It depends on the situation, and I will give you an honest answer. The EPA guidelines say that surface mold on non-porous materials covering less than 10 square feet can potentially be addressed by a homeowner with proper safety equipment. That is a narrow exception. The moment mold has penetrated a porous surface, grown into a wall cavity, or covers a significant area, DIY cleaning is not appropriate and attempting it creates serious risks.
Why DIY Usually Makes It Worse
The most common mistake homeowners make is scrubbing visible mold on a surface without understanding that disturbing a mold colony releases millions of spores into the air. Those spores travel through the home and land on other wet or humid surfaces. A problem that was contained to one wall can become distributed throughout the HVAC system and multiple rooms in the time it takes to scrub a surface. I have walked into homes where a homeowner's cleanup attempt made a manageable localized problem into a whole-house remediation job.
Bleach Does Not Kill Mold on Porous Surfaces
Bleach is a surface disinfectant. On non-porous surfaces like tile, it can kill surface mold effectively. On porous surfaces like drywall or wood, bleach does not penetrate deeply enough to reach mold that has grown into the material. The surface appears white and clean. The mold colony is still alive inside the material, and it will grow back. Professional remediation on porous materials means removing the material, not treating the surface.
When to Call a Professional
Call us any time mold is inside a wall, under flooring, in insulation, covers more than a small area on any surface, or involves any material that has been wet for more than 48 hours. We offer free inspections for property owners. Contact us before you start cleaning and we will tell you honestly whether professional remediation is warranted. See how professional mold removal works.
← Back to All FAQs