Why is there condensation and damp spots on walls only on laundry days?
Unvented indoor drying releases enough moisture to cause localized condensation and damp patches in specific rooms. This traps excess humidity against cold surfaces, preventing normal evaporation until the washing cycle stops and the space dries out over the next day.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Calling a plumber or professional to inspect the walls and find potential leaks
- 2Checking if there is an issue with the dryer vent or ducting inside the wall
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“Moisture coming through wall on laundry day?”source ↗
“the biggest clue is that we primarily notice the damp spots on laundry days, when we’re washing and drying several loads throughout the day.”source ↗
“the spots also seem to follow a pretty consistent pattern: they become damp while we’re doing laundry, then dry out by the following day once we’re done.”source ↗
Where this came up
People with this problem also raised
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- 7Why is my AC not lowering indoor humidity?
- 2Why is my ductwork dripping condensation inside the walls?
- 2Can you use fiberglass insulation in a basement after flooding?