Double vanity plumbing slope and drainage issues
Pipes pitched backward and poor slope off the copper line create improper drainage configuration and visual concerns. These errors prevent proper wastewater flow and risk leaks or standing water in the system.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1using a street 90 instead of a double tee and two 45'sDid this help you?
- 2Install shut off valves on the two pipes sticking out of the wallDid this help you?
- 3Cut the PEX and use expansion PEX, sharkbites, or crimp angle stopsDid this help you?
- 4Using a 1 1/2 inch wye and 45-degree fitting even if it may not fully comply with plumbing codes or proper wet venting standards.Did this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“replacing plumbing for double vanity. The pipes are pitched back for proper drainage I know i used ferncos but that was all i had lol”source ↗
“Looks bad, I'm worried about the slope off the copper line you tied into.”source ↗
“What do i need to do to the hot and coled lines to make sure they dont spray everywhere when we turn the water back on as the new vanity isnt going in right away?”source ↗
“I have some rough sink plumbing from an old single vanity that I’m interested in modifying into a double vanity.”source ↗
“However, I’m trying to determine if it’s best to add a second sanitary tee for the new sink, or if I should just add a wye and use a single double sanitary tee or double fixture fitting. Any ideas on the best way to tackle this?”source ↗
Where this came up
People with this problem also raised
- 50How to fix a leaky plumbing valve that doesn't fit a new faucet
- 5Can you convert a double sink to a single without replacing the countertop?
- 3How to install a vanity over floor pipes in a tight space
- 27Can you fix a cracked or broken kitchen sink yourself?
- 2Converting a bathtub to a shower with a 1 1/4 inch drain
- 8Can I replace a rental laundry tub to install a dishwasher?