Q.   Does treated timber need painting, staining, waterproofing or maintaining?

A.   It may be a good idea to apply a water repellent sealer to slow the initial shrinkage that may occur as the timber comes into equilibrium with the environment (see manufacturer's recommendations for details on application). Some preservatives of course already provide a measure of water repellency. Using paints, stains, varnishes, etc. will almost certainly complement the preservative and enhance treated commodity's service life.

Treated timber should be cleaned and re-sealed yearly to maintain optimum appearance. Unprotected treated timber will begin to change color as a result of the wood's reaction to ultraviolet (UV) rays of the sun. Sealants with UV inhibitors will slow the color change.

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