How to Cut Out Wet Drywall After a Flood or Leak

A step-by-step guide to removing water-damaged drywall and insulation yourself: the gear and tools to buy, how high to cut, how to dry the wall, and when to stop and call a pro.

By Patrick & Dylan · Florida Certified General Contractor, Lic. #CGC1541672

When water soaks a wall, the wet drywall and insulation usually have to come out so the studs can dry. A muck-and-gut guide from the nonprofit SBP, posted by Charlotte County, Florida, walks volunteers and homeowners through exactly this. This guide covers what to buy, each step with pictures, how to know the wall is dry, and the points where you should stop and call a pro.

Stop and call a pro before you start if:

The home was built before 1978. It may have lead-based paint. The EPA recommends testing first, or hiring a lead-safe certified contractor.
You suspect asbestos. The EPA says there's no way to know if wall materials contain asbestos without testing. Have suspect material tested before you disturb it.
Mold covers more than about 10 square feet. The EPA says you can usually handle mold under about 10 square feet yourself; for more than that, it points to its professional remediation guidance. Our advice: call a professional for mold over about 10 square feet. Florida's mold-licensing law exempts homeowners working on their own home (s. 468.841).
The water was floodwater or sewage. The EPA says to call in a professional experienced with contaminated water, and not to run fans until you know the water was clean. If you do the work yourself, wear full protective gear the entire time.
Water reached outlets or the panel and the power is still on. The CDC says never to switch power while standing in water; call a licensed electrical contractor.
The ceiling is sagging or the home looks structurally damaged. The CDC says to stay out until a building inspector checks it.

What you'll need

Person wearing a protective suit, goggles, respirator and gloves — The muck-and-gut guide calls for full protective gear the whole time you're inside.

Safety gear (from the SBP / Charlotte County muck-and-gut guide)

Item	Why	Where to buy
P-100 respirator	Filters dust and mold spores	Home Depot · Lowe's
Safety goggles	Keeps debris out of your eyes	Home Depot · Lowe's
Nitrile gloves, with leather work gloves over them	Protects skin from contaminated water and sharp edges	Home Depot · Lowe's
Disposable coveralls (Tyvek-type suit) and boots	Keeps spores and insulation off your skin and clothes	Home Depot · Lowe's
Hard hat	Falling drywall and tools	Home Depot · Lowe's

Hammer, drill and screwdriver laid out on a white surface — Basic hand tools do most of the work.

Tools and supplies

Item	Why	Where to buy
Utility knife and extra blades	Scoring and cutting drywall	Home Depot · Lowe's
Pry bar and hammer	Pulling baseboard, trim and drywall	Home Depot · Lowe's
Tape measure and marker	Marking the cut line	Home Depot · Lowe's
Contractor trash bags	Wet insulation and debris	Home Depot · Lowe's
Wood moisture meter	Knowing when the studs are dry	Home Depot · Lowe's
Fans and a dehumidifier	Drying the open wall	Home Depot · Lowe's

Texas A&M AgriLife notes you can often borrow or rent a moisture meter from a hardware store or lumberyard instead of buying one.

Step by step

Step 1: Shut off power, gas and water

The muck-and-gut guide says to shut off electricity at the breaker box or outside panel, shut off gas, and consider shutting off water at the meter so a pipe you nick during demolition doesn't make things worse. Only touch the panel from a dry spot.

Step 2: Photograph everything first

Before anything comes out, take wide video of each room and close-ups of every wet wall, the water line and damaged belongings. Both the muck-and-gut guide and the City of Pinellas Park encourage owners to photograph damage before repairs begin.

Step 3: Put on your gear

Gloves (nitrile under leather), goggles, respirator, coveralls and boots, on before you go in and kept on while you're inside. Add a hard hat while you're removing drywall. Take breaks and drink water; the guide warns about heat exhaustion.

Step 4: Pull baseboard, door trim and casings

Wedge a pry bar behind the trim and work along it. Watch for exposed nails, and set aside any trim you plan to reuse.

Worker in a hard hat and respirator measuring along a wall with a tape measure — Measure up from the floor to your cut height and mark a straight, level line around the room.

Step 5: Find the water line and mark your cut

The muck-and-gut guide says to remove drywall at least 2 feet above the water line, and if the home flooded less than 4 feet, to remove 4 feet of drywall. If the drywall is still damp above your line, cut higher. Measure up from the floor and mark a line all the way around the room.

Exposed electrical wiring in an unfinished white wall — Wires and pipes run inside the wall. Cut shallow so you only go through the drywall.

Step 6: Score and cut along the line

Score along your line with the utility knife, cutting only as deep as the drywall. Don't plunge a saw blade into the wall: wires, pipes and outlet boxes run between the studs. Work around outlets and switches; leave the boxes and wiring for an electrician to check.

Step 7: Pull the drywall off and look for mold

Break the drywall below the line free with your hands or the pry bar. The muck-and-gut guide says that once it's off, check how far mold has spread, and if it's higher than the water line, remove more.

Step 8: Remove the wet insulation

Pull it out and bag it in contractor bags. Mississippi State Extension says wet insulation usually has to be removed, because it blocks airflow and keeps the framing from drying. Insulation irritates skin, eyes and throat, so keep your gear on.

Step 9: Pull every nail and screw

The muck-and-gut guide says to remove all nails and screws from the exposed framing, which makes mold treatment easier and safer.

Step 10: Dry the wall out

Room with exposed wall framing during renovation — Open framing has to dry to under 15% moisture before anything covers it.

If the water was floodwater or sewage, the EPA says not to run fans until you know the water was clean; that's a job for a pro experienced with contaminated water. For clean-water leaks, Texas A&M AgriLife's drying guidance:

Fans: point them across wet surfaces and into corners. A fan in a window blowing outward, with the gaps sealed, pulls air through the house.
Dehumidifier: use one when outside air is too humid, and close up the house while it runs. At 80°F and 60% humidity, most units pull about 1 to 2 pints of water an hour.
Test before you close it up: the wood should read under 15% moisture on a moisture meter before insulation or drywall goes back on. That can take weeks; walls may need to stay open for up to a month.

Step 11: Handle the debris

The muck-and-gut guide says to separate debris by type and keep drywall and insulation in their own pile at the curb. Check your city's storm debris pickup rules.

How long it takes

Plan around the drying: Texas A&M AgriLife says it can take weeks for the framing to be dry enough to close the wall, and up to a month. Don't rush the rebuild; closing up wet studs traps moisture inside the wall.

Stop and call a pro if, once the wall is open, you find:

Mold spreading well beyond the water line, or more than about 10 square feet of it.
Soft, rotted or cracked studs or bottom plates.
Damaged wiring, outlet boxes that held water, or anything electrical you're unsure about.
Moisture readings still above 15% after a month of drying.

When the framing is dry, the rebuild (new insulation, drywall, finishing and trim, with any required permits) is where we come in. See our hurricane and storm damage repair page or what to do in the first 48 hours after water gets inside.

Frequently asked questions

How high above the water line should I cut drywall?

The SBP / Charlotte County muck-and-gut guide says at least 2 feet above the water line, and 4 feet of drywall if the flooding was under 4 feet. Cut higher if the drywall is still damp above your line.

Can I just let wet drywall dry in place?

Only after a clean-water leak. The EPA says drywall can be dried in place if there's no obvious swelling and the seams are intact. Drywall soaked by floodwater should come out: Mississippi State Extension says submerged drywall must be replaced, and Texas A&M AgriLife says to discard flooded drywall.

How dry does the wood need to be before I put drywall back?

Texas A&M AgriLife says under 15% moisture content, measured with a wood moisture meter.

Do I need a permit to tear out wet drywall?

It depends on your city. In Pinellas Park, for example, the post-storm plan generally lets owners remove wet drywall and insulation without a permit unless the Building Official decides otherwise. Repairs to flood-damaged structures, and drywall replacement that's part of substantial repairs, need one. Check with your building department.

Sources

General information, not legal, insurance or engineering advice. Rules change and vary by city; confirm with your building department, DBPR, your insurer, an attorney or an engineer as fits.

How to cut out wet drywall and insulation after a flood or leak