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Shipping containers are known for their strength, durability, and versatility. Built to withstand extreme conditions at sea and on land, they’re relied upon for global cargo transport, secure storage, and container conversion projects across the UK.

While most of a shipping container is constructed from corrugated steel, the flooring is different. The shipping container floor must be strong enough to handle heavy loads, but also practical for transport, storage, and conversions into usable spaces such as offices, workshops, or laboratories.

In this blog, we’ll cover:

  • What shipping container floors are made of
  • How container floors are constructed
  • Why flooring quality matters for conversions and long-term use
  • Answers to common questions about container flooring
  • How to source the right container for your needs in the UK

What Are Shipping Container Floors Made Of?

Most shipping container floors are made from 30mm marine-grade plywood, chosen specifically for its ability to withstand high pressure, moisture, and pests. This flooring material is built to handle the intense demands of cargo shipping and continues to perform well for storage and conversions.

A typical 20ft container can carry up to 44,000 lbs (nearly 20 tonnes) when fully loaded. That means the flooring has to be exceptionally tough.

Container floors are usually made up of three key elements:

  • Marine Plywood – A heavy-duty, 30mm plywood designed for wet or humid environments. Unlike standard plywood, it resists rot and warping.
  • Steel Floor Bearers – Strong steel beams support the plywood, creating a load-bearing structure that can handle extreme weights.
  • Protective Coating – Each plywood panel is sealed with varnish to eliminate pests and extend durability.

This steel and plywood combination has become the industry standard because it balances strength, cost-effectiveness, and practicality for a wide range of uses.

How Are Shipping Container Floors Constructed?

The construction process ensures that container flooring is both structurally sound and resistant to wear and tear. Here’s how it works:

  • Steel Base Creation – The container starts with a corrugated steel sheet at the base. Corrugation adds strength, while steel tubing around the edges provides reinforcement.
  • Priming & Painting – The steel is treated to protect it from rust and corrosion, extending the container’s lifespan.
  • Floor Bearers – Steel beams (floor bearers) are welded across the frame. These form the foundation for the wooden floor.
  • Marine Plywood Installation – 30mm plywood panels are securely fixed onto the bearers using drills and screws.
  • Sanding & Finishing – The floor is smoothed, sealed, and coated to prevent rough edges, pests, or moisture damage.

This layered build is what makes shipping container flooring capable of handling decades of heavy-duty use.

Why Does Container Flooring Matter?

Whether you’re buying a shipping container for storage, transport, or conversion, the quality of the flooring has a major impact.

  • Load-Bearing Strength – Safe flooring ensures your goods or equipment are protected from damage.
  • Container Conversions – For projects like offices, workshops, or accommodation, flooring impacts insulation, comfort, and long-term usability.
  • Longevity – Marine-grade plywood treated with coatings lasts far longer than untreated wood or cheaper alternatives.

For businesses or individuals considering container conversions in the UK, flooring quality is especially important. A smooth, durable, and well-protected base provides the perfect starting point for insulation, flooring overlays, and interior fit-outs.

FAQs About Shipping Container Floors

Are container floors safe?

Yes. Marine plywood is treated with protective coatings to eliminate pests and resist moisture. Containers supplied by S Jones Containers meet all international safety standards. 

Can I replace a shipping container floor?

Yes. Floors can be repaired, replaced, or overlaid with new surfaces, especially during conversions. Many customers choose to overlay with vinyl, laminate, or steel depending on the end use.

Is container flooring suitable for conversions?

Absolutely. For conversions, many clients overlay the existing plywood with commercial flooring to create a professional finish while benefiting from the original load-bearing strength.

What alternatives exist to plywood flooring?

Some containers are built with bamboo, aluminium, or all-steel floors. However, marine plywood remains the most widely used material for standard shipping containers due to its strength and cost-efficiency.

Shipping Containers for Sale and Hire in the UK

At S Jones Containers, we supply a wide range of new and used shipping containers in 10ft, 20ft, and 40ft sizes. Available for both purchase and hire, our containers are suitable for:

  • Secure storage for businesses and individuals
  • Shipping and logistics operations
  • Conversion projects, including offices, laboratories, workshops, accommodation, and more

With over 40 years of industry experience, we are one of the UK’s most trusted names in container supply and conversions. Whether you need a single container or a fleet, our team can help you find the right unit for your needs.

Get in Touch Today

If you’re interested in learning more about shipping container floors or want advice on buying, hiring, or converting a container, our friendly team is here to help.

At S Jones Containers, we make it simple to find the right solution — whether you need a durable storage container or a bespoke conversion project.


S Jones Containers Ltd

Anglian Road,
Aldridge, Walsall,
West Midlands,
WS9 8ET

Company Reg Number: 3747019
VAT Number: 729700231

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