How are sandwich panels used in raised access flooring systems?

compoform · 05 Sep 2026

Sandwich panels are used in raised access flooring systems as the structural floor element that sits on top of adjustable pedestals, distributing point loads and foot traffic across the floor void. Their combination of high stiffness, low weight, and dimensional stability makes them a practical alternative to traditional steel-encased chipboard or calcium sulphate tiles. The sections below answer the most common questions about how sandwich panels perform in this application.

Note: This article covers the broader sandwich panel market. Our range at Compoform is limited to PP honeycomb and PET foam cores for commercial vehicles and scaffolding.

What makes sandwich panels suitable for raised access floors?

Sandwich panels are suitable for raised access floors because their layered construction, a stiff core bonded between two reinforced face skins, delivers a high strength-to-weight ratio that conventional solid panels cannot match. The core resists shear forces across the panel span while the skins carry bending loads, producing a panel that is rigid under foot traffic without being unnecessarily heavy.

Several structural properties make this construction particularly relevant for raised flooring:

Span efficiency: The sandwich geometry allows panels to bridge the gap between pedestals without deflecting beyond acceptable limits, even under concentrated point loads from office equipment or server racks.
Dimensional stability: Thermoplastic composite panels resist moisture absorption, which prevents the warping and swelling that can affect wood-based panels in environments with fluctuating humidity.
Consistent load distribution: The face skins spread point loads laterally before transferring them to the core, reducing peak stress at any single contact point.
Low dead weight: A lighter panel reduces the cumulative load on the building structure below, which matters in retrofit projects where the existing slab has limited spare capacity.

Fire performance is also a relevant factor. Composite floor panels can be engineered to meet EN 13501-1 fire classifications, making them compatible with the fire safety requirements of commercial and data centre environments.

What types of sandwich panels are used in raised access flooring?

The most common sandwich panel types used in raised access flooring are steel-encased chipboard or calcium sulphate panels, aluminium honeycomb composite panels, and fibre-reinforced thermoplastic panels with PP honeycomb or foam cores. The choice depends on the required load class, the environment, and whether weight is a constraint. You can review structural panel applications across different industries to understand how these configurations are used in practice.

Steel-encased and mineral-based panels

Steel-encased chipboard panels are the traditional standard in commercial raised flooring. They are cost-effective and widely available, but they are heavy and susceptible to moisture at the core if the steel enclosure is compromised. Calcium sulphate panels offer better fire resistance and dimensional stability but add significant weight per panel.

Fibre-reinforced thermoplastic composite panels

Thermoplastic composite panels with PP honeycomb cores represent the higher-performance end of the market. These panels use glass-fibre-reinforced skins laminated onto a structured core, producing a panel that is significantly lighter than steel-encased alternatives while delivering comparable or superior bending performance. The PP honeycomb core at 140 kg/m³ provides high compressive resistance, which is important for point loads from server rack feet or heavy equipment. Surface finishes such as anti-skid coatings are integrated directly into the skin during manufacture, removing the need for secondary surface treatment.

How do sandwich panels compare to traditional raised floor panels?

Sandwich panels outperform traditional raised floor panels on weight and moisture resistance, while traditional steel-encased or calcium sulphate panels often have a lower unit cost and wider availability. The performance gap becomes most significant in high-load environments, retrofit projects with structural constraints, or applications where panel replacement frequency affects total cost.

A direct comparison across the most relevant criteria:

Weight: Composite sandwich panels are considerably lighter than steel-encased chipboard or calcium sulphate panels of equivalent thickness. This reduces installation effort and cumulative structural loading.
Moisture resistance: Thermoplastic composite panels do not absorb water. Traditional chipboard cores can degrade if moisture enters through damaged edges or surface finishes, leading to delamination and loss of structural performance.
Bending performance: PP honeycomb-core composite panels deliver high bending stiffness relative to their weight. Traditional panels achieve comparable absolute stiffness but at a higher mass penalty.
Lifespan: Composite panels resist the degradation mechanisms that limit the service life of wood-based panels. In environments with regular cleaning or chemical exposure, this difference becomes commercially significant over a 10 to 15-year building lifecycle.
Unit cost: Composite sandwich panels carry a higher upfront cost than standard raised floor tiles. However, when replacement cycles and installation labour are factored in, the total cost of ownership over a building’s service life is often lower.

How are sandwich panels installed in a raised access floor system?

Sandwich panels in a raised access floor system are installed by placing them onto a grid of adjustable steel pedestals, which are first levelled to the required floor height. The panels rest on the pedestal heads and are typically secured with adhesive, mechanical fixings, or interlocking edge profiles, depending on the system design and the load requirements of the application.

The installation sequence follows a straightforward logic:

Pedestal layout: Pedestals are positioned on the structural slab according to the panel grid dimensions, typically at 600 mm centres for standard panel formats.
Levelling: Each pedestal head is adjusted to achieve a flat, level plane across the entire floor area. This step is critical because any height variation transfers directly into panel deflection under load.
Panel placement: Panels are laid onto the pedestal grid, starting from a fixed reference corner and working outward. Large-format panels reduce the number of joints and speed up installation.
Edge treatment and sealing: Panel edges are sealed or protected to prevent moisture ingress at the core, particularly important in environments subject to cleaning or condensation.
Surface finishing: If the panel skin does not provide a finished surface, a floor covering is applied on top. Composite panels with integrated anti-skid or decorative finishes eliminate this step.

Panel dimensions play a practical role in installation efficiency. Larger panels cover more area per placement, reducing the number of joints and the time spent aligning edges. Custom-cut panels are useful for perimeter rows and around penetrations such as cable risers or columns.

What load ratings can sandwich panels achieve in raised flooring?

Sandwich panels used in raised access flooring can achieve load ratings that cover the full range of commercial and industrial applications, from standard office environments to high-density server rooms and industrial platforms. The specific load capacity depends on panel thickness, core type, core density, skin architecture, and the pedestal span.

Load performance scales predictably with panel configuration. Thicker panels with denser cores carry higher loads. As a reference point from Compoform’s own testing, a 30 mm floor panel with a PP honeycomb core sustained an average maximum load of 5,647 N in the tested geometry, compared to 3,240 N for the 15 mm variant of the same construction. These figures are specific to the tested configuration and span; actual performance in a raised floor installation will depend on pedestal spacing and the load distribution geometry of the application.

For raised access flooring, load classes are typically defined by the relevant building or fit-out specification rather than a single European standard. Designers should confirm the required concentrated load, uniformly distributed load, and rolling load values for their specific environment before selecting a panel configuration. In scaffolding applications, EN 12811 provides a structured load class framework; a comparable level of rigour is appropriate when specifying composite panels for high-load raised floor environments.

Are sandwich panels in raised access floors recyclable or sustainable?

Thermoplastic sandwich panels used in raised access floors are recyclable at end of life because the thermoplastic matrix can be remelted and reprocessed. This distinguishes them from thermoset composite panels, which cannot be remelted and are more difficult to recycle. For European OEMs and building operators subject to CSRD sustainability reporting obligations, the recyclability of structural materials is increasingly a compliance consideration, not just a preference.

Several sustainability factors are relevant when evaluating composite panels for raised flooring:

Thermoplastic recyclability: PP-based skins and cores can be mechanically recycled. The glass fibre content complicates full material recovery, but the thermoplastic fraction is recoverable, which is relevant under the EU’s evolving circular economy framework.
Longevity as a sustainability argument: A panel that lasts significantly longer than a wood-based alternative reduces the total material consumed over a building’s life. Fewer replacement cycles mean less manufacturing energy, less waste, and lower embodied carbon per year of service.
Weight and operational energy: In transport and modular construction contexts, lighter panels reduce the energy required to move and install them. In a fixed raised floor, this benefit is less direct but still relevant during installation and any future reconfiguration.
No added formaldehyde or biocides: Thermoplastic composite panels do not require the preservative treatments associated with wood-based panels, which is relevant for indoor air quality in occupied buildings.

European OEMs and facility managers working under CSRD reporting requirements should document the material composition of structural elements at the point of specification, so that end-of-life recyclability can be demonstrated in sustainability disclosures.

How Compoform Supports Raised Flooring and Structural Panel Applications

We design and manufacture thermoplastic sandwich panels for applications where structural performance, low weight, and long service life are the deciding factors. While our 2026 focus is on commercial vehicles and scaffolding, the panel configurations we produce, particularly our PP honeycomb floor panels, are directly relevant to raised flooring and industrial platform applications that share the same load and durability requirements.

Here is what working with us looks like in practice:

Panel configuration review: We review your load requirements, pedestal span, and installation environment before recommending a panel specification. We do not ship panels to a generic spec and leave integration to you.
Custom dimensions: Panels are available in dimensions up to 13,500 mm x 2,950 mm, cut to your exact specification. Standard sheet formats are also available where they fit your workflow.
Validated performance: Our 30 mm PP honeycomb floor panels have been load-tested to Compoform’s own test protocols, giving you a documented performance baseline to work from rather than a manufacturer’s estimate.
Surface finish options: Anti-skid and decorative surface finishes are integrated into the panel during manufacture, removing secondary processing steps from your production line.
Edge protection: Edge sealing and edge bending are available to protect the core from moisture ingress, relevant for panels in environments subject to regular cleaning or condensation.

If you are specifying composite panels for a structural floor application and want to confirm whether our configurations match your load class and dimensional requirements, speak with our composite panel engineering team. We will review your design, identify any integration issues early, and help you reach a panel specification that works for your assembly process, not just on paper.