Discover the simple vacation trick of placing an upside-down glass and paper in your sink before leaving home, plus practical ways to check for leaks, pests, and plumbing problems while you’re away.
Going on vacation is exciting, but leaving your home unattended for several days can create a few unexpected problems. A small leak, plumbing issue, or unwanted pest can cause trouble before you return.
That’s why some homeowners use a simple upturned glass and paper trick before leaving.
It isn’t a guaranteed security device, but it can serve as a basic visual reminder or indicator that something may have happened around the sink while you were away.
How the Trick Works
Before leaving, clean and dry the sink.
Place a small sheet of paper or tissue flat inside the sink. Then place an empty glass upside down on top of it.
The idea is that if water enters the sink while you’re away—for example, because of a dripping faucet or another plumbing issue—the paper may become wet or move from its original position.
When you return, you can immediately look at the paper and glass.
If everything is still dry and positioned exactly as you left it, that’s a reassuring sign that nothing obvious happened in that area.
Why Put It in the Sink?
A sink can sometimes reveal problems that aren’t immediately obvious.
A slowly dripping faucet, a small plumbing leak, or water coming from another source may leave traces.
The paper makes those traces easier to notice because dry paper looks very different from wet or displaced paper.
The upside-down glass provides a simple reference point.
However, this trick shouldn’t be treated as proof that your plumbing is leak-free. A leak can occur elsewhere in the house without affecting the sink.
The Glass Isn’t a Magic Detector
Some versions of this household tip make the glass sound like a sophisticated security device.
It isn’t.
The glass and paper are simply a low-tech visual indicator. They can help you notice a change, but they cannot detect every type of leak, flood, or plumbing problem.
For longer trips, more reliable precautions are worth taking.
Before You Leave, Check the Faucet
Make sure all faucets are completely turned off.
Look underneath the sink for signs of moisture, dripping, corrosion, or damaged pipes.
If you notice an existing leak, fix it before leaving rather than assuming the glass-and-paper trick will protect you.
Consider Turning Off the Main Water Supply
If your home will be empty for an extended period, shutting off the main water supply can significantly reduce the risk of a major water leak.
Whether this is appropriate depends on your home, plumbing system, heating system, appliances, and local climate.
If you’re unsure, ask a plumber what is recommended for your particular setup.
Don’t Forget the Washing Machine and Dishwasher
Supply hoses connected to appliances can also develop leaks.
Before going away, inspect the hoses and connections around:
- Washing machines
- Dishwashers
- Refrigerators with water connections
- Water heaters
- Sinks and toilets
If something looks damaged or damp, address it before your trip.
What About Pests?
Another reason people like simple sink tricks is that they can make it easier to notice unexpected activity.
However, a piece of paper and an upside-down glass won’t prevent insects or rodents from entering your home.
If you’re concerned about pests, remove food sources, empty trash, clean kitchen surfaces, and make sure doors and windows are properly sealed.
A Better Vacation Checklist
Before locking the door, take a few minutes to check the basics:
- Turn off unnecessary appliances.
- Check faucets and visible plumbing.
- Empty perishable food from the refrigerator if appropriate.
- Take out the trash.
- Close and lock windows.
- Check doors and garage entrances.
- Consider shutting off the main water supply for longer absences.
- Set lights or timers if desired.
- Make sure someone you trust knows you’re away if necessary.
You can also take a quick photo of important areas such as the sink, utility room, or water meter before leaving. That gives you something to compare with when you return.
The Simple Trick Is Really About Peace of Mind
The upside-down glass and paper method won’t replace proper home preparation, but it’s an inexpensive little trick that can help you notice whether something changed while you were away.
Sometimes the simplest visual indicators are useful precisely because they’re easy to set up and easy to check.
So before your next vacation, you can place a dry piece of paper in the sink and an upside-down glass on top—but think of it as a simple reminder and visual check, not a guaranteed leak detector.
A few minutes of preparation before leaving can save you from discovering an unpleasant surprise when you get home.