When you have a ceiling water leak there is always the chance that the ceiling may fall due to the weight of the water and the loss of structural integrity in the ceiling material.
Ceiling no attic without drywall mold.
It depends on how deep the mold has grown.
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Take care of your attic hvac air ducts too.
That dark spot on your ceiling may be the result of more than just a ceiling water leak.
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.
Next take a look at your attic.
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.
Warm air escaping from a duct into a cold attic can create condensation and encourage mold growth.
Purchase an inexpensive rh meter and monitor the humidity levels in the room.
The 3rd potential cause is ghosting which is not actually mold though it can look very similar.
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How to fix ceiling condensation.
Closing in the ceiling too quickly may trap moisture that can foster the growth of mold and mildew.
However if you find no end to the mold it is likely feeding on the drywall and the drywall needs to be removed completely.
Under the right conditions mold can begin to grow in as little as 24 hours.
Mold can grow anywhere that there was water damage meaning in your drywall insulation and even in your floorboards and ceiling beams.
Water soaked drywall often will dry out fine if it gets proper ventilation.
The attic floor which is the ceiling of the living space below often already is insulated.
Excess humidity can also cause mold growth on the ceiling even in a well insulated attic space.
Improper ventilation and insulation of home attic space can produce.
If it is and you plan to provide heating and cooling to the finished attic space you need to remove.