Very discouraging to fail a self-test on my waste stack. After consulting with several friends in the trades, and then getting a plumber up to the site, they were all unanimous that I should install cleanouts on every pipe going in to the slab. Installing them will allow me to isolate all the waste plumbing above the slab from the already-tested-and-passed plumbing below the slab and from the septic line that is not designed for high pressure.
The carcasses of the pipes I cut out in order to install cleanouts.
Cleanouts installed in the main waste stack (left) and the downstair shower vent (right).
Cleanout in the downstair toilet vent.
Cleanout in the downstairs wetbar sink stack.
Cleanout downstream from the washing machine p-trap and vent.
The good news from the plumbers who pre-inspected everything was that I appear to have done everything else correctly. I won't be able to use an air admittance valve on the two top floor toilets, but connecting their vents to each other and running them out the high side of the roof will be fairly easy and straightforward.
I had hoped to retest after installing the cleanouts, but Amazon shipped me clean-seal plugs for 1-1/2" pipes, not the ones for 2" pipes that I ordered. I'll pick up the correct 2" clean-seal plugs in a plumbing supply store in Ballard on Monday.
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