ESD Flooring Compliance & Testing Standards

How We Address It

When the facility program, specification, and executed scope require S20.20 compliance, that standard governs the ESD flooring work we perform. Our material selection, grounding design, and testing protocols follow the applicable S20.20 requirements from the start. The flooring system remains one component of the facility’s broader ESD control program, not a standalone compliance program.

We verify compliance through the specific test methods S20.20 references: STM 7.1 for floor resistance, STM 97.1 for floor-footwear-person system resistance, and STM 97.2 for walking body voltage. Each method is run with calibrated instrumentation and the electrode configurations it specifies. Reports identify the method, test conditions, applicable acceptance limits, and whether the measurements support qualification, installed-floor acceptance, or periodic verification.

Qualification, acceptance, and periodic verification are separate jobs. Qualification shows a footwear and flooring combination meets the S20.20 limits before first use; acceptance testing checks the installed floor at turnover; periodic compliance verification follows the facility’s plan. S20.20-2021 requires that plan to set how often each item is tested but supplies no numerical floor-retest interval, and ESD TR53-01-22 provides the verification procedures.

Our closeout documentation package is structured as an S20.20 compliance record. It gives your ESD coordinator the evidence to demonstrate that the flooring component of the program meets the standard’s requirements, in internal audits and customer audits alike.

How We Address It

IEC 61340-5-1 is technically equivalent to S20.20, not identical to it. It cites IEC test methods and uses its own structure and terminology, so the editions named in the specification decide which requirements, methods, and records apply. We have experience delivering documentation packages that satisfy both standards at once.

Specifications that call for IEC 61340-5-1 compliance get test procedures, a reporting format, and compliance verification documentation matched to that standard’s terminology and structure. Where a specification names both standards, the combined report has to demonstrate each standard’s requirements.

How We Address It

When required by the facility program, specification, and executed scope, completed ESD flooring is tested per STM 7.1 at project completion. Resistance-to-ground measurements follow the intervals and electrode placements the standard specifies, not self-selected “representative” locations. Testing uses 5-lb cylindrical electrodes on the installed surface, with the voltage and measurement timing parameters STM 7.1 requires.

Installed-floor acceptance testing runs at the conditions present in the facility. That is separate from STM 7.1 qualification testing of flooring samples, which uses controlled conditioning. STM 7.1 requires temperature and humidity to be recorded at the time of measurement, and our reports carry those conditions alongside every resistance reading.

Results are mapped to floor plan locations so your facilities team can identify the exact test point for any measurement in the report. That spatial record supports future verification and maintenance planning.

How We Address It

The procedure depends on where the floor is in its life. STM 97.1 uses section 6.1 for flooring samples evaluated before installation, section 6.2 for a new footwear type on a previously qualified installed floor, and section 6.3 for installed floors with no prior evaluation or an unknown history. We help your ESD program team identify the evaluation the program needs and coordinate who performs it.

Every procedure measures both feet together and each foot separately. The test footwear is worn for at least ten minutes before measurement to reach moisture equilibrium. Pre-installation samples are preconditioned for at least 72 hours at 12% ± 3% relative humidity and 23 °C ± 3 °C; the installed-floor procedures run at ambient temperature and humidity, which are recorded with the results.

A passing resistance result is half of the S20.20 qualification. For a footwear/flooring system used for personnel grounding, S20.20-2021 requires system resistance below 1.0 × 10⁹ ohms under STM 97.1 and peak body voltage below 100 volts under STM 97.2, for each footwear and flooring combination. Floor-only resistance readings are reported separately so they are never mistaken for the system result.

How We Address It

Walking body voltage testing is performed on the installed floor using the footwear type the facility’s ESD program specifies. The test subject walks a defined path while body voltage is measured continuously, capturing the peak voltage generated under the test conditions.

S20.20 requires peak body voltage below 100 volts for a footwear/flooring system used for personnel grounding. Facilities handling more sensitive items may set a tighter limit in their ESD program; we test to the limit the program specifies and document it alongside the measured results.

It reports a system result, not a material property: the floor, the grounding, the footwear, and the environment working together.

How We Address It

Where the facility program, specification, and executed scope require F2170, we perform the test on concrete substrates scheduled to receive a coating or overlay. Test holes are drilled to 40% of the slab depth for slabs drying from one side, or 20% of depth for slabs drying from both sides. We install in-situ RH probes and let them equilibrate for the minimum 24-hour period before recording measurements.

Test hole frequency follows the standard’s requirements: a minimum of three holes for the first 1,000 square feet, plus one additional hole per 1,000 square feet thereafter. On large data center or manufacturing slabs, that adds up to dozens of test points, each documented with location, depth, equilibration time, and measured RH.

The selected flooring system’s manufacturer sets the moisture limit and the primer. CCF’s resinous flooring installations always include a primer. Where moisture treatment is required, an approved moisture-vapor-barrier primer replaces the standard primer, subject to the selected system’s manufacturer requirements. Any resulting change to scope, cost, or schedule is approved before application. F2170 results describe the tested locations at the time of testing, so testing is scheduled early enough to settle the primer before installation.

How We Address It

Where F1869 is specified, we run it to the standard’s requirements: sealed calcium chloride dishes on a clean, dry slab surface for 60-72 hours, with weight gain measured to calculate moisture vapor emission rate (MVER) in pounds per 1,000 square feet per 24 hours. Test locations follow the same frequency protocol as F2170.

We typically recommend F2170 as the primary moisture test and offer F1869 as a supplementary or specification-required test. F2170 measures internal slab conditions directly. F1869 measures only the surface emission rate, which can be influenced by ambient conditions and does not reflect the moisture condition deeper in the slab. Many coating manufacturers have moved to F2170 as their specified acceptance test.

If both tests are run, results are presented together with the applicable manufacturer thresholds for each, so the record addresses whichever method the specification references.

How We Address It

Every coating system has a manufacturer-specified CSP range for proper adhesion. We take the required profile from the selected system’s technical data, prepare the surface by the grinding or blasting method that profile calls for, and verify it against ICRI reference chips in the field.

Surface profile is documented and photographed at representative locations before coating application begins. That pre-application documentation serves two purposes: it confirms that the substrate is properly prepared for the specified system, and it creates a record that surface preparation met the manufacturer’s requirements.

How We Address It

We use ACI 302.1R as guidance when we assess whether a slab is ready for a coating or overlay; the project specification and the flooring manufacturer set the acceptance criteria. Before we install anything, we assess the slab for the conditions ACI 302.1R addresses: flatness, levelness, surface defects, joint condition, curing compound residue, and overall slab quality. Each of these conditions directly affects the installed flooring system’s performance and appearance.

Slab conditions outside acceptable parameters (excessive waviness, poorly cut joints, surface contamination from curing compounds, or structural cracking) are documented and reported to the project team, with corrective action recommended before we proceed.

On new construction projects where we’re engaged during design, we provide input on the slab specifications that affect flooring performance: curing methods compatible with the coatings to come, flatness tolerances suited to the flooring system, and joint design that minimizes reflective cracking through the finished floor.