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Skylight Drip

When condensation rains down, check the fan

Q:

I have Andersen double-pane skylights recessed about five feet into
my vaulted ceilings. When the evening temperature falls below 40
degrees, we get condensation that drips onto the furniture below. I have
tried running the ceiling fan all night but it does not seem to pull the
air from the recesses. I am thinking of drilling some small holes into
the attic area to allow the hot moist air to escape the recesses that
the skylight is in. Will this solve the problem, or is there a better
solution?

— Rick, Niles, Ohio

A:

Tom Silva replies: You're running the fan to pull air out, but you should try
reversing the fan to push air in, creating cross-ventilation that will
keep moisture from forming. Drilling holes into the attic is not a good
idea, because that will trap all the warm air in the house and create a
potential moisture and mildew problem up there. Above all, make sure
your skylight is tightly closed. I knew a guy who owned a condo in Acton
with electric heat. He couldn't get the bathrooms warm at all and bought
two portable heaters to add heat in those rooms. His electric bill was
costing him a fortune. He lived there for eight years before we
discovered that the two bathroom skylights were in vent mode —letting all the heat right out the ceiling.

 
 

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