Find The Root Cause
One common problem that requires drywall repair is caused by moisture from a leaky roof or plumbing pipe. When drywall absorbs moisture it becomes heavy and causes taped seams to crack. If left untreated it can create mold growth that will stain beyond the moisture stain.
It is our policy to not perform any drywall repairs for moisture related problems prior to the moisture problem being addressed. If moisture has damaged plaster, we recommend that you hire a drywall contractor to remove all plaster and replace it with drywall.
If drywall damage is due to structural issues, we recommend that you hire a carpenter to address the structural damage.