and the plumber. A lot of potential lawsuits have been avoided by just the plumbing inspector doing there job in a correct manner. I can only talk for those under the IPC code. I do not know what the UPC requires for test.

As a minimum a new construction project may have a 5 lb air test on it's underground. Then a 5 lb air test on the whole house prior to covering. Then a final air test of 1 ounce. We will use a water test but plumbers that work in this county have found them not reliable as an air test.

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Old 07-22-2013, 09:30 AM   #20
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I will confess to this:

3/8" stainless screw with a small rubber washer.
yep
Except, i used silicone (instead of a rubber washer) before installing the screw.
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Old 07-24-2013, 09:00 AM   #21
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Thanks for the explanations guys.

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