GRP Floor Plate: Sanded or Checker Plate? The Decision Guide

What GRP Floor Plates Offer

GRP floor plates are closed, flat coverings made of glass-fiber reinforced plastic. Unlike GRP gratings, they have no openings, thus offering full-surface coverage. This makes them the right choice wherever liquids should not drain off, small parts should not fall through, or a smooth, seamless surface is desired.

Both variants share the essential GRP properties: no rusting, no splintering, electrically insulating, light compared to steel or aluminum sheets, and can be cut with simple tools. What distinguishes them is only the surface.

The Sanded Surface: Maximum Grip

For the sanded GRP floor plate, fine quartz sand is incorporated into the uncured resin surface during manufacturing. The result is a permanently rough, granular texture that is firmly bonded to the material and does not detach or wear off.

This surface achieves slip resistance class R13 according to DIN EN 16165 (formerly DIN 51130). R13 is the highest class for floor coverings in shod areas and is tested by the ramp test with motor oil and safety shoes at an inclination angle of over 35 degrees.

The price for maximum grip is a higher cleaning effort. The rough surface effectively traps dirt, oil, and fine particles. This is intentional in practice because it's precisely what keeps the plate safe. It can be cleaned well with a high-pressure cleaner, brush, and suitable cleaning agent, but not with a quick mop.

The Checker Plate Structure: Industrial Look with Easy Maintenance

The GRP floor plate in checker plate structure is the GRP counterpart to the classic aluminum checker plate used in vehicles and workshops. The embossed studded surface looks familiar and immediately conveys a sense of industrial suitability.

The slip resistance is not comparable to the sanded version. The smoother studded structure offers solid grip on dry and slightly damp surfaces, but is clearly at a disadvantage in oily or greasy environments. For areas with moisture and oil, the sanded plate is the significantly safer choice.

What distinguishes the checker plate structure is its easy cleaning. The flatter surface texture can be wiped, swept, and washed with a normal cleaner. For indoor spaces, workshop areas without oil, loading areas, and areas where appearance matters, it is the more practical choice.

The Direct Comparison

Slip Resistance: What the Standards Say

Slip resistance classes R9 to R13 are determined according to DIN EN 16165 (which superseded the former DIN 51130 in December 2021) by a walk-on test on an inclined plane with motor oil and standardized footwear. The higher the number, the steeper the angle at which the test person can still stand securely.

R13 means: secure grip at over 35 degrees inclination with oil on the surface. This is the maximum value and is legally required for many commercial areas. Workplace regulation ASR A1.5/1.2 and DGUV Rule 108-003 define which areas require which class.

For private households, DIY enthusiasts, and uncritical commercial areas without oil or grease exposure, the checker plate structure is entirely sufficient and more practical for everyday use. The R13 requirement does not automatically apply to every floor covering.

Cleaning and Maintenance in Everyday Use

The sanded surface is designed so that dirt and liquids remain in the roughness and drain away. This is the mechanism behind its high slip resistance. For cleaning, this means a normal mop is not sufficient. A high-pressure cleaner with warm water or a hard brush with cleaning agent is recommended. In heavily soiled industrial areas, this is an accepted cleaning effort.

The checker plate behaves like a normal industrial floor covering. Sweep, wipe, and wash with a light cleaner if necessary. In areas sensitive to cleanliness or wherever quick interim cleaning is important, this is a real advantage.

Both variants are chemically resistant and tolerate common industrial cleaning agents. Aggressive acids or alkalis should be tested beforehand in case of doubt.

Installation and Cutting

Both types of plates can be processed in identical ways. GRP can be cut with a circular saw, jigsaw, or angle grinder with a cutting disc. When sawing, fine glass fibers are produced, so safety glasses and respiratory protection are recommended.

Three options are available for fastening. Bonding with epoxy resin adhesive is the most durable solution on concrete, steel, or other stable substrates. Screwing offers the advantage of detachability. Loose laying is suitable for temporary applications or surfaces that need to be opened regularly.

Quick Decision-Makers: Who Takes What?

Conclusion

The decision is simpler than it initially seems. Wherever oil, grease, moisture, or ice are involved, the sanded variant is the only safe choice. It achieves R13, is designed for demanding environments, and meets the normative requirements in commercial areas with a risk of slipping.

The checker plate structure is the more practical, easier-to-maintain option for all other areas. It provides solid slip resistance for dry to slightly damp environments, looks tidier, and can be cleaned quickly.

Since both variants cost the same and are made of the same GRP material, the decision is solely a matter of the application area, not the budget.