An ESD epoxy floor only works if it is grounded. That is the part most facility managers do not expect. The resin itself is not what protects your equipment — it is the complete assembly of conductive primer, embedded copper grounding grid, conductive or dissipative resin layers, and physical connection to the building’s earth ground. Remove any one element and you have an ordinary epoxy floor that happens to cost more.
This article covers how an ESD flooring system is actually built, layer by layer, and how installers verify it performs before handing it over. If you want the broader picture of what ESD flooring is and which facilities need it, start with our guide to what ESD flooring is and when it is required.
The System, Layer by Layer
1. Substrate preparation
Mechanical preparation — diamond grinding or shot blasting — opens the concrete profile so the primer can key into sound material. This step matters more in an ESD installation than a standard one, because the conductive path depends on continuous, intimate contact between layers. A weak bond is not just an adhesion risk; it is an electrical discontinuity.
Moisture vapour emission testing happens here as well. Vapour pressure that lifts a coating destroys the conductive network along with the floor.
2. Conductive primer
A carbon-loaded or otherwise conductive primer goes down first. This layer forms the horizontal plane that collects static charge from across the entire floor area and moves it laterally toward the grounding points.
Coverage must be continuous. A gap in the primer is a dead zone where charge accumulates with nowhere to go.
3. Copper grounding grid
This is the element that makes the system a system. Adhesive-backed copper strips are laid across the primed floor in a grid pattern, typically running to the perimeter and connecting at designated points to the building’s earth ground.
Grid spacing depends on floor area and the target resistance. Larger spaces need more grounding points, not simply a longer perimeter run. The connections themselves are made by a qualified electrician — this is the point where flooring work and electrical work intersect, and it needs to be coordinated rather than assumed.
4. Conductive or dissipative body coat
The main resin layer carries conductive additives — carbon fibres, carbon black, or other conductive media — dispersed through the material so the electrical property runs through the full thickness rather than sitting on the surface.
Whether the system is specified as conductive or dissipative determines the additive loading. The two behave differently and suit different environments, which we cover in the two main types of ESD flooring.
5. Topcoat
A conductive topcoat provides the wear surface and final appearance while maintaining the electrical path. Standard non-conductive topcoats cannot be used — applying one over a correctly built ESD system insulates it and defeats the entire installation. This mistake happens more often than it should, usually during a later refresh by a contractor who was not told what the floor was.
Resistance Testing
An ESD floor is not finished when it looks finished. It is finished when it tests correctly.
Testing measures electrical resistance from the floor surface to ground, and between points on the floor surface. The acceptable range depends on the standard your facility works to and whether the system is specified as conductive or dissipative — conductive floors target a lower resistance range, dissipative floors a higher one.
Two points worth understanding:
Lower resistance is not automatically better. A floor that is too conductive can present its own hazard in some environments by discharging too rapidly. The specification defines a range, not a minimum.
Testing conditions affect results. Humidity influences readings, which is why testing follows a defined procedure rather than a casual spot check.
Ask for written test results at handover, recording readings at multiple locations. In a facility working to a formal static control programme, that documentation is part of your compliance record.
Where ESD Installations Go Wrong
The failures we are called to assess cluster around a few recurring issues:
- Insufficient grounding points — a grid sized by habit rather than by floor area leaves regions of the floor too far from a ground connection
- Grounding never connected — the copper grid is installed, the electrical connection is left for someone else, and nobody closes the loop
- Non-conductive topcoat applied later — a maintenance recoat with an ordinary product that insulates the system
- Discontinuous primer — thin or missed areas that break the conductive plane
- No handover testing — nobody knows whether the floor works until something fails
- Floor finishes applied in cleaning — waxes and polishes that insulate the surface
That last one is worth emphasising to facility staff. An ESD floor maintained with ordinary floor finish will stop performing while looking immaculate.
What to Ask a Contractor
- What resistance range is the system specified to, and to which standard?
- How is the grounding grid laid out, and how many connection points?
- Who makes the electrical connection, and is it included?
- Will resistance testing be performed at handover, with written results?
- What cleaning products and procedures preserve the electrical properties?
- What is the recoat procedure, and which topcoat must be used?
A contractor who cannot answer the grounding and testing questions specifically has installed an epoxy floor with conductive additive in it, which is not the same thing as an ESD system.
Installing in an Operating Facility
Most Toronto facilities needing ESD flooring cannot simply stop. Electronics manufacturing lines, data centres, and pharmaceutical production all run to schedules that make a long shutdown impractical.
Phased installation works, but it requires care at section boundaries — the grounding grid has to remain continuous across a joint between phases, or you end up with two partially grounded floors rather than one properly grounded one. This is a planning question, best resolved before the first section is prepared.
Getting It Specified Properly
Armour Guard has installed conductive and ESD flooring in Toronto for more than 30 years, in facilities where static control is a compliance requirement rather than a preference.
Contact our Toronto team to discuss your facility’s static control requirements and the system that meets them.