Signs of a Humid Room

Digital Image

Digital Image

Digital Image

Digital Image

Digital Image

Digital Image


The Great Enemy of wallpaper is humidity. That is why some papers are not a good choice in some bathrooms. I particularly dislike solid-vinyl material on a paper backing, as they tend to absorb moisture and expand and curl and delaminate (vinyl detaches from the paper backing). You can see this happening in the top two photos.

The third photo is harder to see, but it is a shot of where I have removed the light fixture and you see the electrical box where the wires are connected inside the wall. Humidity has caused the screws on either side to rust and corrode. And the strap is completely rusted. (A strap is the metal bar that crosses the box and to which the light fixture is attached via a threaded nipple. In this picture, the screw on the right has been removed and the strap is the dark metal bar in a vertical position.)

What is intriguing is that humidity is present not just in the bathroom itself, which would be attributed to hot showers and poor ventilation, but also behind the wallpaper and inside the wall, sufficient enough to cause rusting inside the electrical box.

This is a 1930’s era home that was constructed with shiplap wood and lathe and plaster. It has been updated with modern air conditioning, but still has the original walls and wiring, and ventilation is probably not as adequate as it should be. There is no vent exhaust fan in this bathroom, either, so humidity from a hot shower would just hang out in the room until it dissipates over time.

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