The weathering properties of preservative treated timber were studied by measuring surface lignin loss and by microscopic examination after weathering, and results were related to qualitative assessments of visual appearance after weathering. Measurement of relative rates of delignification of untreated and preservative treated timber obtained by FTIR analysis, and weight loss determined on thin veneers, correlates well with visual assessments of comparative rates of weathering on solid timber exposed to natural weathering in service. Copper Azole treated timber and timber treated with chromium based preservatives showed good resistance to weathering.

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