Indoor Humidity
Understanding moisture and mold in apartments
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About Us
We share clear, practical insights on indoor humidity and mold in apartments to help you understand what’s normal, recognize common problems, and manage your living space more comfortably.
Humidity Basics
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Why Storm Windows Are Safer Than Full Window Replacement for Old-House Condensation
Replacing the windows in an old house to stop condensation is one of those fixes that sounds logical until you…
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The Vapor Barrier Renovation Dilemma: When Adding One to an Old Home Backfires
A vapor barrier installed in an old home can create more moisture damage than the home ever had without one.…
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Why Insulating an Old House Can Cause Mold That Wasn’t There Before
Adding insulation to an old house doesn’t cause mold — stopping the house from breathing does. That’s the distinction almost…
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Why Mobile Home Walls Feel Damp Even With the AC Running
Your AC is running, the vents are blowing cold air, and yet the walls still feel like the inside of…
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Best Dehumidifiers for Mobile Homes and Manufactured Housing
Sixty percent of mobile home owners who buy a dehumidifier buy the wrong one — not the wrong brand, but…
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How to Ventilate a Mobile Home to Stop Trapped Humidity
Replacing the roof vents won’t fix trapped humidity in a mobile home — and neither will running a dehumidifier 24/7.…
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Why Manufactured Home Ductwork Sweats and Causes Hidden Mold
Ductwork condensation in manufactured homes isn’t a ventilation problem — it’s a physics problem disguised as one. Most guides tell…
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Where Should the Vapor Barrier Go in a Manufactured Home? It Depends on Your Climate
The vapor barrier goes on the warm side of the insulation — but “warm side” flips completely depending on where…
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Moisture Problems Under a Mobile Home: Skirting, Ventilation and Vapor Barriers
Under a mobile home, ground moisture doesn’t just sit there — it moves upward, and almost nothing stops it unless…
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Why Mobile Homes Get Moldy Faster Than Site-Built Houses
A mobile home can develop visible mold colonies within 72 hours of a moisture event — a leaking roof, a…
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Is Mold Worse at Night? And What Time of Year Is Mold Risk Highest?
Mold doesn’t actually “activate” at night — it grows whenever conditions are right, around the clock, without any awareness of…
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At What Humidity Does Mold Grow? Full Threshold Guide (30–80% RH)
60% relative humidity is the number you’ll see cited everywhere — but mold doesn’t actually wait for you to hit…
Gallery
Visual examples of common indoor humidity and mold situations in apartments.
