Found these strange bubbles forming under the paint on my wall near the floor. They feel soft to the touch and seem to be getting bigger—is this a reaction to humidity or something worse?
Rising damp occurs when moisture from the ground rises through the walls by capillary action. This is especially common in older buildings without a proper damp-proof membrane. Look for a tide mark on the lower part of the wall, salt deposits, or a musty smell, which are telltale signs of rising damp.
Measuring the moisture content at different heights of the wall using a moisture meter can confirm rising damp, with higher moisture content closer to the floor.
6. Other Sneaky Causes: Poor Prep, Old Paint, And Vapor Barriers
Improper surface preparation before painting can lead to poor adhesion and subsequent bubbling. This includes failing to clean the surface, not allowing it to dry completely, or applying paint in unsuitable conditions.
Using old paint or low-quality paint can also result in bubbles, as can the presence of vapor barriers on the warm side of wall insulation, which can trap moisture and cause it to condense.
7. Quick Tests You Can Do Today To Track Down The Moisture
Perform a simple moisture test by taping a piece of aluminum foil to the wall where the bubbles are present. Leave it for 24 hours, then check for condensation. If moisture is present on the wall side of the foil, it indicates a problem within the wall.
Additionally, inspect nearby plumbing fixtures for leaks and check your roof and gutters for signs of water ingress. Using a moisture meter to check the wall’s moisture content can also provide valuable insights.
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