Why shouldn't a water-stained ceiling just be painted over?
Paint seals moisture into the drywall or plaster and hides the stain without drying the material. The water can then grow mold and soften the ceiling further, so the ceiling should be dried and checked before any paint goes on.
A stain painted over looks finished, but the material behind the paint may still be wet. Moisture trapped in drywall paper and plaster can support mold and can weaken the bond between the finish and the framing. Once the ceiling is closed up with that moisture inside, the problem continues where the homeowner cannot see it.
The crew dries the ceiling and its cavity and takes readings until the materials reach their dry level. Only then is the finish repaired and painted, by a drywall or plaster person, on a ceiling that is known to be dry.
When does a wet ceiling need to be opened?
A ceiling needs to be opened when the drywall or plaster is still wet, soft or sagging, and cannot be dried in place. The opening is made at the points the readings show, and kept as small as the job allows.
Some ceilings can be dried without opening. A stain that is dry to the touch, with readings that fall as the room dries, may not need an opening. Where the readings stay high, or where the drywall is soft, the crew opens the ceiling so the cavity can be reached.
Openings are placed where the readings are highest, and each is photographed and recorded. The crew explains each one to the owner, and the openings are closed and finished once the drying is complete.
Is a sagging ceiling dangerous?
A sagging ceiling can fall without warning, so the room under it should be kept clear. The crew secures the area and checks the framing before anyone works beneath it, and it notes any structural concern for a qualified professional.
Drywall and plaster lose strength when they soak, and a ceiling that bulges or dips can give way. A sag that grows over a few hours or a crack that opens along a joist is a sign to keep out of the room and call for a visit.
The crew supports or removes the sagging section where it is safe to do so. It records the framing it can see and recommends a structural check where the sag suggests the joists or the framing have been weakened.
How long does a ceiling take to dry?
The drying time depends on the material, the amount of water and the cavity above the ceiling. The crew takes readings at each visit, and the drying continues until the readings show the ceiling has reached its dry level.
A drywall ceiling with a small stain dries faster than plaster on lath with water in the cavity. The air in the room, the temperature and the equipment set up for the job all shape the time needed, and the crew adjusts the equipment as the readings change.
The owner receives the readings and a note on when the ceiling is ready to close. The finish is not repaired until the readings show the material is dry, so the repair does not seal in moisture.
What moves the cost of ceiling water damage?
The size of the ceiling, the number of openings needed, whether the material is drywall or plaster, and the amount of cavity drying all change the scope. The price is explained and approved on site before any work starts, and no figure is given here.
A small stain on one flat ceiling is a smaller job than a sagging ceiling that spans a room. Plaster on lath takes longer to open and close than drywall, and a ceiling with a decorative finish or a popcorn texture needs extra care when it is opened.
Finish repair, painting and any structural check are separate jobs carried out by the people who do that work. The crew explains what it has dried and what remains, and it confirms the price for its own work on site before any equipment is set up.
