How often should I oil a teak deck, and what care does it need?

A teak deck left to weather silver-grey needs no oil; gentle cleaning and sound seams are its main requirements. To maintain an existing oiled brown finish, inspect it monthly during the season and renew the oil when the colour fades or turns patchy, typically every three to six months in exposed conditions, following the product instructions.

Check the deck first

Establish whether the deck is bare teak, previously oiled teak or synthetic decking, as each needs different treatment. Check the boat's records and wash a small, inconspicuous area before treating the whole deck. Dark wood alone does not prove it has been oiled.

Clean silver-grey teak is normal. Green growth, black spotting and slippery patches need attention, but restoring a golden colour is a cosmetic choice, not essential maintenance.

Inspect the black caulking between the planks, the edges around fittings and any screw plugs. Look for split or detached seams, missing plugs, loose planks and areas that stay wet after neighbouring wood dries. Investigate persistent local dampness before oiling. Oil will not seal a leaking seam.

Deck construction varies considerably. Older boats may have substantial screwed planks; newer decks can have relatively thin teak bonded to the substrate. A rough surface does not mean there is enough wood left to sand.

Wash gently across the grain

During regular use, rinse away dirt as needed and wash the deck gently when it becomes dirty or slippery. In a damp berth, inspect shaded areas weekly. A covered boat in dry storage needs much less attention.

1. Remove loose sand and grit with a soft broom or rinse them away before washing.
2. Wet the deck with clean seawater or fresh water. Use warm water with a little mild soap where necessary.
3. Work gently across the grain with a sponge or very soft brush. Cover small areas without heavy pressure.
4. After using soap or cleaner, rinse thoroughly with fresh water, including the surrounding gelcoat.
5. Let the deck dry and check any remaining marks before repeating the treatment.

Hard brushes and scrubbing along the grain remove the softer wood. This leaves ridges that trap dirt and encourage further scrubbing. Avoid pressure washers, which can erode the surface and damage vulnerable seams.

For stubborn stains or algae, use a cleaner specifically suitable for teak decks and compatible with the caulking. Follow its dilution and contact time exactly, keep it from drying on the surface and test a small patch first. Repeated aggressive cleaning in pursuit of an even colour steadily wears away the deck.