How to Oil a Deck
Clean and oil your deck every year to protect the timber from rain, sun, and foot traffic, and to keep the surface safe and attractive.
Quick answer
Clean the deck thoroughly, let it dry for forty-eight hours, then apply decking oil with a brush or roller in the direction of the grain. Wipe excess oil away within fifteen minutes. Leave to dry before walking on it.
Untreated decking turns grey, cracks, and becomes slippery with algae. An annual coat of oil feeds the timber, repels water, and restores the natural colour. The best time to oil is late spring or early autumn when the weather is dry and mild.
What you’ll need
- deck cleaner or pressure washer
- decking oil
- brush or roller
- masking tape
- cloths
- fine sandpaper (optional)
Step by step
- 1
Clear and mask
Remove all furniture, pots, and obstacles. Cover nearby plants with dust sheets. Mask walls and paving along the deck edge with tape to avoid staining.
- 2
Clean the deck surface
Sweep away loose debris. Scrub with deck cleaner and a stiff brush, or use a pressure washer on a low setting held at least twenty centimetres from the wood. Work along the grain to avoid raising fibres. Rinse thoroughly.
- 3
Let it dry fully
Allow the timber to dry for at least forty-eight hours in dry weather. Oiling damp wood traps moisture and causes mould and rot. Check shaded corners with touch; they dry last.
- 4
Sand rough patches
Lightly sand any lifted grain or splinters with fine sandpaper. Wipe away dust with a damp cloth and let it dry again before oiling.
- 5
Apply the oil
Stir the oil well. Dip a brush or roller and apply a thin, even coat in the direction of the boards. Work from the far corner toward the exit so you do not oil yourself into a corner. Pay extra attention to end grain, which absorbs more oil.
- 6
Wipe excess and dry
After ten to fifteen minutes, wipe any pooled or excess oil with a clean cloth. Puddles dry sticky and attract dirt. Leave the deck to dry for the time stated on the tin, usually four to twenty-four hours, before replacing furniture or walking on it.
Rags soaked in oil can spontaneously combust. Lay used cloths flat outdoors to dry, then dispose of them in a sealed metal container. Never bunch them up or leave them in a pile.
Common mistakes
- Applying oil to damp wood, which seals in moisture and causes black mould.
- Using a garden hose instead of proper cleaning, which leaves dirt and algae under the oil.
- Pouring oil straight onto the deck, which creates dark puddles that never dry properly.
- Skipping the end grain, which sucks up water and rots first.
Frequently asked
How often should I oil my deck?
Once a year in most climates. Decks in full sun or heavy rain may need a light refresh coat every six to eight months.
Can I oil a deck in direct sunlight?
No. Oil dries too fast in hot sun and leaves streaks and patchy coverage. Choose an overcast day or work in the morning shade.
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