A well-built deck lasts decades, but the boards need some looking after to stay good-looking and safe underfoot. In the Manawatū, the main enemies are moss and mildew in winter, sun in summer, and leaf litter all year. This guide covers deck cleaning and oiling for timber decks, and care for composite decking.
We build new decks rather than maintain them, but these are the steps we would follow on our own decks.
Deck oils come in penetrating oils that soak in and pigmented oils that add colour and UV protection. Water-based products are easier to clean up and dry faster; solvent-based oils often penetrate deeper. The best deck oil in NZ for your deck is one made for your timber and exposure. Pigmented oils last longer in full sun.
New kwila bleeds tannin, so wash it down several times over the first weeks before the first oil. After that, a yearly clean and oil keeps the colour. If you prefer silver-grey, you can leave it unoiled.
Treated pine decks are usually stained. To restain a deck, clean it, let it dry and recoat with the same type of product. If you are changing from an oil to a paint-type stain, or the old coating is peeling, it may need sanding back first.
Composite does not need oiling or staining. Wash it a couple of times a year with warm soapy water and a soft brush, rinse well, and clear leaves from shady corners so mildew does not get started. Avoid harsh solvents, and do not use a water blaster up close. See composite vs timber decking.
If your deck is soft underfoot, the boards are rotting, or the frame is failing, more oil will not fix it. Read when to replace a deck.
Most timber decks look best oiled or stained every year, or every two years in sheltered spots. Unoiled hardwood simply goes grey.
Carefully, and not up close. Water blasters can tear up the surface of timber, especially pine. A deck cleaner and a stiff broom is safer.
One designed for your timber and exposure. Pigmented oils give more UV protection in full sun. Test on an offcut first.
Warm soapy water and a soft brush a couple of times a year, then rinse. No oiling or staining needed.
After washing it down a few times over the first weeks to remove most of the tannin, once it is clean and dry.
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