Paint blistering on the walls |
Moldy plywood (above left)
Fan not connected (above right) |
Mold-covered, warped plywood |
Water entry via diffusion |
Closeup of the new fan |
4" 'flapper' exhaust vents with
clamped connection tube |
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This repair job in Rock Creek demonstrates water 'diffusion,' the process in which water molecules pass through most materials, including concrete, lumber, plywood, sheetrock, etc. For 7 years, two bathroom fans caused diffusion by pumping moisture into the homeowner's attic, creating hundreds of gallons of moisture intrusion into the attic.
In this case, connection tubes from fans to vents existed, but were knocked down. The owner believes the insulation guys may have knocked down the connection tubes, and he just didn't notice (neither did they!).
Read more and view more photos in our Hall of Shame under "
Water Diffusion Problems."
