Materials and construction
14 gauge steel
14 gauge steel is steel sheet about 0.0747 inch (1.9 mm) thick on the standard steel gauge scale. Many sources name 14 gauge corrugated corten steel for the walls and roof of a standard shipping container. Actual builds can vary by maker.
Why it matters
At 14 gauge, a flat sheet would be too thin for ocean transit, so containers use corrugation to add stiffness. The thin panels are welded to rails and corner posts that carry the main loads. That matters when you cut openings or fix damage. A common mistake is to treat the wall as heavy plate. It is thin sheet and needs care when welding, because too much heat can warp it and burn through. Another mistake is to assume every storage unit uses the same gauge. Ask the maker which gauge applies to the walls, roof, doors and floor parts, and keep that in the unit file for repairs.
Read: Container modifications for rental: Doors, windows, lock boxes and HVAC
Definition source: hz-containers.com
Related terms
12 gauge steel
12 gauge steel is steel sheet about 0.1046 inch (2.66 mm) thick on the standard steel gauge scale. Gauge numbers run backward, so 12 gauge is thicker than 14 gauge. Some portable storage makers list 12 gauge sides, as the NPSA containers page does.
corrugated steel
Corrugated steel is sheet steel pressed into a pattern of ridges and valleys. Shipping containers use it for the walls and roof. The ridges add stiffness, so a thin panel resists bending and racking forces during ocean transport, lifting and everyday handling.
corten steel
Corten steel is a weathering steel alloy used for the walls and roof of most standard shipping containers. It contains copper and chromium. When it is exposed to weather, it forms a stable, rust-like surface layer that protects the metal below. COR-TEN began as a trademarked name.
patch repair
A patch repair fixes a damaged container panel by welding a steel plate over the damage. The IICL manual treats it as one option when straightening or welding will not work. In the same section, an insert replaces a cut-out damaged section instead of overlaying it.
window cut-out
A window cut-out is an opening cut into a container wall for a window. The cut is framed and reinforced, and a window is fitted. Fixed, sliding and awning windows are common choices, often with security bars or shutters. It is a common add-on for offices and shops.
container modification
A container modification is a change made to a standard shipping container. It covers a single door cut-in up to a full fit-out. Common changes include doors, windows, vents, insulation, electrical work, HVAC, lining, partitions and plumbing. Sellers often group these changes into packages.
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