Do moisture meters actually work through ceramic tiles?
Moisture meters often give false positive wet readings when used over ceramic tiles, leaving homeowners uncertain about whether there is actual water damage or a hidden leak. This confusion makes it difficult to find the true source of moisture problems, even when surrounding areas are completely dry.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Testing adjacent neighbor's walls with a meter for comparison
- 2Checking the siding on the opposite side of the wall
- 3Using a whole-home dehumidifier to lower indoor humidity
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Do these moisture meters even work over tiles?”source ↗
“Curious what you all think.. readings behind these tiles show wet… went to the neighbors with same layout and theirs sad dry, but do we trust these on ceramic tiles??”source ↗
“We have a springtail infestation, which I thought started on the first floor but everywhere as far as I can tell (bathroom showers, sinks) are dry and we have humidity down to the 40s in the house via a whole home dehumdiifer and I am in Houston. Brand new house and these bugs are driven by moisture so I’ve been trying to find a moisture source for ever.. this is a new build. Happened to use the meter there and a few other tiles behind it and showed wet.”source ↗
Where this came up
People with this problem also raised
- 27Water dripping from electrical switches behind walls
- 3Can I insulate and finish basement walls if they get damp?
- 3Is this mold or a water leak, and do I need to call someone?
- 3How to tell if mold is hiding after a roof leak
- 6How to find and handle hidden mold behind walls
- 2Why is there a wet spot on my wall every morning?