Timber from pine and eucalyptus trees - the species most commonly used for construction purposes - is not durable, makifig it subject to damage from water, fungus, insect larvae and the pesky termite. To prevent this natural process of decay, timber must be treated with the appropriate preservative chemical. There is a dangerous misconception that timber simply needs to be sealed with a protective coating. Sealants merely protect against weathering and do not penetrate the timber, leaving it vulnerable to attack from insects and fungus. Make sure the timber you use has been treated by a reputable company, in line with industry standards, using the chemical best suited for its hazard class (see more detail below).
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