Cut and seal the plywood prepare a plywood board replacement.
How to repair bathroom wall water damage.
Seal the water damage go over the surface with a stiff nylon brush and shop vac to remove any loose particles.
Otherwise you can cut out and water damage repair the water stained portion.
Put some new drywall in place and attach it with drywall clips.
Then using a drywall saw cut along the line you just scored.
How to fix a water damaged plaster wall beside the bathtub.
Use a utility knife to score a line about 10 inches 25 cm long into your drywall at the location where you see visible signs of a water leak mold discolored drywall etc.
Before making a repair because of bathroom wall water damage it is important that you discover the source.
You may need to bring in a long line of contractors to get things back in order.
Water damage in the bathroom could be caused by something as simple as water spray from a shower head water seeping into faulty caulking around the tub or it could be something more serious like a leak in a pipe behind the bathroom wall.
Generally speaking if drywall has swelled or sagged 3 8 of an inch or more from the baseline then you need to replace the entire sheet.
Rarely water damage to a tile wall can be caused by leaking pipes within the wall.
In this instance the damage is usually confined to the wall where the showerhead and faucet is located and it may be found anywhere on the wall not just down near the base.
Add texture to match the wall if necessary.
Erasing signs of the damage in your bathroom is dependent on the severity of what s occurred.
Cut a hole in the wall large enough for your head to fit inside.
Measure and cut it to size.
This indicates a more serious plumbing problem that must be fixed before you repair.
A common problem in bathrooms is soft or damaged drywall where the wall meets the shower or tub particularly near the floor.
Wash the surrounding surfaces using a sponge and bucket of clean water to remove any residual lime deposits and let the wall dry completely before proceeding.
Paint the board with hydro stop waterproofing sealant and cover with a layer of cheesecloth.
If there is any damage to the drywall around the bottom of the floor you will need to repair it.