Module 4: Identification and Risks of Asbestos in Data Centers
Learning Objectives
By the end of this module, learners will be able to:
Identify where asbestos-containing materials (ACMs) are commonly found in data center environments
Recognize potential asbestos hazards during routine cleaning and maintenance tasks
Understand the risks associated with disturbing asbestos materials
Apply the "presumption rule" when encountering suspect materials
Follow safe work practices to prevent fiber release
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4.1 Introduction: The Hidden Hazard in Data Centers
Why Data Centers Are at Risk
Data centers are often located in older buildings where asbestos was commonly used in fireproofing, insulation, and floor tiles . The technical infrastructure of data centers—particularly raised floors and suspended ceilings for cabling—creates environments where asbestos materials can be disturbed during maintenance and cleaning activities .
A documented case highlights the real danger: Mervon Jessop, 72, worked at a Barclays Bank data center in Gloucester, UK, for approximately 12 years starting in 1978. He spent time in the Barnwood Gloucester Data Centre, which had raised floors and suspended ceilings for data center cabling. When cables were pulled through the ceiling, it would disturb the tiling and debris, which he suspects contained asbestos. Jessop was later diagnosed with mesothelioma, a terminal lung cancer associated with asbestos exposure .
Helen Tomlin, a specialist asbestos-related disease lawyer, noted: "While many people often associate asbestos with heavy industry, its use was a lot more widespread" . This statement underscores that data centers—often perceived as modern, clean environments—can harbor legacy asbestos risks.
The Financial and Operational Impact
The risks of asbestos in data centers extend beyond health concerns. In Cayuga County, New York, a data center located in the basement of an office building had to be relocated after testing confirmed the presence of asbestos . The county noted that the location of the data center posed "a potential risk of contamination to high-value IT infrastructure" and that "a significant threat to the integrity and functionality of county technology assets exists" . The total expected cost of relocating the county data center was approximately $343,000 . This case demonstrates that asbestos is not just a health hazard but also a significant operational and financial risk.
Even major technology companies face this challenge. When Amazon retrofitted an existing industrial building into a data center in Clinton, Mississippi, the project included addressing asbestos and mold as part of necessary upgrades . This shows that asbestos management is a standard requirement even for major new data center developments.
4.2 Common Asbestos-Containing Materials in Data Centers
Categories of Asbestos-Containing Materials
Asbestos was used in over 3,000 different products across various industries. In data centers, ACMs can be found in both structural elements and building services. Asbestos is most dangerous when it is deteriorating, damaged, or disturbed .
4.2.1 Thermal System Insulation (TSI)
Description: Thermal system insulation includes materials used to insulate pipes, boilers, ducts, and HVAC equipment.
Common Locations in Data Centers:
Pipe lagging on heating and cooling systems
Insulation on boiler pipes and pressure vessels
Duct insulation in air handling units
Insulation around chilled water pipes
Gaskets and sealants on flanges and valves
Risk Level: HIGH - Friable materials that readily release fibers when disturbed.
Data Center Relevance: Data centers have extensive HVAC and cooling systems. Maintenance work on these systems can disturb insulation. Even routine cleaning near pipes with damaged lagging can release fibers.
Real-World Example: A data center asbestos register documented mastic material on air conditioning ductwork throughout ceiling cavities, which tested negative for asbestos, but other materials in the same facility tested positive for chrysotile (white asbestos) . This highlights that materials in the same data center may have varying asbestos content and must be tested individually.
4.2.2 Sprayed-On Fireproofing
Description: Sprayed-on fireproofing was applied to structural steel beams, columns, and ceilings to provide fire resistance.
Common Locations in Data Centers:
Structural steel beams and columns
Ceilings in mechanical rooms
Firewalls and fire barriers
Risk Level: VERY HIGH - Highly friable material that releases fibers easily with minimal disturbance.
Data Center Relevance: Data centers require fire protection, making spray-on fireproofing common. Cleaning staff working near structural steel or in ceiling voids could disturb these materials.
4.2.3 Ceiling Tiles and Textured Coatings
Description: Suspended ceiling tiles and textured ceiling coatings often contained asbestos for fire resistance and acoustic properties.
Common Locations in Data Centers:
Suspended ceilings above server floors
Acoustic ceiling tiles in office areas
Textured coatings (e.g., Artex) on ceilings
Ceiling voids where cables are routed
Risk Level: MEDIUM - Can be friable; disturbance risk increases with age, water damage, or physical impact.
Data Center Relevance: Data centers have extensive suspended ceilings for cabling. When cables are pulled through ceiling voids, it disturbs tiling and debris . This activity was specifically linked to a mesothelioma case at a Barclays Bank data center .
4.2.4 Floor Tiles and Mastics
Description: Vinyl-asbestos floor tiles (VAT) and the adhesives (mastics) used to secure them.
Common Locations in Data Centers:
Raised flooring systems
Sub-floors beneath raised floors
Computer room floors
Storage and plant rooms
Risk Level: LOW to MEDIUM - Non-friable when intact; becomes hazardous when damaged, sanded, or broken.
Data Center Relevance: Data centers often have raised floors for cabling and cooling. Cleaning staff may need to lift floor tiles for access, potentially damaging tiles or disturbing dust beneath the raised floor.
4.2.5 Fire Doors and Fire Breaks
Description: Fire-resistant doors and barriers containing asbestos in core materials or seals.
Common Locations in Data Centers:
Fire doors entering server rooms
Fire breaks between fire compartments
Fire-rated partitions
Risk Level: MEDIUM - Becomes hazardous when drilled, sanded, or damaged.
Data Center Relevance: Data centers require fire-rated compartmentalization. Drilling or altering fire doors for cable penetration can release asbestos fibers.
4.2.6 Asbestos-Containing Dust and Debris
Description: Settled dust that may contain asbestos fibers from deteriorating ACMs.
Common Locations in Data Centers:
Ceiling voids and suspended ceiling tiles
Below raised floors
Inside HVAC systems and ductwork
On top of server racks and equipment
On floors and surfaces in older areas
Risk Level: HIGH - Dust containing asbestos fibers is easily re-suspended during cleaning activities.
Data Center Relevance: Asbestos fibers can accumulate in inaccessible areas and be disturbed during cleaning. This is a particular concern for data center cleaning staff who may be unaware of accumulated dust hazards.
4.3 Identifying Potential Hazards in Data Centers
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The "Suspect Material" Rule
All suspect materials should be presumed to contain asbestos until sampled by an accredited inspector and analyzed by an accredited laboratory. This conservative approach ensures worker safety and prevents accidental disturbance.
Key Indicators that a Material May Contain Asbestos:
Building constructed or renovated before the year 2000
Material has a fibrous or fluffy appearance
Material is labeled with asbestos warnings
Material is in areas where asbestos was commonly used (pipe insulation, ceiling tiles, floor tiles, fireproofing)
Known ACMs are documented in the asbestos register
High-Risk Areas in Data Centers
Based on known asbestos applications in commercial and institutional buildings, data center cleaning staff may encounter asbestos in the following areas:
Ceiling Voids
Why It's High Risk: Data centers have extensive suspended ceilings for cable routing. When cables are pulled through ceiling voids, it disturbs tiling and debris . Asbestos from ceiling tiles, fireproofing, and pipe insulation can accumulate here.
Activities That Disturb: Cable pulling, lighting maintenance, ceiling tile removal, cleaning in ceiling voids, installing new equipment.
Raised Floor Plenums
Why It's High Risk: The raised floor area contains cabling and cooling systems. Old floor tiles and mastics may contain asbestos. Dust and debris from deteriorating ACMs can accumulate in the plenum.
Activities That Disturb: Lifting floor tiles for cable installation, vacuuming below raised floors, cleaning sub-floor areas, installing new equipment.
Mechanical and Plant Rooms
Why It's High Risk: These areas contain pipe insulation, boiler insulation, and HVAC components with high asbestos content. Materials here are often aged and deteriorating.
Activities That Disturb: HVAC maintenance, pipe work, cleaning, accessing valves and flanges.
HVAC Systems
Why It's High Risk: Duct insulation, gaskets, and seals may contain asbestos. Where ACM is located in an air plenum, fibers can be transported by the HVAC system throughout the building .
Activities That Disturb: Filter changes, duct cleaning, maintenance on air handling units, installing new cabling through duct spaces.
4.4 Disturbance Risks in Data Centers
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How Asbestos Fibers Are Released
Asbestos fibers are only released into the air when asbestos-containing materials are disturbed, damaged, or deteriorate over time . Intact and undisturbed asbestos materials do not pose a significant health risk.
Mechanisms of Fiber Release:
Mechanical Disturbance: Physical impact, cutting, drilling, sanding, or breaking ACMs releases fibers
Deterioration: Water damage, aging, and vibration cause materials to break down
Cleaning Activities: Vacuuming, sweeping, or dry wiping can re-suspend settled dust containing asbestos fibers
Air Movement: HVAC systems can spread fibers from damaged ACMs throughout the building
Risk Categories for Maintenance Activities
The EPA categorizes maintenance activities based on the likelihood of disturbing asbestos-containing materials :
High-Risk Cleaning Activities
Vacuuming Without HEPA Filtration
Regular vacuums do not capture asbestos fibers; they exhaust them back into the air. Only HEPA-filtered vacuums should be used in areas with potential asbestos contamination.
Dry Sweeping or Dusting
Dry sweeping or dusting re-suspends settled asbestos fibers into the air. Wet methods or HEPA vacuuming should be used instead .
Lifting Ceiling Tiles
Ceiling tiles may contain asbestos or have accumulated asbestos dust on their surfaces. Lifting tiles can dislodge fibers.
Cleaning Below Raised Floors
The sub-floor area may contain asbestos dust from deteriorating materials. Cleaning activities can re-suspend these fibers.
Wiping Surfaces
If dust containing asbestos fibers has settled on equipment, wiping with a dry cloth will re-suspend fibers.
4.5 Hierarchy of Risk and Control Measures
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The Risk Assessment Process
When asbestos has been found, the next step is to perform a risk assessment. This helps determine:
If there is a risk workers could be exposed to airborne asbestos
Whether any effective control measures are in place
What actions can be taken to control the risk
How urgently action should be taken
The Hierarchy of Controls
The hierarchy of controls ranks types of control methods from the highest level of protection and reliability to the lowest. The aim is to eliminate the hazard, which is the most effective control .
Work Practice Controls for Data Center Cleaning
Pre-Work Approval
If accidental disturbance is possible or intended, pre-work approval from the Asbestos Program Manager is required .
Area Isolation
Where disturbance is intended or likely, the area should be contained using drop cloths, mini-enclosures, or full containment . Signs should be posted at every entrance to warn unauthorized personnel .
HVAC System Control
If asbestos fibers could enter the HVAC system, the system should be modified to prevent fiber entry or shut down and sealed off .
Wet Methods
Applying water to ACM with a low-pressure sprayer can suppress fibers . However, high-pressure water spray should never be used on asbestos as it can destroy the binding matrix and spread contamination .
HEPA Vacuuming
Only HEPA-filtered vacuums should be used in areas with potential asbestos contamination .
Respiratory Protection
Workers need respiratory protection when disturbance is possible or intended . Workers wearing respirators should be medically qualified, fit-tested, and trained in their use .
Protective Clothing
Disposable coveralls prevent workers' regular clothing from becoming contaminated. Contaminated clothing should not be taken home to avoid creating a possible risk to the worker's family members .
4.6 Emergency Procedures for Accidental Disturbance
Actions to Take Immediately
If an asbestos-containing material is accidentally disturbed:
Stop work immediately
Evacuate the area
Prevent others from entering - post warning signs at every entrance
Report the incident to supervisor/asbestos program manager immediately
Do not attempt to clean up the material unless trained and equipped to do so
For Major Fiber Releases
EPA defines a "major fiber release" as involving more than three square or linear feet of ACM . For major releases:
The area should be isolated by closing doors and/or erecting temporary barriers
The HVAC system should be shut down and sealed off if fibers could enter it
Thorough cleanup procedures with final clearance air monitoring should verify satisfactory cleanup
For Minor Fiber Releases
For smaller releases (three square/linear feet or less), HEPA vacuuming, wet wiping, and proper waste containment in labeled, leak-tight containers are appropriate .
Never use regular vacuums, sweep with dry brooms, or use compressed air to clean asbestos dust.
4.7 The Role of Asbestos Surveys and Registers
Management Surveys
A management survey identifies ACMs that could be disturbed during normal activities, maintenance, or by occupants. This is the baseline survey most data centers require . The survey includes:
Bulk sampling of suspect materials
Laboratory analysis (typically using polarized light microscopy)
Documentation of location, quantity, and condition of ACMs
Refurbishment and Demolition Surveys
Before any refurbishment or demolition work, a fully intrusive survey is required to find all asbestos in the areas where work will take place . Data center cleaning staff should be aware that any major renovation requires this type of survey.
Accessing the Asbestos Register
Data center cleaning personnel should:
Request to see the asbestos register before beginning work
Review the location and condition of ACMs in their work areas
Report any discrepancies or materials not listed in the register
If in doubt about the possibility of disturbing ACM during maintenance activities, adequate precautions should be taken to minimize fiber release .
4.8 Key Takeaways for Data Center Cleaning Personnel
Know where asbestos is likely to be: Thermal system insulation, sprayed fireproofing, ceiling tiles, floor tiles, fire doors, and settled dust in ceiling voids and below raised floors are common ACM locations in data centers.
Follow the "suspect material" rule: If you cannot confirm a material is asbestos-free, treat it as asbestos.
Be aware of disturbance risks: Even routine cleaning can disturb asbestos if staff are not aware of where it may be located.
Use proper cleaning techniques: Use wet methods and HEPA vacuums. Never use dry brooms or regular vacuums.
Know the emergency procedures: Stop work, evacuate, post signs, and report immediately if you disturb suspect material.
Check the asbestos register: Before starting work, review the register for the data center to know where ACMs are located.
Use appropriate PPE: Wear respiratory protection and protective clothing when working in areas with potential asbestos risk.
Report concerns: If you encounter material that appears to be damaged ACM or is not listed in the register, report it immediately.
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