Drywall is a porous material with a paper coating on both sides making it prone to mold. Mold especially occurs in moist environments that encourage the growth of spores, and it can cause serious health issues. You will usually notice a musty smell and patches of white, black or green, fuzz if mold is present. You should be able to remove moderate amounts of mold by following these directions:
Prepare to Remove the Mold
To clean mold, gather:
- disposable work gloves
- HEPA respirator
- spray bottle
- utility knife
- plastic covers
- plastic bags
- wet/dry vacuum
- sponges or old tooth brushes
- baking soda, vinegar, and borax
- drywall compound (optional)
- paint brush (optional)
- stain blocking paint (optional)
Locate the source of the moisture, which could be a leaky pipe or roof, and get if fixed. Run a couple of fans to ventilate, but don't point the fan directly at the molded wall, or you will spread the mold.
If possible, open a window, and place a fan in it pointed outward. Seal the bottom of doors and air vents with plastic to avoid spreading spores.
Apply a Cleaner
Borax has more pH than vinegar or bleach, and it is much safer than using bleach, which only removes surface mold. Bleach doesn't usually work on mold because it can grow to the thickness of tree roots.
Use the wet/dry vacuum to absorb moisture and remove as much mold as possible. Mix a borax cleaner from one cup of borax per each gallon of warm water in a bucket, dip a sponge or old tooth brush in the mixture, and scrub.
Dab the solution on the mold, but don't rinse. If the drywall section is very wet, you will need to outline the shape, and cut it out with a utility knife, and discard it in a plastic bag.
For a non-chemical cleaner, mix baking soda in some water, and scrub in the same manner. Another natural mold killer is vinegar, which has more cleaning power than baking soda. Pour some in a spray bottle, and mist it on the mold, then scrub.
Replace the Drywall
If you had to cut the drywall, measure and mark a piece of replacement drywall slightly larger than the damaged area. Clean the inside of the drywall cavity.
Patch stains on painted drywall with a stain blocking paint in a matching color, and apply elastomeric paint to the inside of the wall cavity. Insert drywall screws on the patch using the screwdriver, spread on the drywall compound, then let it dry.
Contact a company like Colfax Corporation for more information and assistance.