Open Top Containers Preston

What open-top containers are used for in Preston

An open-top container is a modified ISO steel container with a removable tarpaulin roof. Detachable steel roof bows support the cover, while the top bar above the end doors can swing out or be unbolted. This creates full-height access from above and through the end of the container.

That arrangement suits overhead loading with a crane, gantry or telehandler. Open-top units are useful on industrial estates near Red Scar and Walton Summit, as well as construction sites along the M6, M55 and A59 corridors. The flexible roof does need more care than a fixed steel roof, particularly during road transport, as cargo remains more exposed to rain and road spray.

• Best for: Over-height cargo, heavy machinery, timber packs, scrap metal and bulky industrial assemblies.
• Loading methods: Load from above with an overhead crane, or from the rear with a forklift once the header bar is swung open.
• Weather protection: Use a heavy-duty reinforced tarpaulin with TIR-compliant lashing cords.
• Alternative options: For over-width cargo, compare flat racks in Preston. For more information about top-loading equipment, see our open-top shipping container in Preston guide.

If your cargo fits within standard internal dimensions and doesn’t need crane loading, a dry container may be the simpler and lower-cost choice. See container sales in Preston or container hire in Preston.

Common sizes and frame specifications

Open-top containers are mainly available in 20ft and 40ft lengths. Both use standard ISO footprints, so they’re compatible with shipping lines, road trailers and rail wagons.

A 20ft open-top container measures 6.06m long, 2.44m wide and 2.59m high externally, with an internal volume of about 32 cubic metres. A 40ft unit measures 12.19m long, 2.44m wide and 2.59m high externally, providing around 65 cubic metres of capacity.

High-cube versions are 2.89m high externally, giving roughly 30cm more vertical clearance. That extra space can make a practical difference with taller machinery or materials.

Key structural components

• Removable roof bows: Transverse steel arches that support the tarpaulin, help keep the frame rigid and stop rainwater pooling.
• Swivel door header: The hinged top bar at the rear swings outward, giving taller or longer equipment a clear route into the container.
• Lashing rings: High-tensile steel rings welded along the interior bottom and upper side rails. They’re used to secure heavy machinery during transit.
• TIR cable system: A continuous steel wire cable threaded through the tarpaulin eyelets to secure the cover for international customs clearance.

For other equipment footprints, compare the specifications of a 20ft container in Preston and a 40ft container in Preston.

Condition grades and practical inspection checks

Open-top containers depend on two systems working properly: the steel frame and the flexible tarpaulin assembly. Check both before you buy or hire a unit.

Standard condition terms

• One-trip units: Made overseas and shipped with one cargo load. They have clean paintwork, intact tarpaulin seals and pristine floors.
• Cargo-worthy units: Previously used for international shipping. They may have cosmetic wear, light surface rust and patch repairs, but remain structurally certified for freight use.
• Wind and watertight units: Weatherproof units suited to static site storage. They keep out rain when the tarpaulin and roof bows are correctly secured.
• IICL grade: A condition grade based on inspection criteria set by the International Institute of Container Lessors.

Check that every roof bow is present and sits firmly in its corner socket. Look for tears in the tarpaulin, inspect the end-door gaskets and operate the swivel header. It should move smoothly, without sticking or binding.

For sea or rail transport, the container must have an active CSC plate. This statutory safety plate confirms the unit’s structural approval under the International Convention for Safe Containers, managed by the IMO. For freight movement terms, the standard industry conditions published by BIFA set out carrier liability frameworks.

Hire versus buy for Preston projects

The right choice usually depends on how long you need the container, how often it’ll be used and whether you want to commit capital to a permanent asset.

When hiring makes sense

• Short construction projects or temporary factory plant maintenance.
• One-off export movements where the container won’t return to Preston.
• Seasonal demand for overhead-loaded scrap or timber storage.
• Projects where you need maintenance support and off-hire collection.

When buying makes sense

• Permanent yard storage for oversized machinery or heavy raw materials.
• Regular, long-term transport loops within your own logistics operation.
• Situations where you’ll install permanent modifications, such as custom internal cradles.

For temporary requirements, see container hire in Preston. If the container will remain part of your operation, view options through container sales in Preston.

Delivery method, site access, and placement

Site access needs checking before an open-top container is booked. A lorry carrying a 20ft or 40ft unit is a large, heavy vehicle, and the delivery route must have suitable width, clearance and ground strength.

Deliveries are generally made using HIAB crane-equipped lorries. The vehicle’s hydraulic crane arm lifts the empty container from the side of the truck and places it at the drop point.

A 20ft unit requires an 8-wheeler rigid truck measuring roughly 12m long. A 40ft unit needs an articulated lorry of up to 16.5m. The UK government’s guide to lorry types and weights explains vehicle weight classes and axle load limits.

Site clearance checklist

• Allow at least 3m of clear width through entrance gates.
• Use firm hardstanding, such as concrete, tarmac or compacted hardcore, for the delivery route and drop point.
• Keep 6m to 8m of overhead clearance, with no power lines, low cables, branches or building eaves in the way.
• Allow up to 5m to 6m of total lateral width for the lorry’s hydraulic outrigger stabiliser legs.
• Make sure the drop area is level across all four corner castings.

Soft ground or uncompacted earth can allow the steel frame to sink and twist. This is known as racking. Once the frame distorts, the rear doors and swivel header may jam.

Place level concrete slabs, paving stones or railway sleepers beneath the four corner castings. They’ll raise the container, help keep the frame square and allow airflow underneath. For the wider delivery arrangements, see our guide to container delivery in Preston.

Security, condensation, and weatherproofing

An open-top container needs regular attention to keep out weather and protect its contents. Theft prevention matters too, especially where machinery or valuable materials are stored.

Fit a heavy-duty steel lockbox over the locking staples on the double end doors. The lockbox covers the padlock area and helps protect the padlocks from angle grinders and bolt cutters.

Tarpaulins can be cut, so valuable machinery should be stored in a supervised yard, a well-lit compound or a secure site perimeter.

Managing condensation and weather ingress

• Fit every roof bow correctly. Missing bows can leave the tarpaulin sagging, which allows rainwater to collect.
• Keep the tarpaulin tight with the peripheral lashing ropes and corner fasteners.
• Raise stored cargo above the marine plywood floor on wooden pallets so air can circulate underneath.
• Place industrial desiccant bags inside wrapped cargo to absorb trapped moisture during damp Lancashire winters.

Export compliance, customs, and trade regulations

International ocean freight brings extra safety, customs and transport checks. Complete these before the container leaves your site.

Check that the payload, together with the container’s tare weight, stays within the maximum gross mass shown on the CSC plate. Cargo extending above the top side rails must be declared as out-of-gauge, or OOG, freight to the shipping line and haulier. Special vessel stowage and road transport permits may be needed.

For tariff classifications, export customs declarations and international trade guidance, use GOV.UK or the Department for Business and Trade.

Define the point at which risk transfers using the Incoterms 2020 definitions published by the International Chamber of Commerce. Check marine cargo insurance with your underwriter as well. Standard carrier liabilities don’t cover the full commercial value of every loss in transit.

Step-by-step ordering process

Use these steps to choose the right unit and prepare for delivery.

1. Measure the cargo’s exact length, width, height and gross weight, including any over-height protrusions.
2. Choose between a 20ft and 40ft open-top container, taking account of both cargo volume and available handling equipment.
3. Decide whether hiring or buying suits the project duration.
4. Check the site entrance, turning radius, overhead clearance, delivery position and ground hardness.
5. Confirm whether the container needs a valid CSC plate for international freight movement.
6. Send site photographs or access notes so the HIAB truck can be assessed for suitability.
7. Prepare four level corner support pads using concrete slabs or timber sleepers at the offload point.
8. On delivery, inspect the tarpaulin, operate the doors and header, then complete the cargo loading.