Mold Removal — Salt Lake City Source Removal Under IICRC S520
Mold removal is the physical act of taking mold-colonized materials out of a building. It is one specific phase inside the broader mold remediation process, and it is the phase most people mean when they call about “mold removal.” The technical work follows ANSI/IICRC S520 Section 12 acceptance criteria — contained work area, negative-pressure air control, wet-source removal to prevent airborne spore release, HEPA vacuuming of every remaining surface, and wet-wipe cleaning with EPA-registered antimicrobial. Vivid Water Damage & Restoration performs mold removal under IICRC Applied Microbial Remediation Technician (AMRT) certification and Utah DOPL general contractor license #10894576-5501.
Why “Source Removal” Matters More Than “Killing” the Mold
The industry-wide consensus and ANSI/IICRC S520 position is unambiguous: mold must be physically removed, not just killed. Bleach, hydrogen peroxide, and other biocides can kill viable mold spores on non-porous surfaces, but they do not remove the mycotoxins produced during growth, do not remove the settled spores that will re-germinate under favorable conditions, and do not penetrate porous materials where the colony has grown into the substrate. IICRC S520 Section 12.2.6 specifically warns against reliance on antimicrobial application without physical source removal: “killed” mold on drywall paper facing is still an allergen and mycotoxin source; only removal of the affected material addresses the actual exposure risk.
The Source Removal Process
Step 1 — Encapsulant Pre-Wet
Before any colonized material is disturbed, an encapsulant spray (typically Fiberlock IAQ 6100, Foster 40-20, or equivalent) is applied to the visible mold growth. The encapsulant wets and sticks the spore mass to the underlying substrate, preventing airborne spore release during physical removal. This is the single most important step in preventing cross-contamination of adjacent areas. Encapsulant application typically requires 15–30 minutes dwell time before removal begins.
Step 2 — Physical Removal
Colonized materials are removed intact where possible — entire drywall panels rather than cut-outs where feasible — to minimize the surface area exposed during removal. Materials commonly removed:
- Drywall — entire panel or panels showing visible colonization or paper-facing degradation. Cut lines extend 6–12 inches beyond visible growth to catch hyphae that may have grown into the paper facing.
- Insulation — fiberglass batt and cellulose blown-in adjacent to colonized surfaces. Loose-fill insulation contaminated with mold cannot be cleaned; full removal and replacement is standard.
- Wallpaper and wall coverings — entire runs where colonization is present on the substrate. Cellulose-based wallpaper is a mold food source and typically re-colonizes after remediation without removal.
- Carpet and pad — entire affected sections in Condition 3 areas. Carpet in Condition 2 (settled spores only) can sometimes be HEPA-vacuumed and treated in place.
- Cabinetry, shelving, and built-ins — particleboard and MDF components with visible colonization or paper-facing degradation. Solid wood components can sometimes be salvaged after surface sanding and HEPA vacuuming.
- Ceiling tiles — drop-ceiling acoustic tiles with visible colonization. Full-panel replacement is standard.
Removed materials are bagged in 6-mil polyethylene bags inside the containment, sealed, and transported through the airlock zipper to disposal. Standard mold-remediation waste goes to standard construction and demolition disposal (not hazardous waste, unlike Category 3 sewage waste), but disposal locations vary by scope and specific mold species involved.
Step 3 — HEPA Vacuuming
After source removal, every remaining surface within the containment is HEPA vacuumed. Standard shop-vacs, household vacuums, and central vacuum systems are not acceptable under IICRC S520; only true-HEPA vacuums rated to 99.97% capture at 0.3 microns qualify. HEPA vacuuming captures the settled spores that inevitably dispersed during physical removal, even with proper encapsulant pre-wet. Every surface is vacuumed: ceiling, walls, framing, subfloor, mechanical systems, and any contents remaining in the containment. Multi-pass vacuuming is standard on ceiling and wall surfaces where downward-settled spores accumulate on horizontal ledges (window sills, trim, cabinet tops).
Step 4 — Wet-Wipe Cleaning
After HEPA vacuuming, every non-porous surface within the containment is wet-wiped with an EPA-registered antimicrobial solution (Fiberlock ShockWave Concentrate, Benefect Botanical Decon 30, or equivalent under the appropriate product label). Wet-wiping physically removes any remaining spores that were not captured by vacuuming and applies antimicrobial to residual biological material. Dwell time is per product label (typically 10–30 minutes) before final wiping.
Step 5 — Second HEPA Vacuum Pass
After wet-wipe cleaning and dwell time, a second HEPA vacuum pass removes any residual moisture and any spores that dislodged during wet-wiping. This step is often skipped by less-thorough contractors but IICRC S520 Section 12 identifies it as recommended practice for high-thoroughness remediation.
Special Considerations by Material Type
Framing Lumber (Douglas Fir, Southern Yellow Pine)
Framing lumber with surface mold can typically be sanded and HEPA vacuumed rather than replaced, unless the colony has penetrated deeply into the wood. Sanding removes the top surface layer where hyphae have grown into the wood grain. Post-sanding surface treatment with borate solution (Bora-Care or equivalent) provides long-term fungicidal protection without leaving residue that would affect drywall or paint adherence during reconstruction.
Concrete and Masonry
Non-porous concrete and masonry can typically be cleaned in place without removal. Physical scrubbing with an antimicrobial solution followed by HEPA vacuuming and drying is the standard approach. Heavy colonization on porous concrete (older concrete with surface degradation) may require surface grinding to remove the compromised top layer.
Metal Framing and Ductwork
Steel framing, metal ductwork, and other non-porous metal surfaces are HEPA vacuumed and wet-wiped in place. HVAC ductwork with interior colonization typically requires professional duct cleaning through a specialized HVAC contractor before the HVAC system can be reintegrated.
Solid Wood Contents (Furniture, Cabinetry)
Solid hardwood contents with surface mold on non-porous finished surfaces can typically be HEPA vacuumed, wet-wiped, and salvaged. Wood contents with mold growth on unfinished porous surfaces (undersides of cabinets, back of dressers) may require sanding or professional wood restoration. Contents that cannot be effectively cleaned are documented, photographed, and disposed of; insurance carriers typically pay for contents replacement on covered claims.
Soft Contents (Upholstery, Bedding, Clothing)
Fabric contents that contacted mold colonies (bedding, clothing, upholstered furniture) typically require professional laundering with antimicrobial detergent or dry cleaning. Contents that cannot be effectively cleaned are disposed of. Books and paper documents in the affected area rarely survive Condition 3 mold events.
Post-Removal Verification
After source removal, HEPA vacuuming, and wet-wipe cleaning are complete, the containment is dried to indoor equilibrium moisture content using standard IICRC S500 psychrometric protocols. Post-remediation verification through independent industrial hygienist air sampling determines whether the removal was effective. Sampling protocol typically includes indoor spore samples inside the containment, adjacent-area samples for cross-contamination check, and outdoor reference samples for comparison. Standard clearance criteria: indoor spore counts below outdoor reference, no detectable Stachybotrys chartarum or Chaetomium globosum, and Aspergillus/Penicillium concentrations comparable to outdoor reference. Clearance results are documented in the project file and provided to the client and insurance carrier before reconstruction begins.
Frequently Asked Questions
- Can Vivid just spray something on the mold to kill it, without removing it?
- No, and no reputable IICRC-certified contractor will offer this. ANSI/IICRC S520 explicitly prohibits reliance on antimicrobial application without physical source removal. Bleach and other biocides may kill viable spores on non-porous surfaces, but they do not remove mycotoxins produced during growth, do not penetrate porous materials where the colony has grown into the substrate, and do not address the settled spores that will re-germinate under favorable conditions. Any contractor offering to “kill” mold with sprays instead of physical removal is either untrained in S520 protocols or knowingly cutting corners.
- Do I have to remove and replace all the drywall if there’s mold on part of it?
- Not necessarily. IICRC S520 does not require full-panel replacement in every case — the cut line extends 6–12 inches beyond visible growth to catch hyphae that may have grown into the paper facing, but a section can be removed while leaving adjacent unaffected drywall in place. The decision depends on the extent of colonization, the type of drywall (regular vs. moisture-resistant vs. mold-resistant), and the reconstruction efficiency of partial vs. full replacement. On smaller Condition 3 areas, partial replacement is common; on whole-wall colonization, full replacement is typically more efficient.
- Where does removed moldy material get disposed of?
- Standard mold-remediation waste (drywall, insulation, wallpaper, contents) is bagged in 6-mil polyethylene inside the containment, sealed, and transported to standard construction and demolition disposal facilities. Mold-contaminated waste is not classified as hazardous waste under EPA regulations, unlike Category 3 sewage waste. Salt Lake County construction waste facilities (Salt Lake Valley Landfill, Trans-Jordan Landfill) accept mold-remediation waste as C&D debris. Very small quantities can be disposed of through regular municipal waste service in sealed bags.
- Can I take pictures of the mold before Vivid removes it?
- Yes, and it’s actually recommended for the insurance claim file. Photograph the visible growth wide-angle and close-up before Vivid begins containment installation. Vivid takes its own photographic documentation for the technical file, but client-provided photographs from before the initial dispatch add value to the claim narrative. Do not disturb the growth to get better photographs — that risks airborne spore release without proper PPE.
- How long does the mold removal phase take?
- Depends on the affected area size and material types. Small Condition 3 areas (under 50 square feet): 1–2 days for containment installation, source removal, HEPA vacuuming, wet-wipe cleaning, and drying setup. Medium projects (50–200 square feet): 3–5 days. Large projects (whole-basement remediation, HVAC system decontamination): 5–10 days. Post-remediation verification adds 2–3 days for air sampling collection, laboratory analysis, and clearance documentation. Reconstruction begins after clearance is documented; total project timelines run 7–21+ days depending on scope.
Contact Vivid Water Damage & Restoration — Salt Lake County Emergency Response
Vivid Water Damage & Restoration answers mold remediation calls 24 hours a day, 7 days a week from our Fort Union office in Salt Lake City. Non-emergency mold assessments and inspections are scheduled during regular business hours.
- Emergency Line (24/7): (385) 289-3885
- Address: 7084 S 2300 E #170, Salt Lake City, UT 84121
- License: Utah DOPL general contractor license #10894576-5501
- Certifications: IICRC WRT, ASD, AMRT, HST, OCT; EPA Lead-Safe RRP
Office Hours
- Emergency Service: 24 hours a day, 7 days a week
- Office Staff: Monday – Saturday, 9:00 AM – 5:00 PM
- Closed: Sundays and major holidays (emergency line always active)