How much maintenance does a container need?
Little — and that's down to the material. Shipping containers are made of
Corten steel (weathering steel). That steel deliberately rusts a little at the surface: the thin, dense layer of rust bonds to the steel and seals it, so the steel beneath can't rust further. Surface rust on a container is therefore not a defect but a protective layer — precisely why containers can stand outdoors for decades. What you do watch for is rust that can go
through: spots where water pools or where the paint is damaged down to bare steel. Your annual maintenance in four points:
- Keep the roof clear — wipe away leaves, twigs and above all standing water after rain; the roof is the only surface where water can pool
- Touch up deep scratches — sand, primer, a coat of marine paint; you can leave surface rust spots be
- Door seals and hinges — grease hinges and locking bars once a year, keep the seals clean and supple
- Keep the underside dry — container on blocks or sleepers, so air keeps flowing beneath the floor
Want to know more? Read
our detailed maintenance tips.