Light Organic Solvent Preservatives (LOSPs) are used for high value building components such as external joinery, e.g. windows, and for protecting house framing against termites (H2 level). The commodities treated include windows, doors, external joinery, house frames, cladding, outdoor garden furniture, feature fences, etc. In recent times, a range of engineered timber products including laminated posts and beams are also being treated with LOSPs. A number of timber species are used for these commodities, mainly radiata and slash pine of local origin, but also imported species from north America and south east Asia, i.e. western red cedar, oregon, and meranti.
In Australia, LOSPs were originally designed to provide relatively short-term protection for building timbers and were applied by dipping processes, giving a temporary water repellent protection. These days, LOSPs are impregnated into the timber to provide long-term protection to high value commodities for use out of ground contact.
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