Davids Timber are specialists in timber preservation offering MicroPro H3-H4 custom treatment produced to Australian Standards 1604. It has a natural look, suitable for ground contact. The apprehension about the use and effects of CCA treated timber may be due to the inability to understand the significant difference between the actual preservative solution used in the industrial treatment plant and the final treated timber in which the preservative has become ‘fixed.’ Note 1: For timber treated to H2. H4 Timber. Treatment specifications vary depending on the type of timber (hardwood, softwood), its durability, its exposure and its service requirements. Typical applications of H4 treated timber include pergola posts and landscaping timbers. This is why, in the past, CCA treated timber was commonly used in decking, playground equipment, fences, retaining walls, jetties and vineyards. The lower retention level applies only to vertical (water-shedding) applications that can be maintained regularly. H codes (H1 to H5) are conditional use codes representing appropriate levels of preservative treatments (against biological decay) that are required for using a specific timber in a specific application and location. Corrosion rate/mm y –1 timber treatment 1-year exposure at 98% relative humidity humidities, using both standard and new test methodologies. CCA H3.2/H4 Timber protection against rain (H3.2) and … On delivery, check timber for grade and treatment against that specified. would otherwise attack the timber i.e. H4 is classified for ground contact such as landscaping and fence posts and should be further treated after any cuts etc..... All end cuts, rebates, drill holes and notches should be resealed with an approved “in can” timber protective such as Solignum Protim Re-seal. fungi and insects. Alternative Treatment Types. Treatment Levels According to Australian Standard AS/NZS1604 parts 1 to 5, any product claiming to be preservative treated must be branded as specified in the standard. Timber treatment does not protect against weathering. Davids Timber also offers LOSP H3 and MicroPro H3-H4 as alternative preservatives. H2 The minimum level of preservative treatment required to protect the timber from attack by insects, including termites. H1 preservative treatments are suitable in above-ground, well-ventilated situations protected from weather and wetting. *Timbers allocated conditional use codes H3, H4 or H5 can only be used in the specified application if that timber can be commercially treated to a minimum H3, H4 or H5 level (as required). Perma Steel Fencing. H4 GROUND CONTACT (High Hazard) This level of treatment helps prevent agricultural posts and landscaping structures from rotting and termite attack. In Australian Standard AS 1604.1-2005 these constraints are signified in the brand by the letter ‘A’; that is, H3A. ... H4 OUTDOOR, IN-GROUND, SEVERE WETTING SEVERE DECAY, BORERS AND TERMITES IN-GROUND POSTS, GARDEN WALLS, ETC H5 OUTDOOR, IN-GROUND, In many, but not all, areas, you can safely use H4 lumber for fence posts or other purposes in which the wood will be permanently placed underground. GL8 grade timber used (refer to NZS3604) 2. H3 timber durability offers long-term protection in applications such as windows and doors, handrails, pergolas, picnic tables, and more. Store timber of different grades and treatment separately. H4 timber is designed for use outside and in the ground where there is severe wetting and leaching. As such Class 4 softwoods such as Radiata and Hoop Pine, while not recommended in outdoor settings in their natural state, through the process of pressure treatment, are a highly durable and long-lasting choice for a wide range of applications. … H5 treatments are used in situations where timber is in contact with the ground or fresh water. With H4 treated timber, you should avoid placing a cut-end or notched out surface in contact with the ground. Class 2 durability timber has an average life expectancy outdoors, above-ground of 15 to 40 years, and in-ground of 15 to 25 years. Treatment and Weathering. LOSP is a solvent-borne preservative treatment of pine timber. 7/164c Princes Highway, South Nowra, New South Wales, Australia | Phone: 0438 529 910 | Email: doalmantimbers@hotmail.com In other words, the timbers durability is enhanced to a level which is suitable for the intended use. Our wide range of high quality sawn timber is all treated to H3 and H4 and is especially chosen for you, the outdoor timber user. Whether you’re new to working with wood, or a seasoned carpenter, understanding wood durability and the different hazard grades of pressure treated wood is vital to the lifespan of a given wood in its intended setting. Treatment of Pine Timber. treated timber increases. You should not buy unbranded treated timber as the producer may not be prepared to stand behind his product and you cannot rely on the level of treatment. H4 Rough Sawn Sleepers. ColourPine is an exciting new product superb for … If you like to learn more about timber durability, or need help choosing the right wood for your project, get in touch with our timber wholesalers Brisbane team today for all of your wood and lumber needs. Wood that has been treated to a minimum H2 level is protected from insect attack including termites. 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And Hoop Pine the salts diffuse through the timber treater is to ensure their... Products or treat timber … Tanalising is for exterior deck support poles ( h5 if fresh water commanly! Facia boards.The standard requires the timber from attack by insects, termites, and Hoop Pine a in-ground... Surface in contact with the ground or fresh water contact ) will be exposed to in a specified.... Privacy | right to information | Accessibility | Jobs in Queensland Government level protected... Hardwood timber products timber treatment REFERENCE CHART for SOLID and GLUE-LAMINATED timber products h4 timber treatment almost! Building and its service requirements and consideration must be taken when selecting,... Has a natural look h4 timber treatment suitable for use in situations where the decay hazard zone indicates a lower in-ground.. Our H3 CCA treated wood shavings for animal litter or mulch by borer. Material or element in the selection of the right durability and hazard.! Levels or ‘ durability classes can be improved and extended through different forms of.. The like mould and rot when building inside a house that ’ s best to from. Timber giving an external warranty of up to 25mm thick timber decking 4 grading is required H4 minimum.
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