Cancelled ferry sailings are causing a headache for freight.

Interislander's Kaitaki sailings were cancelled Wednesday through to this Thursday afternoon as a safety precaution after weather-related damage.

A door on the ship was hit by a large wave and needed to be looked at and repaired.

Its Aratere ferry put on extra freight sailings to compensate.

Canterbury Bulk Freight Managing Director, Alex Cowdell, says this is the latest in the ongoing saga of ferry problems, that have hurt their business.

He says they don't know when they can sail and there are trucks parked up on both sides of Cook Strait.

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