Types and Specifications of Flooring Materials in Shipping Containers
4. 7. 2025
The floor of a shipping container is among the most important and simultaneously most overlooked structural elements. When selecting suitable material for a new or refurbished container, or when planning a conversion into an office, house, or workshop, it is necessary to know not only the advantages and disadvantages of individual solutions, but also their real technical parameters, ecological and health aspects, and lifespan. This article is the most comprehensive Czech overview on the internet – it is based on verified knowledge from world manufacturers and long-term practical experience.
Overview of Main Floor Types
| Material | Standard Use | Thickness | Main Advantages | Most Common Disadvantages | Ecological Impact | Repairs/Maintenance |
|---|---|---|---|---|---|---|
| Marine plywood | All dry containers | 28–30 mm | Load capacity, price, availability | Chemical treatment, moisture susceptibility | Depends on wood origin | Easy part replacement |
| Bamboo | Modern containers, ecological modifications | 28–30 mm | Sustainability, strength, lower chemical treatment needs | More expensive, susceptibility to scratching, surface treatment required | Very eco-friendly | Easy maintenance, epoxy required |
| Steel/Aluminium | Refrigerated containers, special containers, workshops | 3–5 mm (sheet), on supports | Maximum durability, hygiene | High price, thermal conductivity, higher weight | 100% recyclable | Practically maintenance-free, possible welding repair |
| Vinyl (planks/floating floor) | Office conversions, residential | 2–8 mm | Easy installation, wide range of designs | VOC emissions, sensitivity to high temperatures | Varying quality | Easy plank replacement |
| “Coin” vinyl | Garages, fitness, workshops, bathrooms | 2–6 mm | Anti-slip, water resistance, durability | Industrial appearance, limited color range | Depending on material composition | Very easy maintenance |
| Epoxy coating | Conversions, plywood sealing | 1–5 mm (layer) | Sealing toxic substances, high durability | Higher application cost, UV instability | Low waste | Minimal maintenance, renewal needed after years |
| Carpet tiles | Residential spaces, offices | 5–10 mm | Comfort, acoustics, modular replacement | Absorbency, mold risk | Depends on manufacturer | Regular cleaning, tile replacement |
Standard and Original Flooring in Containers
Floor Construction: What Does the Foundation Look Like?
- Load-bearing structure: The floor is supported by a steel frame with cross-members, which are typically spaced 30 cm apart in both 20′ and 40′ containers.
- Fastening material: Floor panels are firmly bolted to the frame with special vibration-resistant screws.
- Thickness: Standard flooring is 28–30 mm thick, which allows safe transport of heavy cargo (typically up to 30 tons).
Marine Plywood Floor
Composition and Technical Parameters
- Material: Hardened marine grade plywood is composed of 19–21 layers of tropical hardwood (most commonly Apitong/Keruing, sometimes birch). These layers are bonded with durable phenolic adhesive (WBP – Water Boil Proof), which prevents delamination when in contact with water.
- Dimensions: Panels are 1,160 mm wide, 2,440 mm long, and 28 mm thick.
- Surface treatment: New containers often have surfaces impregnated with pesticides and fungicides for protection against pests. Most common active substances: Aldrin, Chlordane, Lindane – their use is now restricted in the EU.
Advantages of Plywood
- Load capacity: Floors are designed for operation of forklifts with axle loads up to 5,460 kg.
- Price availability: Plywood remains the most affordable option in terms of price/performance ratio. Manufacturing is automated, material is readily available.
- Repairability: Damaged panels can be cut out and replaced without dismantling the entire flooring system.
Disadvantages of Plywood
- Toxicity: Original impregnated plywood releases pesticides that pose health risks if the container is used as a residential (such as shipping container home) or working space. Older containers have lower levels of these substances, however, for a healthy indoor environment, floor replacement or sealing with epoxy coating is recommended.
- Moisture and pests: Wood absorbs moisture over time, leading to mold or rot development, especially if the container is not well ventilated.
- Mechanical damage: In areas of frequent heavy machinery movement, local denting or layer peeling can occur.
Checking Chemical Treatment
- CSC label: On the container doors you will find information about the pesticide used. In the “Timber Component Treatment” section, the type of substance and application date are listed.
Bamboo Floor
Composition and Technical Parameters
- Material: Pressed lamellae from fast-growing bamboo. Density is comparable to hardwood, but the material is more flexible and better withstands impact loads.
- Ecological aspect: Bamboo grows up to 10× faster than tropical hardwoods, significantly reducing the environmental burden of harvesting.
- Surface treatment: To increase water resistance, epoxy or polyurethane layers are often applied.
Advantages of Bamboo
- Sustainability: Rapidly renewable, minimal ecological footprint.
- Strength: Mechanical properties (bending strength, compression resistance) are fully comparable to tropical wood.
- Lower chemical treatment needs: Naturally resistant to most pests.
Disadvantages of Bamboo
- Higher purchase price: Bamboo is currently more expensive than traditional plywood.
- Water sensitivity: Without surface treatment, it can swell or warp with prolonged water contact.
- Surface damage: The surface is more susceptible to scratching.
Alternative Flooring for Conversions and Special Use
Steel and Aluminium Flooring
Types of Metal Floors
- Smooth sheet: Easy to clean, typically used in refrigerated containers (“reefers”), where hygiene is emphasized.
- Ribbed sheet: Surface with anti-slip pattern (so-called “tread plate,” “tear drop,” or “diamond plate”). Ideal for workshops and spaces with higher risk of liquid spills.
Advantages
- Extreme durability: Metal floors withstand the highest mechanical loads, suitable for industrial operations.
- Easy maintenance: Can be cleaned with pressure water, non-absorbent, resistant to chemicals and oils.
- Recyclability: 100% recyclable materials with long lifespan.
Disadvantages
- Thermal conductivity: Without insulation, significant temperature fluctuations can occur inside.
- Higher price: Material and installation are financially demanding.
- Weight: Adds to the overall weight of the container.
Vinyl Flooring
Types of Vinyl Floors
- Wood imitation (vinyl planks): Faithfully replicate the appearance of wood, stone, or tiles. Allow quick installation thanks to click system.
- “Coin” vinyl: Surface with round protrusions ensures anti-slip and maximum durability in wet environments. Ideal for workshops, fitness centers, and bathrooms.
Advantages
- Water resistance: Vinyl is non-absorbent, suitable even for wet operations.
- Easy installation: Laid directly on cleaned floor, individual pieces can be easily replaced.
- Wide range of designs: Possibility to match the floor with the overall design of the space.
Disadvantages
- VOC emissions: Some cheap vinyl floors can release volatile organic compounds (VOC) that affect air quality.
- Sensitivity to temperature changes: Long-term sun exposure can cause deformation or fading.
Epoxy Coatings
Function and Properties
- Sealing original flooring: Epoxy creates an impermeable barrier that prevents the escape of pesticides from plywood or bamboo.
- Durability: The surface is hard, resistant to wear, water, chemicals, and impacts.
- Anti-slip treatment: Possibility of adding anti-slip particles for safe movement even when wet.
Advantages
- Health safety: Effectively addresses the toxicity problem of old floors.
- Aesthetics: Smooth, glossy surface can be tinted to any color.
- Easy maintenance: Suitable for workshops, showrooms, garages.
Disadvantages
- Application difficulty: Requires professional application, proper substrate preparation, and climatic conditions.
- UV sensitivity: Without special UV stabilization, it can yellow over time.
Carpet Tiles
Properties
- Comfort: Improve acoustics, provide thermal comfort to the space.
- Modular replacement: In case of damage, only the affected piece can be easily replaced.
- Aesthetics: Wide range of colors and patterns for modern interiors.
Disadvantages
- Absorbency: If water leaks, there is a risk of mold development.
- Reduced lifespan: Higher loads lead to faster wear in exposed areas.
- Maintenance: Require regular vacuuming and cleaning, especially in dusty environments.
Key Terms and Important Aspects
Marine Grade Plywood
- Not 100% waterproof: Resists delamination due to special adhesive, but wood can swell with prolonged water contact.
- Quality testing: Certification according to EN 314, adhesion class 3 (water-resistant) – must be verified with the supplier.
Load Capacity and Strength
- Structural strength: The combination of plywood and cross-members ensures safe operation of forklifts with axle loads up to 5,460 kg.
- Floor load: Total container capacity is up to 30 tons of evenly distributed cargo.
Maintenance and Repairs
- Damage inspection: Regularly check the condition of the floor, especially in areas of frequent movement or where leaks are possible.
- Repairs: Minor defects can be resolved with filler, larger ones with complete panel replacement or welding (for metal floors).
- Ventilation: Key to preventing mold and rot – we recommend installing ventilation grilles.
Comparison of Individual Floor Types
| Material | Load Capacity | Water Resistance | Maintenance | Price | Sustainability | Use |
|---|---|---|---|---|---|---|
| Plywood | High | Low–Medium | Easy | Low | Low–Medium | Warehouse, transport |
| Bamboo | High | Medium | Easy | Medium | High | Ecological buildings |
| Steel/Aluminium | Extreme | Excellent | Minimal | High | High | Industry, refrigeration |
| Vinyl | Medium | High | Minimal | Low–Medium | Medium | Residential spaces |
| Coin vinyl | High | High | Minimal | Medium | Medium | Workshop, garage |
| Epoxy | High | High | Minimal | Medium | Medium | Sealing, workshop |
| Carpet | Medium | Low | High | Low | Low–Medium | Offices |
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