Professional mold remediation follows a set process: inspect and find the moisture source, set up containment, run HEPA air filtration, remove contaminated porous materials, clean the remaining surfaces, dry the structure, and confirm the work is complete. The IICRC S520 standard lays out these steps so mold is removed and the moisture problem is fixed.
If you have just found mold in a finished basement in Windsor or behind a bathroom vanity in a north Loveland home, it helps to know what the job will look like before a crew shows up. Knowing the steps takes a lot of the stress out of it.
Our team works in homes all over Larimer and Weld counties, from older houses near Colorado State University in Fort Collins to newer builds in Timnath, Johnstown and west Greeley. The process below is the same one we follow in every one of them.
What is the difference between mold removal and mold remediation?
People use the two terms interchangeably, and that is fine in everyday talk. In the restoration world, remediation means the whole process: finding why the mold grew, containing it, removing affected materials, cleaning what can be saved, and drying the structure so it does not come back.
Mold spores exist naturally indoors and outdoors, so the goal is to bring the affected area back to a normal condition and remove the moisture that let growth take hold. That is why the EPA puts fixing the moisture source at the top of its guidance.
What are the steps of professional mold remediation?
Here is how a typical project runs, based on the IICRC S520 standard for mold remediation.
- Inspection and moisture mapping. Technicians look for visible growth, check for musty odors, and use moisture meters and thermal imaging to see how far water has traveled.
- Fixing the moisture source. A leaking supply line, a failed window well seal or a roof leak has to be repaired, or the mold will return.
- Containment. Plastic sheeting and zipper doors seal off the work area so disturbed spores and debris stay in that space instead of spreading through the house.
- Negative air and HEPA filtration. Air scrubbers with HEPA filters run during the work, and the contained area is kept under negative pressure so air flows in rather than out.
- Removal of contaminated porous materials. Drywall, insulation, carpet pad and similar materials with growth are cut out, bagged and removed.
- Cleaning. Framing, subfloor and other structural surfaces are cleaned, often with HEPA vacuuming and damp wiping, to remove growth and residue.
- Drying. Dehumidifiers and air movers bring the materials back to normal moisture levels before anything is closed up.
- Clearance and rebuild. The area is checked to confirm the work is complete, and then walls, flooring and finishes can be put back.
How long does each stage of mold remediation take?
Timing depends on the size of the area, what materials are involved, and how much drying is needed. This table shows what each stage is for, so you can understand why none of them should be skipped.
| Stage | Purpose | What you will notice at home |
|---|---|---|
| Inspection | Find all affected areas and the water source | Technicians with meters and a camera checking walls and floors |
| Containment | Keep spores and dust inside the work zone | Plastic walls, zipper doors, covered vents |
| HEPA filtration | Capture airborne particles during work | Air scrubbers running, often with ducting out a window |
| Removal and cleaning | Take out damaged porous materials and clean the structure | Cut drywall, removed pad or insulation, bagged debris |
| Drying | Return materials to normal moisture levels | Dehumidifiers and air movers running for a period of days |
| Clearance | Confirm the area is ready to rebuild | Final checks before walls and floors go back |
How do Northern Colorado basements and older homes change the process?
Basements are a big part of mold work in our market. Many homes in Fort Collins, Loveland and Greeley have them, and a lot of those basements were finished years after the house was built. That often means carpet laid over concrete, drywall close to the slab, and storage packed against exterior walls.
When mold shows up in a finished basement, containment matters even more. The furnace and ductwork are usually down there too, so technicians take care to seal off returns and vents so the system does not pull dust through the rest of the house.
Older homes bring a few other considerations. Houses in established neighborhoods near Old Town Fort Collins or downtown Loveland may have plaster walls, older framing and additions built in different eras. Some still use swamp coolers, which can leak into attics and ceilings over time. Each of these can change where crews look and what needs to be removed.
Our dry Front Range climate helps with the drying stage once the source is fixed. It can also hide the problem early, because surfaces dry fast while moisture stays trapped in wall cavities and under flooring. That is why moisture mapping comes first, before any demolition.
Can I stay in my home during mold remediation?
In many cases, yes. Because the work area is sealed off with containment and kept under negative air pressure, the rest of the home can usually stay in use. Your project manager will tell you which rooms to avoid and whether any systems, such as the HVAC, need to be off during certain stages.
It helps to clear a path to the work area, move valuables and fragile items out of the way, and keep pets away from containment walls and equipment.
Why not just clean mold myself?
The EPA notes that small areas can often be handled by a homeowner, but areas larger than about 10 square feet generally call for professional help. Size is only part of it. Mold on the surface often means more growth on the back side of drywall or under flooring, and scrubbing or disturbing it without containment can spread spores and debris to other rooms.
If you clean a spot and it keeps coming back, that is a strong sign the moisture source has not been found yet.
Frequently Asked Questions
What does IICRC S520 mean? It is the industry standard for professional mold remediation. It covers inspection, containment, HEPA air filtration, removal of contaminated porous materials, cleaning, drying and clearance.
Will all of my drywall need to be removed? Not usually. Technicians remove drywall and other porous materials that have growth or cannot be dried, then clean and keep what can be saved. Moisture mapping helps limit removal to the areas that need it.
Does painting over mold fix the problem? No. Paint covers the stain, but the growth and moisture behind it remain. The source has to be fixed and the affected material cleaned or removed.
How do I prepare for a mold remediation visit? Clear access to the affected area, take photos of the damage, and document everything for your insurance company. Keep kids and pets away from the work zone once containment is up.
Finding mold in your home is stressful, but a clear process makes it manageable. Our IICRC-certified technicians follow the IICRC S520 standard for Mold Remediation and Removal, from containment through drying and clearance, so you know the job is done right. Call Best Option Restoration of Fort Collins 24/7.