Water Damage to Drywall: What to Do in the First 24 Hours
Showcase Drywall · Eagle, Colorado · 26 years in the valley
If water has come through a ceiling or run down a wall, what you do in the first day decides whether this is a three day repair or a three week one. The short version: stop the water, get the air moving, open the wet material up rather than leaving it closed, and photograph everything before anything is cut.
This is written for homeowners in the Vail Valley, where the usual causes are a failed fitting in a heating system, a burst line in an unheated space, or an ice dam pushing melt under the roof edge. The sequence below is the same whatever the source.
Hour one: stop the water and kill the power
Shut off the supply. If the water is coming from plumbing or a heating line, close the valve. If you cannot find a local valve, use the main shutoff. Everyone in the house should know where that is before they need it.
Turn off power to the affected area. Water and electricity in the same ceiling cavity is the one genuine danger in this situation. If a ceiling is holding water above a light fitting, switch that circuit off at the panel before you touch anything.
Call the trade that owns the problem. A plumber for supply and heating lines, a roofer for a roof or ice dam. Nobody should be repairing drywall while water is still arriving.
Hour two: photograph before you touch anything
Take more photographs than you think you need, before any cleanup:
- The source, if it is visible
- The ceiling or wall from a distance, so the extent is clear
- Close-ups of staining, sagging and any dripping
- Standing water on floors, and any furniture or contents affected
- A shot with something for scale, a tape measure if you have one
Your insurer may need these, and they also help whoever quotes the repair. Once a wet ceiling has been cut out, nobody can prove what it looked like.
Hours two to six: relieve the weight and get air moving
Drain a bulging ceiling deliberately
A ceiling holding water will sag, and the instinct is to leave it alone. That is the wrong call. A sagging, saturated ceiling can come down in one piece, which turns a contained problem into a room full of wet gypsum.
If a ceiling is bulging and you are confident the power to that area is off, put a bucket underneath and make a small hole at the low point of the bulge with a screwdriver. The water drains in a controlled way. It feels wrong to make a hole in your own ceiling, and it is far better than the alternative.
Move what you can
Lift furniture off wet carpet, or put foil or plastic under the legs. Wooden furniture on wet carpet stains the carpet, and the carpet damages the furniture.
Start drying
Open windows if the outside air is dry, which in this climate it usually is. Run fans. A dehumidifier helps considerably in a closed room. The aim is to move air across the wet surfaces continuously, not to heat the room.
What you cannot do with fans alone is dry out what is behind the drywall. Air moving across a painted ceiling does very little for soaked insulation sitting above it. That is why the next step matters.
Hours six to twenty-four: open it up
This is the step most homeowners skip, and skipping it is what turns a repair into a mold problem.
Wet insulation holds water like a sponge and gives it back slowly into whatever is next to it. A closed ceiling cavity with wet batt insulation in it stays damp for weeks. Drywall that is sealed on both sides, painted below and insulated above, cannot dry from either direction.
So the affected material gets opened:
- 1. Cut out the obviously wet drywall. Back to sound, dry material, usually to the framing members either side.
- 2. Pull the wet insulation out. All of it that got wet, not just the worst of it. Compressed, soaked insulation has lost most of its thermal value anyway.
- 3. Look at the framing. Note anything stained, soft or mouldy. Photograph it.
- 4. Leave the cavity open to the air with fans running until it is dry. A moisture meter is the only way to be sure; by feel alone, the cavity is usually still damp when it seems dry.
In an occupied home, this is also the point to tent the area off with plastic so dust and debris stay in one room.
What not to do in the first 24 hours
Do not paint over the stain. Water stains bleed through ordinary paint, and painting a wet surface traps moisture under the film.
Do not patch the hole yet. Closing up a cavity that is still wet guarantees the job gets done twice.
Do not assume a small stain means small damage. Water runs along framing and insulation and appears a long way from where it got in. The stain shows where the water stopped, not where it started.
Do not throw out damaged material before the insurer has seen the photographs. Keep the record even if the material goes.
Do not run heat alone. Heating a closed, humid room without ventilation just moves the moisture around.
How to tell how bad it is
| What you see | What it usually means |
|---|---|
| Small round stain, ceiling firm, dry to the touch | A one-off drip. Seal the stain and repaint once you are sure it is dry |
| Large stain, firm board, no sag | Surface damage, but check the insulation above before closing anything |
| Ceiling sagging or soft underfoot of a hand | The board has failed. That section comes out |
| Stain that keeps growing | Water is still arriving. Back to step one |
| Musty smell after a few days | Moisture is still in the cavity. Open it up |
| Visible mould on board or framing | Remove the affected material and deal with the cause |
Insurance, briefly
Sudden and accidental water damage, such as a failed fitting or a burst line, is commonly covered by a homeowners policy. Damage from long-term seepage or deferred maintenance commonly is not. Your insurer makes that decision, not your contractor.
What helps: the photographs from hour two, a written scope of what was removed and replaced, and an invoice that matches that scope. We put the scope in writing as a matter of course.
Why mountain homes make this worse
Three things about houses in this valley change the calculation.
Unheated and partly heated spaces. Crawl spaces, garages, mechanical rooms and second homes left on low heat all freeze lines that would never freeze at lower altitude. A second home that nobody visits for three weeks in January is where the worst of these jobs come from, because the water runs the whole time.
Ice dams. Snow melts against a warm roof deck, runs to the cold eave, freezes, and backs water up under the shingles. The water appears inside at the top of an exterior wall or along a ceiling edge, usually well away from the actual roof defect.
Dry indoor air. Winter air in a heated mountain house is very dry, which helps a cavity dry out once it is open. It also means a wet cavity that is closed up looks and smells normal for longer than it should, because the surface dries while the insulation stays wet.
If the home is a rental or a second home, the practical advice is the same but the timing changes: the first 24 hours start whenever somebody finds it, so a property manager checking an empty house after a cold snap is doing real damage prevention.
When to call a drywall contractor rather than doing it yourself
Do it yourself if the damage is a small stain on a sound, dry ceiling in a room without much direct light, and you are confident the leak is fixed.
Call someone if any of these apply:
- The ceiling is sagging or soft
- Insulation got wet
- The affected area is larger than a couple of feet across
- The surface carries a texture that will need matching
- The room has tall windows or a vaulted ceiling, where a mismatched repair will show
- You are making an insurance claim and want the scope documented properly
What happens when we arrive
We find the full extent of the damage rather than working to the edge of the stain. The wet drywall comes out, the wet insulation comes out, and the cavity dries before anything closes it. Then new board goes in, gets taped and finished, the texture is matched and tested, and the full ceiling or wall is painted rather than the patch.
A home in Bear Paw, Beaver Creek lost a section of ceiling when a fitting in the hot water heating system let go. We cut out a four foot by four foot area, replaced the soaked insulation, hung new drywall, then finished, textured and repainted the ceiling. Four days, and no sign anything had happened.
In an occupied home we tent the work area, protect floors and furniture, and clean at the end of every day.
A short checklist for the first day
- 1. Stop the water. Close the valve, call the plumber or roofer.
- 2. Switch off power to the affected area.
- 3. Photograph everything before you move or cut anything.
- 4. Drain a bulging ceiling deliberately into a bucket.
- 5. Move furniture and lift what you can off wet flooring.
- 6. Fans on, windows open if the air outside is dry, dehumidifier if you have one.
- 7. Open up the wet material, pull out wet insulation, leave the cavity open.
- 8. Do not paint, do not patch, do not close anything up until it is dry.
- 9. Call a drywall contractor for a quote with the scope written down.
Questions about water damaged drywall
How long does drywall take to dry?
With the cavity open and air moving, usually two to four days. With the cavity closed, weeks, and sometimes it never fully dries before mould starts.
Can wet drywall be saved?
Sometimes. Drywall that got damp and dried quickly, with no sag and no softness, is often fine. Drywall that was saturated, that sagged, or that stayed wet for days has lost its strength and comes out.
Does the insulation really have to come out?
Yes, if it got wet. It holds water against the framing and the board, and it has lost its insulating value in any case.
Will the repair be invisible?
It should be. That depends on matching the texture and painting the full surface rather than the patch.
Should I get a mould test?
If the area was wet for more than a couple of days, or there is a musty smell, it is worth doing. Mould remediation is a separate trade from drywall, and the honest sequence is remediation first, repair afterwards.
If it has already happened
Stop the water, take the photographs, open the wet material up and get air into it. Those four things in the first day are most of what determines the size of the repair.
Showcase Drywall has been repairing water damaged ceilings and walls in Vail, Beaver Creek, Avon, Edwards, Eagle and Gypsum for 26 years. Call (970) 977-0247 for a free quote. If what you have is still wet, tell us when you call and we will tell you what to do before we get there.