Mold remediation comparisons

DIY vs. professional. Under about 10 square feet on a hard, non-porous surface, with the leak already fixed, is a homeowner job. Above that, or inside ductwork, or after sewage exposure, the EPA points you to a contractor. The reason is not just scale — it is containment. Cutting into moldy drywall without isolating the room spreads spores through the house, which converts a small job into a large one.

Testing vs. remediation. These are different purchases and should usually be different companies. Testing before work, when mold is visible, is mostly wasted money by the EPA's own account. Testing after work, as post-remediation verification, is the one that protects you.

Removal vs. encapsulation. Encapsulation — sealing a treated surface with a coating — has legitimate uses on structural wood in crawl spaces and attics that cannot be replaced. It is not a substitute for removing moldy porous material, and a contractor offering to encapsulate instead of remove drywall is cutting the job short.

Bleach vs. detergent. The EPA's home guidance is to scrub hard surfaces with water and detergent and dry completely. Bleach is not required, does not penetrate porous materials, and should never be mixed with ammonia or other cleaners.

How to choose

Use the 10 sq ft line as a starting point, not a loophole

The EPA's threshold assumes a hard surface, a fixed leak, and no sewage. Any of those missing pushes you toward a pro.

Never buy testing and removal from the same firm

The party measuring the problem should not be paid by the size of the problem.

Removal beats coating on porous material

Encapsulation belongs on framing lumber, not on moldy drywall, carpet, or ceiling tile.

Skip fogging as a primary treatment

Dead mold is still mold. Physical removal plus drying is the standard of care under ANSI/IICRC S520.