Improper ventilation and insulation of home attic space can produce.
Ceiling no attic without drywall mold.
However if you find no end to the mold it is likely feeding on the drywall and the drywall needs to be removed completely.
Excess humidity can also cause mold growth on the ceiling even in a well insulated attic space.
The 3rd potential cause is ghosting which is not actually mold though it can look very similar.
It depends on how deep the mold has grown.
Next take a look at your attic.
The attic floor which is the ceiling of the living space below often already is insulated.
If it is and you plan to provide heating and cooling to the finished attic space you need to remove.
Purchase an inexpensive rh meter and monitor the humidity levels in the room.
That dark spot on your ceiling may be the result of more than just a ceiling water leak.
Condensation on your ceiling can cause water damage and promote the growth of mold or mildew.
But if after it dries the drywall feels loose or spongy to the touch it should be removed and patched in with a replacement piece of drywall.
Warm air escaping from a duct into a cold attic can create condensation and encourage mold growth.
Mold can grow anywhere that there was water damage meaning in your drywall insulation and even in your floorboards and ceiling beams.
Worries about the hot roof un vented cathedral ceiling designs how to.
Take care of your attic hvac air ducts too.
Applying mastic gum to the duct joints and adding an r6 layer of insulation around your sheet metal ducts goes a long way toward protecting your attic and ceiling.
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Under the right conditions mold can begin to grow in as little as 24 hours.
If you can use a wide spackling knife and scrape the paint and if no mold shows at the lower layer then you do not need to replace just clean off the mold.
How to fix ceiling condensation.
It s important to do a thorough inspection of the nearby area to determine if mold is present.
Suggestions for un vented or hard to vent building roof cavities.