Renovating Older Buildings:

Renovating an older home or commercial building is an exciting process of transformation, but it often reveals a “Pandora’s box” of hidden issues. One of the most common—and hazardous—surprises encountered during a “gut-reno” is the discovery of dormant mold spores hidden behind decades-old drywall, wallpaper, and flooring. For contractors and DIYers, understanding how to manage these “legacy spores” is critical for the safety of the workers and the future health of the building.

The Dormancy Myth: Why Old Mold is Still Dangerous

Many people assume that if mold is “old and dry,” it is no longer a threat. This is a dangerous misconception. Mold spores are incredibly resilient; they can enter a state of dormancy and survive for decades in a dry environment.

The moment you begin a demolition—tearing down plaster or ripping up old carpets—you “aerosolize” these dormant spores. They become airborne by the billions, settling into the new HVAC system, the new insulation, and the lungs of anyone on the job site. Furthermore, once the renovation is complete and the new “wet” materials are introduced (such as new plumbing, drywall mud, or fresh paint), that moisture can “wake up” the dormant spores, leading to an immediate outbreak in a brand-new space.

The Post-Demolition “Clean Slate”

In a high-quality renovation, the period after demolition and before the “re-build” is the most critical time for mold prevention. This is when the “skeleton” of the building is exposed.

Using the PCG Professional Suite during this phase is a best practice for “Healthy Building” standards:

1. Preparation: Use ProClean+ to lift and remove any visible legacy mold from the original studs and masonry. This ensures you aren’t just “painting over” a problem.

2. Fortification: Apply FortiCel PRT (Post-Remediation Treatment) to every exposed structural member.

By treating the original 1950s or 1890s lumber with a modern inorganic coating, you are essentially “upgrading” the biological resilience of the antique wood. This ensures that the history of the building stays, but the mold of the past does not return.

Liability Protection for Contractors

For renovation contractors, “mold callbacks” are a profit killer. If a client finds mold in their newly renovated kitchen six months after the project is done, the contractor is usually the first person they call—and the first person they blame.

By documenting the application of a PCG coating and providing the client with a 25-year warranty, the contractor shifts the liability. It proves that the “due diligence” was done and that the building was handed over in a fortified state. It’s a professional insurance policy that protects your reputation and your bottom line.

Renovation Best Practices:

• IAQ Monitoring: Use air scrubbers during demolition to manage aerosolized spores.

• Structural Coating: Never close a wall without treating the “hidden” framing.

• Documentation: Provide the 25-year warranty to the owner as part of the “Close-Out” package.