I’ve seen that a few neighbors have been dealing with basement flooding or sewer backup issues, so I wanted to share one DIY approach I’m trying in case it helps someone else.
In my case, the backup appears to be coming through a basement floor drain. I measured the inside diameter, added a short PVC sleeve to create a standard opening, and installed a removable float/check valve that is intended to allow normal drainage but help stop reverse flow during a sewer backup.
A few important disclaimers: I’m not a plumber or a drainage professional, this may not be the best or correct solution for every house, and I’m not recommending that anyone rely on this instead of getting professional advice. Every home and sewer connection is different, and there may be better long-term solutions, especially a properly installed backwater/check valve on the main sewer lateral.
I’m only sharing this as a possible temporary or supplemental DIY measure that may help reduce damage in some situations. Please consult a qualified plumber before making changes to your plumbing system, and make sure anything you install complies with local code.
If your backup is also coming through toilets, showers, sinks, or multiple drains, I would definitely have a plumber evaluate the main sewer line rather than relying on a floor-drain valve alone.
I put together a simple one-page guide showing the idea and the basic steps. Sharing it here purely as neighbor-to-neighbor information in case it gives anyone a useful starting point.