Decontamination units (decon units) are specialized three-chamber systems that provide controlled worker egress from asbestos work areas while preventing fiber contamination to clean areas. Required by OSHA and industry standards for all asbestos abatement projects, decon units consist of three sequential chambers: the equipment room (workers remove gross contamination and disposable suits), the shower room (workers thoroughly wash with HEPA-filtered water to remove any remaining fibers), and the clean room (workers dress in street clothes). The units create a critical contamination barrier between the regulated asbestos work area and uncontaminated spaces. Properly designed decon units maintain negative air pressure relationships, preventing airborne fibers from escaping through air locks and doorways. Industrial-grade decon units feature reinforced polyethylene construction, non-slip flooring, adequate lighting, heating/cooling for worker comfort, waste water containment systems, and supply storage for clean clothing and PPE. Units must be sized appropriately for project workforce—inadequate decon facilities create bottlenecks that compromise safety and productivity. The equipment room includes bench seating, boot wash stations, and containers for contaminated PPE disposal. Shower rooms must provide adequate water pressure, temperature control, and privacy. Clean rooms provide changing areas, benches, and storage for street clothes. Decon procedures are critical worker safety protocols—proper setup, maintenance, and use prevent take-home contamination that could expose workers' families. Abatement contractors are responsible for daily cleaning, maintenance, and monitoring of decon units throughout project duration.
Enter your location to find certified professionals offering this service in your area
No professionals found for this service yet.
The three-chamber system provides progressive decontamination that effectively removes asbestos fibers before workers enter clean areas. In the equipment room, workers remove contaminated outer clothing and perform initial cleaning, removing the bulk of fiber contamination. The shower room provides thorough washing with soap and water, removing any remaining fibers from skin and hair. The clean room is a uncontaminated space where workers dress in street clothes without risk of fiber contact. This staged approach is far more effective than single-step decontamination. Attempting to skip chambers or combine functions compromises worker safety and violates OSHA requirements. Each chamber serves a specific decontamination purpose that cannot be eliminated.
Decon unit size depends on workforce size and shift patterns. OSHA requires that units be appropriately sized to prevent delays that might discourage workers from using facilities properly. A general guideline is 1 shower station per 5-7 workers on shift, with adequate space in equipment and clean rooms for simultaneous occupancy. Small residential projects with 2-4 workers may use compact portable units. Large commercial projects with 20+ workers require multi-station custom-built decon systems. Each chamber should provide minimum dimensions: equipment room 6x8 feet, shower room 3x4 feet per station, clean room 6x8 feet. Undersized units create bottlenecks during shift changes, tempting workers to rush through decontamination or bypass procedures—a serious safety violation.
Daily decon maintenance is critical for safe operation. Workers must clean and disinfect all surfaces daily, remove and properly dispose of contaminated materials, refill soap and supplies, inspect for damage or leaks, verify adequate water pressure and temperature, check lighting and heating/cooling systems, and maintain waste water containment. The equipment room requires frequent cleaning as it accumulates significant contamination. Shower areas must remain sanitary and functional. Clean rooms must be kept uncontaminated—any fiber intrusion requires immediate cleaning. Air locks and doorways should be inspected for seal integrity. Project managers should verify decon maintenance during daily site visits. Neglected decon units become contaminated, defeating their protective purpose and violating safety standards.
No, all workers exiting the regulated asbestos work area must use the full three-chamber decontamination procedure every time—no exceptions. This is a strict OSHA requirement and fundamental safety practice. Skipping or rushing through decontamination risks take-home contamination that can expose workers' families to asbestos fibers. Contaminated workers entering clean areas spread fibers throughout the building, creating serious exposure hazards. Contractors must enforce decontamination compliance through training, supervision, and disciplinary measures. Projects should be scheduled with adequate time for proper decontamination, including shift changes and emergencies. The only acceptable deviation is emergency egress for serious injury—in such cases, emergency responders must use appropriate PPE and the area must be decontaminated immediately.
Shower waste water from decon units contains asbestos fibers and must be managed appropriately. Many decon systems include waste water collection tanks that allow fibers to settle. The settled material is disposed of as asbestos waste, while clarified water may be discharged to sanitary sewers per local regulations (many jurisdictions allow this as fiber concentrations are low and municipal treatment plants are designed to handle such discharge). Alternatively, some systems discharge directly to sanitary sewers with in-line filters to capture fibers. Discharge to storm drains is prohibited as it releases fibers to the environment. For sites without sewer access, waste water must be collected, treated if required, and disposed of through approved methods. Contractors should verify local discharge requirements before project start.
Get free quotes from certified professionals in your area