Why ESD Flooring Should Be Designed as a System — Not Selected by Resistance Value Alone
Data centres contain some of the most sensitive and valuable electronic infrastructure in a building. Servers, control electronics, UPS systems, switchgear, communication equipment and electronic components can all be exposed to electrostatic discharge (ESD).
An electrostatic charge can build up through normal activities such as walking, movement of equipment, clothing friction and contact between different materials. If that charge is suddenly discharged through sensitive electronic equipment, it can potentially contribute to equipment malfunction or damage.
For this reason, ESD flooring may form an important part of the electrostatic control strategy in selected areas of a data centre.
However, one of the most common specification mistakes is simply writing:
“Provide antistatic epoxy flooring.”
This is not sufficient.
Consultants should define the required electrical performance, grounding arrangement, flooring build-up, testing method, mechanical performance and operating conditions before selecting an ESD epoxy system.
At Topkrete, we recommend treating ESD flooring as a complete system:Floor finish + conductive network + grounding + footwear/personnel + testing + maintenance.
1. Does Every Data Centre Area Require ESD Epoxy?
Not necessarily.
ESD requirements should be determined according to the function and electrostatic risk of each space.
Areas that may require consideration include:
- Server and equipment rooms
- UPS rooms
- Battery-related technical rooms where appropriate
- Network and communication rooms
- Electronic repair areas
- Testing and maintenance rooms
- Control rooms
- Sensitive electronic assembly areas
- Equipment staging areas
- Certain electrical and instrumentation rooms
Other areas may require standard industrial epoxy, polyurethane flooring or another flooring system instead.
This distinction is important because ESD flooring is a specialised electrical-control flooring system, not simply a premium version of normal epoxy flooring.
IEC 61340-5-1:2024 provides requirements for an ESD control programme for protecting electronic devices from electrostatic phenomena.
2. Antistatic, Static-Dissipative and Conductive Are Not the Same
The term “antistatic” is often used loosely in construction specifications.
From a technical perspective, consultants should determine the actual electrical resistance required.
The EOS/ESD Association describes static-dissipative flooring as having resistance to ground greater than 1 × 10⁶ ohms and below 1 × 10⁹ ohms, while lower-resistance systems may fall within the conductive range.
The important point is:
Lower resistance does not automatically mean better flooring.
The correct electrical performance should be selected according to the facility’s ESD-control design.
A consultant should therefore avoid simply specifying:
“Resistance shall be as low as possible.”
Instead, specify the required performance range and verification method.
3. The Floor Alone Does Not Control ESD
This is one of the most important points for data centre designers.
An ESD epoxy floor does not operate independently.
A complete ESD-control pathway may involve:
Person
↓
ESD footwear
↓
ESD flooring
↓
Conductive layer / copper grounding network
↓
Building earth
The footwear-flooring combination is particularly important where personnel grounding relies upon people standing or walking on the ESD floor.
IEC 61340-4-5 specifically addresses test methods for evaluating the electrostatic protection provided by the combination of person, footwear and flooring.
The EOS/ESD Association also notes that when footwear/flooring is used as the personnel-grounding method, system resistance and walking body-voltage performance are important considerations.
Therefore:
Do not approve an ESD floor purely based on the resistance of the coating itself.
The complete installed system should be evaluated.
4. What Should Consultants Specify?
A good data centre ESD flooring specification should address several different performance parameters.
Electrical Resistance
The specification should define whether the floor is required to be:
- Conductive
- Static dissipative
- Or another project-specific ESD classification
The resistance should be measured using the relevant test procedure rather than relying only on manufacturer literature.
IEC 61340-4-1 provides test methods for measuring electrical resistance of floor coverings and installed floors, including resistance to ground and point-to-point resistance.
5. Resistance to Ground Is Critical
A conductive or static-dissipative topping cannot function correctly unless there is an effective electrical path to ground.
A typical ESD epoxy flooring build-up may therefore include:
Concrete substrate
↓
ESD-compatible primer
↓
Copper grounding tape/network
↓
Conductive layer
↓
ESD self-levelling epoxy topping
↓
Electrical connection to designated earth point
The final configuration depends on the selected system and project requirements.
The electrical engineer and flooring specialist should coordinate the grounding arrangement before installation begins.
6. Copper Tape Should Not Be Treated as a Decorative Detail
Copper tape is commonly incorporated into resin ESD flooring systems to establish continuity to grounding points.
However, simply installing random strips of copper tape does not guarantee satisfactory ESD performance.
The system designer should determine:
- Grounding-point locations
- Copper tape layout
- Connection between floor sections
- Maximum floor area served by each ground point
- Continuity between copper strips
- Interface with the electrical earthing system
- Testing requirements before and after topping installation
The grounding arrangement should preferably be coordinated between the electrical consultant, main contractor and specialist flooring applicator.
7. Select the Right Resin Flooring Technology
Electrical performance is only one part of product selection.
Data centre floors may also be exposed to:
- Continuous pedestrian traffic
- Equipment movement
- Server rack installation
- Trolleys
- Maintenance activity
- Cleaning chemicals
- Point loading
- Rolling loads
- Impact
- Occasional oil or chemical contamination
Therefore, the ESD flooring system must provide both:
Electrical performance
and
Mechanical performance
A technically compliant resistance value is of little benefit if the flooring cracks, delaminates or wears prematurely.
8. Why Self-Levelling ESD Epoxy Is Commonly Considered
For many technical areas, a self-levelling ESD epoxy system provides a smooth, seamless and easily cleaned finish.
Typical advantages can include:
- Seamless surface
- Controlled electrical properties
- Good abrasion resistance
- Good adhesion when properly installed
- Ease of cleaning
- Professional appearance
- Compatibility with grounding networks
- Ability to provide a relatively flat finished surface
For appropriate data centre areas, Topkrete Deckrete AS SL can be considered as part of an antistatic/ESD flooring system, subject to the electrical resistance, mechanical performance and testing requirements established for the project.
Product selection should always be based on the project’s approved technical data and test documentation rather than product name alone.
9. Recommended ESD Epoxy System Build-Up
A typical ESD self-levelling epoxy floor may consist of:
Step 1 — Concrete Substrate Preparation
Mechanical preparation by grinding or shot blasting to remove:
- Laitance
- Contamination
- Weak concrete
- Existing coatings
- Oil
- Loose material
The substrate must be strong, clean and suitable for resin flooring.
Step 2 — Epoxy Primer
A compatible primer is applied to promote adhesion between the concrete and subsequent flooring layers.
Substrate moisture should be checked before installation.
Excessive moisture can result in:
- Blistering
- Osmotic pressure
- Delamination
- Loss of adhesion
Moisture conditions should therefore be addressed before installation rather than after flooring failure occurs.
Step 3 — Copper Grounding Network
Copper tape or another approved conductive arrangement is installed according to the flooring manufacturer’s system design.
The copper network is connected to the designated earth points.
Step 4 — Conductive Layer
A conductive intermediate coating provides electrical continuity across the flooring area and towards the grounding network.
This layer is a critical component of many ESD epoxy systems.
Step 5 — ESD Self-Levelling Epoxy
The final ESD resin topping is applied at the specified thickness.
Depending on project requirements, a system such as:
TOPKRETE DECKRETE AS SL
may be considered.
Final thickness should be determined according to:
- Traffic
- Mechanical loading
- Substrate condition
- Required durability
- Electrical performance
- Manufacturer’s tested system
10. Do Not Modify the ESD System Without Verification
Ordinary epoxy flooring can often be adjusted in colour or finish relatively easily.
An ESD floor requires greater control.
Changes to:
- Resin formulation
- Conductive filler
- Pigment
- Layer thickness
- Primer
- Conductive layer
- Aggregate
- Topcoat
may affect electrical resistance.
Therefore, consultants should be cautious about allowing contractors to substitute individual components from different manufacturers.
For critical installations, the complete flooring system should preferably be supplied and tested as one compatible system.
11. ESD Flooring Colour Selection Requires Care
Architects naturally want flexibility in floor colour.
However, ESD resin systems may have greater colour limitations than normal decorative epoxy because conductive fillers and functional components can influence both appearance and electrical performance.
Consultants should therefore approve colour based on:
actual ESD product samples, not standard epoxy colour charts.
Aesthetic requirements should never compromise the required electrical performance.
12. Surface Flatness Matters in Data Centres
Data centres frequently contain:
- Server racks
- Heavy cabinets
- Mobile equipment
- Precision installations
- Raised access flooring
The concrete substrate should therefore be properly assessed before resin application.
Self-levelling epoxy can improve the finished surface, but it should not be expected to correct major structural irregularities or poor concrete tolerances.
Where high flatness is required, this should be addressed separately in the flooring specification.
13. Raised Access Floors Need a Different ESD Strategy
Many data centres use raised access floor panels rather than exposed epoxy throughout the server room.
In these cases, consultants should determine where ESD control is actually required.
Possible conditions include:
Exposed technical room floor
→ ESD epoxy may be appropriate.
Raised-floor server hall
→ ESD requirements may apply to the raised floor panel system and personnel-grounding strategy.
Below raised floor
→ Resin flooring may primarily require dustproofing, durability or other performance rather than being relied upon as the personnel ESD-control surface.
This should be established at design stage.
Do not automatically specify ESD epoxy underneath every raised access floor unless it forms part of the project’s ESD-control strategy.
14. Testing After Installation Is Essential
One of the biggest mistakes is approving ESD flooring based solely on the manufacturer’s product data sheet.
The installed floor should be tested.
IEC 61340-4-1 covers electrical resistance testing of floor coverings and installed floors.
Where the flooring/footwear system is being used for personnel grounding, the complete combination may also require evaluation according to the applicable ESD programme. IEC 61340-4-5 specifically covers testing of person-footwear-flooring combinations.
Consultants should consider requiring testing at multiple locations across the completed floor.
15. Recommended Inspection and Testing Sequence
For a critical data centre project, consider establishing inspection hold points.
Before installation
Check:
- Concrete strength
- Surface condition
- Moisture
- Cracks
- Contamination
- Floor level
- Earthing locations
During installation
Check:
- Surface preparation
- Primer
- Copper tape layout
- Conductive layer
- Connection to earth
- Material batch
- Mixing
- Thickness
After installation
Check:
- Appearance
- Thickness where required
- Adhesion
- Resistance to ground
- Point-to-point resistance where specified
- Grounding continuity
- Other project-specific ESD tests
Before handover
Provide:
- Test reports
- Product data sheets
- Installation records
- Material batch information
- Maintenance instructions
- As-built grounding layout
- Warranty documentation
16. A Better ESD Flooring Specification
Instead of writing:
“Provide 2 mm antistatic epoxy flooring.”
consultants should consider a performance-based description such as:
Provide and install a seamless self-levelling ESD epoxy flooring system comprising approved substrate preparation, compatible epoxy primer, copper grounding network connected to designated building earth points, conductive intermediate layer and ESD self-levelling epoxy topping at the specified thickness. The complete installed system shall achieve the electrical resistance and ESD-control performance stated in the project requirements and shall be tested using the applicable recognised test methods.
Then separately define:
- Required electrical resistance range
- Test standard
- Flooring thickness
- Grounding arrangement
- Number and location of test points
- Mechanical performance
- Chemical resistance where required
- Surface finish
- Colour
- Acceptance criteria
- Warranty
17. Common ESD Flooring Specification Mistakes
Mistake 1 — Specifying Only “Antistatic Epoxy”
There is no measurable acceptance criterion.
Better: Define the required electrical performance and test method.
Mistake 2 — Selecting the Lowest Resistance
Lower is not automatically better.
Better: Select resistance according to the overall ESD-control programme.
Mistake 3 — Ignoring Grounding
An ESD coating without an effective grounding pathway may not deliver the intended system performance.
Better: Coordinate flooring grounding with the electrical design.
Mistake 4 — Testing Only a Product Sample
Laboratory product performance does not automatically prove installed floor performance.
Better: Test the completed installation.
Mistake 5 — Ignoring Footwear
Where personnel grounding depends on a footwear/flooring system, the two need to function together.
Better: Evaluate the complete personnel-grounding strategy.
Mistake 6 — Choosing by Price Per Square Metre
Two quotations described as “ESD epoxy” may represent completely different systems.
One may include:
- Copper grounding network
- Conductive layer
- Tested ESD topping
- Installation testing
- Documentation
while another may simply provide an antistatic coating.
Compare systems, not only prices.
Product Selection Checklist for Consultants
Before approving an ESD epoxy flooring product, ask:
1. What resistance range is required?
2. Which test method will be used?
3. Is the value based on the product or the complete installed system?
4. Is a conductive intermediate layer required?
5. How is the flooring connected to earth?
6. What is the copper tape/grounding layout?
7. What flooring thickness is required?
8. What mechanical loads will the floor experience?
9. Will ESD footwear be used?
10. Who will test the installed floor?
11. What are the acceptance criteria?
12. What documentation is required at handover?
If these questions are unanswered, the ESD flooring specification is probably incomplete.
Topkrete ESD Flooring Solution for Data Centres
For suitable data centre and electronic environments, TOPKRETE DECKRETE AS SL may be specified as part of a complete ESD resin flooring system incorporating the appropriate:
- Surface preparation
- Primer
- Grounding arrangement
- Copper tape
- Conductive layer
- ESD self-levelling topping
- Testing and commissioning
The final system should always be selected according to the project’s required electrical classification, loading conditions and applicable ESD-control requirements.
Final Thought for Data Centre Consultants
For data centre flooring, asking:
“Which antistatic epoxy should we use?”
is not the first question.
The better questions are:
What electrostatic risk are we controlling?
What resistance and personnel-grounding performance are required?
How will the flooring be grounded?
How will the completed installation be tested?
Once those requirements are established, the correct flooring system can be selected.
Because in mission-critical facilities:
ESD flooring is not just a floor finish. It is part of the facility’s electrostatic-control system.
Need Technical Assistance for a Data Centre ESD Flooring Specification?
Topkrete can assist consultants, architects, engineers and contractors with:
- ESD flooring system selection
- Deckrete AS SL system recommendations
- ESD epoxy flooring specifications
- Grounding and copper tape detailing
- Conductive flooring build-up
- Resin flooring thickness selection
- Data centre flooring details
- Method statements
- Technical submissions
- Testing requirements
- Sample and mock-up recommendations
TOPKRETE — Engineered Flooring Solutions for Mission-Critical Environments.