Sandwich panels are replacing plywood floors in commercial vehicles because they last significantly longer, weigh less, and resist moisture without degrading. A thermoplastic sandwich panel floor typically outlasts plywood by a factor of three to four, eliminating multiple replacement cycles over a vehicle’s working life. The questions below unpack the structural, performance, and financial reasons driving this shift.
What are the structural disadvantages of plywood in commercial vehicle floors?
Plywood floors in commercial vehicles fail progressively through moisture absorption, delamination, and mechanical fatigue. Unlike composite alternatives, plywood is an organic material that swells when wet, loses stiffness as its layers separate, and eventually requires replacement, often within three to five years in heavy transport use. These are not edge-case failure modes; they are the expected service pattern.
The structural problems with plywood fall into three categories that compound over time:
- Moisture ingress: Plywood absorbs water through cut edges, fastener holes, and surface cracks. Once moisture penetrates the core, the adhesive bonds between veneers weaken, and the panel begins to delaminate from the inside out. In vehicles that are regularly washed down or exposed to rain during loading, this process accelerates significantly.
- Point-load vulnerability: Plywood distributes concentrated loads poorly compared to sandwich panel construction. Pallet corners, forklift tines, and heavy freight create localised stress that causes surface crushing and internal shear failure over time.
- Dead weight: Plywood is dense relative to its structural contribution. In a commercial vehicle where every kilogram of structural dead weight reduces legally permitted payload capacity, this is a direct cost, not just an engineering inconvenience.
The result is a floor material that demands repeated replacement, generates downtime, and contributes unnecessary mass to the vehicle structure throughout its working life.
How much weight can switching to sandwich panels save in a commercial vehicle?
Switching from plywood to a thermoplastic sandwich panel floor can reduce floor weight substantially, with the exact saving depending on panel thickness, core type, and the plywood specification being replaced. In practical terms, a sandwich panel floor using a PP honeycomb core is considerably lighter than a comparable plywood floor of equivalent load-bearing capacity, and that weight difference translates directly into payload capacity.
For truck body builders and trailer manufacturers, this matters in two distinct ways in 2026. First, every kilogram saved in the floor structure is a kilogram that can be converted into revenue-generating cargo under European gross vehicle weight regulations. Second, for operators running electric trucks and vans, the benefit extends beyond payload: lighter body structures extend battery range per charge. Every kilogram of structural dead weight reduces range, which makes weight reduction a range argument as much as a payload argument. EV fleet procurement teams now routinely ask about body structure weight as part of their vehicle specification process.
The weight advantage of sandwich panels is not marginal. When you replace a full trailer floor or a large truck body floor, the cumulative saving across the panel area is meaningful enough to affect both payload economics and, for electric vehicles, operational range planning. You can explore the full range of commercial vehicle and transport panel applications to see how these weight savings apply across different vehicle types.
How do sandwich panels perform against moisture, impact, and heavy loads?
Thermoplastic sandwich panels with PP honeycomb cores are inherently moisture-resistant: the core material does not absorb water, and the glass-fibre reinforced thermoplastic skins do not delaminate when wet. Against impact and heavy loads, the panel’s sandwich construction distributes stress across the skin-core interface rather than concentrating it at a single point, which is why these panels sustain significantly higher loads than plywood of comparable thickness.
Moisture resistance
Unlike plywood, thermoplastic panels do not swell, rot, or lose structural integrity when exposed to water. Edge sealing and edge bending protect the core from moisture entry at cut edges and fastener points, which is particularly relevant for truck floors that are washed down regularly or exposed to weather during loading operations. The skins themselves are non-porous, so surface moisture does not migrate into the panel structure.
Impact and load performance
Sandwich panel construction separates the load-bearing skins from the lightweight core, creating a structure that resists bending and point loads efficiently. Based on Compoform’s own test data, a 30 mm floor panel with a PP honeycomb core sustains an average maximum load of 5,647 N in the tested geometry, compared to 3,240 N for a 15 mm variant, demonstrating how panel thickness can be specified to match the actual load demands of the application. The black anti-skid surface finish on floor panels is inherent to the product, providing traction without additional surface treatments that could wear away over time.
What types of sandwich panels are used in commercial vehicle floors?
The sandwich panels used in commercial vehicle floors are typically built with a PP honeycomb core bonded between glass-fibre reinforced thermoplastic skins. The PP honeycomb core delivers high compressive and bending strength relative to its weight, making it the preferred core construction for floor applications where load-bearing performance is the primary requirement.
Core thickness is selected based on the load specification of the application. A 30 mm PP honeycomb floor panel is self-supporting: it requires no aluminium subframe beneath it, which removes a production step for truck body builders and reduces overall vehicle weight further. A 15 mm variant suits lighter-duty applications where the load profile is less demanding. The skin layup uses a cross-ply architecture that equalises mechanical properties in both directions, so the panel performs consistently regardless of installation orientation.
It is worth noting that wall panels and scaffolding panels use different configurations. Wall panels typically use PP foam cores with PET-film surfaces, while scaffolding panels use a directionally optimised skin layup suited to plank-style loading. For commercial vehicle floors specifically, PP honeycomb cores with glass-fibre reinforced skins represent the standard configuration because of the compressive and bending demands involved.
Are sandwich panel floors compatible with existing vehicle body designs?
Yes. Sandwich panel floors are designed as direct replacements for plywood floors and require no modification to existing vehicle body structures. Any mounting system, fastener pattern, or body frame that accepts a plywood floor panel accepts a sandwich panel floor at the same dimensions, no redesign, no hardware changes, and no retraining of assembly or refurbishment personnel.
This compatibility is a practical requirement for OEM adoption. Truck body builders and trailer manufacturers cannot redesign their production processes around a new floor material; the material needs to fit the process. Sandwich panels can be produced in custom dimensions cut to your exact specification, including the large panel sizes needed for full trailer floors. Production dimensions of up to 13,500 mm x 2,950 mm are achievable, which covers the full floor length of most commercial trailer configurations in a single panel or minimal joins.
The anti-skid surface finish on floor panels is built into the panel rather than applied as a separate layer, so there is no additional surface preparation required before installation.
When does switching from plywood to sandwich panels make financial sense?
Switching from plywood to sandwich panel floors makes financial sense when you account for the full lifecycle cost rather than the unit purchase price. A thermoplastic sandwich panel floor lasts 12 or more years in heavy transport use, compared to three to five years for plywood. Over a 15-year vehicle life, that difference eliminates two to three plywood replacement cycles, and once you add panel cost, installation labour, and vehicle downtime for each replacement, the composite floor is cheaper per year of service even at a higher upfront price.
The financial case strengthens further when you factor in:
- Payload revenue: Weight saved in the floor structure converts directly into additional payload capacity, generating revenue on every loaded journey for the life of the vehicle.
- EV range economics: For operators transitioning to electric trucks, a lighter floor extends range per charge, reducing charging frequency and improving route economics in ways that compound over time.
- Reduced handling and labour: Lighter panels are faster to handle and install, reducing labour time during both initial build and any maintenance operations.
- Sustainability compliance: Thermoplastic panels are recyclable and support compliance with the EU End-of-Life Vehicles (ELV) Directive, which is increasingly a procurement requirement for European fleet operators and OEMs subject to CSRD sustainability reporting obligations.
The crossover point, where composite becomes cheaper than plywood on a total cost basis, typically arrives well within the first replacement cycle that the composite floor avoids. For high-utilisation vehicles with frequent wash-down cycles or exposure to wet loading environments, the crossover arrives sooner.
How We Help You Switch from Plywood to Sandwich Panel Floors
We manufacture thermoplastic sandwich panels specifically configured for commercial vehicle floor applications, using PP honeycomb cores and glass-fibre reinforced thermoplastic skins. Before production, we review your vehicle body design, load specification, and assembly process to confirm the right panel thickness, core density, and skin layup for your application, not a generic off-the-shelf configuration.
What this means in practice:
- Custom dimensions: Panels are produced to your exact floor dimensions, up to 13,500 mm x 2,950 mm, on our 72-metre double belt press production line, eliminating unnecessary joins and simplifying installation.
- Drop-in compatibility: We confirm that the panel specification fits your existing body frame and mounting system before production begins, so there are no surprises on the assembly line.
- Application engineering: Our team reviews your design, identifies any integration considerations, and optimises the panel configuration for your specific load profile and production process.
- Lifecycle support: We remain available through integration, any issues that arise in service, and future iterations, not just the initial order.
If you are specifying a floor panel for a truck body, trailer, or cargo box and want to understand which panel configuration fits your load requirements and assembly process, contact our engineering team to start the review. We will assess your design and recommend a configuration before any commitment to production.