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• 00:27, 17 March 2023 Peter wood talk contribs created page H4 (Created page with "In Australia, H4 is a hazard level for treated lumber that indicates the level of protection against decay and insect attack. The H4 treatment is a heavy-duty treatment and is suitable for use in ground contact and fresh water applications. The H4 treatment process involves treating the lumber with a preservative that contains copper, azole fungicides, and a co-biocide. This treatment provides protection against decay fungi, borers, and termites. H4 treated lumber is c...") Tag: Visual edit