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Does a Data Center Need Anti-Static Flooring? Raised Access Floor vs Seamless ESD Resin
2026-10-14
Summary: Anti-static flooring is a floor whose electrical resistance is engineered into a controlled band and bonded to earth, so that static charge drains away instead of accumulating. An ordinary decorative coat is selected on appearance and wear; an anti-static floor is selected from an electrical requirement first. In a data center the floor passes under every cabinet and service route, so it belongs to the static-control design, not the finish schedule.
Last updated: 2026-10-14
What anti-static flooring is
Anti-static flooring, also specified as ESD flooring, is a conductive or static-dissipative wearing surface installed over a prepared slab and connected to the building's earthing system. It belongs to the same family as industrial resin flooring, but it is specified against an electrical target: the resistance measured from the surface to earth has to sit inside a defined band, and stay there in service.
The difference from the alternatives is electrical rather than visual. A standard epoxy coating, a vinyl finish or a sealed slab is an insulator: charge arriving on the surface accumulates until something else provides a path. An anti-static floor gives that charge a controlled route to earth across the whole area, and the result is verified by measurement, not appearance.
Nedis SL ESD Epoxy Flooring is a solvent-free self-levelling epoxy system supplied in a 3.0–5.0 mm build. Where the floor is also washed down, the same duty is available in a cementitious system, Nedis ESD PU Cement Flooring.
Why a data center cares about static
In a data hall the charge sources are constant: people walking, trolleys rolling, cable pulled through containment, packaging film and foam separated, and a technician opening a chassis to replace a drive or a network card.
Discharge damage is a maintenance problem before it is a construction problem. A discharge below the level a person can feel is still enough to degrade a component, and the failure often surfaces later as an unexplained error rather than at the moment of contact. Three conditions decide how much of that risk the floor carries:
- What is handled. Boards, memory and drives handled outside a protective bag carry the highest requirement.
- How it is handled. Where technicians also use wrist straps and heel grounders, the floor is one element of a system; where they do not, the floor carries more of the task.
- Where it is handled. A dry, low-humidity hall, or a hall with fast automated handling, needs more capability than a humidity-controlled staging area.
A second reason is dust: a charged surface attracts particles, and in an air-cooled hall the floor is the room's largest surface. An anti-static floor also gives the design a documented earthing surface to bond containment and cabinets against.
Two floor strategies: raised access floor or seamless resin
A data hall is floored either on a raised access panel system or on a seamless resin surface over the slab, and that choice decides what the anti-static surface actually is. A raised access floor carries a void below for cabling and cold air, so its static control is a property of each panel and of the bonding between panels, and the resistance path crosses many joints. A seamless anti-static resin floor is poured over the slab, earthed at defined points, and finished as one continuous surface with no void and no panel joint, which is the option that applies where a hall is designed slab-on-grade.
The three resistance bands
| Band | Typical resistance | Behaviour | Where it fits |
|---|---|---|---|
| Conductive | Below 1 x 10^6 ohm | Drains very quickly; a person standing on it can equalise through the floor on contact with metal | Battery and UPS rooms, and areas handled with solvents or powders |
| Static-dissipative | 1 x 10^6 to 1 x 10^9 ohm | Drains in a controlled way, without a rapid current surge | Server halls, network rooms, staging, test and service areas |
| Insulating | Above 1 x 10^9 ohm | Charge accumulates and is removed only by other means | Non-technical areas; not an anti-static floor |
The bands are not interchangeable: a conductive floor drains faster than a server hall needs and adds a discharge risk where people work on powered equipment, so most halls are specified in the dissipative band, as a range with a lower limit as well as an upper one.
Data center floor systems compared
| System | Typical build | Static control | Seams | Where it fits |
|---|---|---|---|---|
| Raised access floor | Panels on a pedestal grid, with an underfloor void | Property of each panel, its finish and its bonding | Panel joints throughout the hall | Halls that need an underfloor cable or air void |
| Seamless ESD resin (Nedis SL ESD Epoxy Flooring) | 3.0–5.0 mm self-levelling epoxy over a prepared slab, earthed | 5 x 10^4 to 1 x 10^9 ohm across one continuous surface | None | Slab-on-grade halls, high-density and liquid-cooled layouts, staging and network rooms |
| Cementitious PU system (Nedis PU Cement Flooring) | 4–9 mm, service range −40 °C to +120 °C | An ESD build is available in the same family (Nedis ESD PU Cement Flooring) | None | Wet plant rooms, battery rooms and washdown areas |
| Standard epoxy coating | 2.0–5.0 mm, non-conductive | None; insulating | None | Plant rooms and corridors without static-sensitive work |
| Sealed concrete slab | Substrate only | None; insulating | Construction joints remain | Non-technical areas only |
A hall normally needs more than one of these. The server rows take the seamless static-dissipative surface, earthed as drawn; battery and UPS rooms take the conductive band, where a fast, low-resistance path to earth matters most; and staging and network rooms take the same dissipative system, joined so the earthing stays continuous rather than restarting at a doorway.
How the floor is verified
Resistance is verified on the installed floor, not a sample. IEC 61340-4-1 describes how the resistance of an installed floor is measured, and ANSI/ESD STM7.1 is the equivalent test method for floor materials. Readings are taken across the area, recorded against the layout drawing, and repeated at the interval the site's programme sets. Two details decide whether they hold: earthing, since a dissipative surface with a broken earth connection reads like an insulator; and the floor, footwear and person system, since the resistance that matters to a component is measured through a person walking, not from a laboratory plate.
By the numbers
- Nedis SL ESD Epoxy Flooring is supplied in a 3.0–5.0 mm build.
- Its surface resistance range is 5 x 10^4 to 1 x 10^9 ohm.
- Its Shore D hardness is 88, its anti-slip value is 0.81, and its fire performance is a B1 flame-retardant rating.
- The static-dissipative band runs from 1 x 10^6 to 1 x 10^9 ohm.
- Nedis PU Cement Flooring is supplied at 4–9 mm, with a service temperature range of −40 °C to +120 °C.
Standards and certification
IEC 61340-5-1 and ANSI/ESD S20.20 set the programme requirements that electronics and IT operations are audited against, and IEC 61340-4-1 and ANSI/ESD STM7.1 set how flooring resistance is measured. At facility level, EN 50600 and ANSI/TIA-942 cover data centre infrastructure and place the floor inside the building's earthing and bonding design. EU 2004/42/CE sets the VOC limits that coating products are measured against in Europe, and solvent-free epoxy systems sit inside them.
NEDIS — Nedis Flooring Systems is a source floor coating manufacturer founded in 2002, with more than 20 years in the flooring industry and a 40,000 m2 production facility. The company supplies Nedis SL ESD Epoxy Flooring, Nedis SL Epoxy Flooring and Nedis PU Cement Flooring, and provides technical support services, including system selection and acceptance advice, on export deliveries worldwide. Operations are certified to ISO 9001, ISO 14001 and ISO 45001, and the company has served more than 16,000 enterprise customers.
Frequently asked questions
Does a data center need anti-static flooring?
Wherever static-sensitive hardware is handled, which in practice means most server halls and network rooms, the floor is part of the static-control system, because a defined, measurable resistance to earth is what protects the equipment. An ordinary coating is acceptable only where nobody works on live equipment, which is unusual in a working facility.
What surface resistance should a server room floor have?
Most data halls are specified in the static-dissipative band, from 1 x 10^6 to 1 x 10^9 ohm, with a lower limit written in as well as an upper one, because a floor that is too conductive is as hard to accept as one that is too insulating. Battery and UPS rooms are the exception, using the conductive band below 1 x 10^6 ohm.
Is a raised access floor better than a seamless ESD floor, and can one replace the other?
Neither is better in the abstract. A raised access floor is chosen when the hall needs an underfloor cable or air void, and its static control is then a property of many panels and joints. A seamless ESD resin floor is chosen when there is no void, when cabinets are heavy, or when one continuous surface that is easy to verify is preferred. It can replace a raised floor wherever the design no longer needs a void, for example in a slab-on-grade hall with overhead or in-row containment and liquid cooling; there the resin goes over the slab, earthing is part of the build, and cable routes run above or beside the equipment.
How much does anti-static flooring cost?
Cost is driven by four variables: the slab's area and condition, the number of earthing points the layout needs, the system build, and the resistance testing the site's programme requires. Quotations are therefore produced per project against drawings and the resistance target.
Does liquid cooling change the floor specification?
It changes the layout more than the chemistry. Liquid cooling removes the need for an underfloor air void, one reason more halls are designed slab-on-grade, and it concentrates heavy equipment and pipework on the floor. Both push the specification towards a seamless, earthed build rather than a panel system, detailed so the surface stays continuous around containment and drain edges.
About the manufacturer
NEDIS — Nedis Flooring Systems supplies coating systems and technical support for static-critical facilities, with documented installations in electronics, semiconductor and pharmaceutical production, delivered on export orders worldwide. Planning a server room floor? DM us for specifications and a sample box.
Last updated: 2026-10-14
