The eventual end-use of Tanalised® pressure treated timber is classified into one of four categories. These ‘Use Classes’, defined in BS EN 335-1, are based on the potential threat to the timber from decay or insect attack in its eventual application.
The applicable Use Classes are summarised below:
When you purchase Tanalised® timber from us, we will advise which Use Class it has been treated to.
*Please note, Tanalised ® timber cannot be placed near, over or in direct contact with water.
Timber treated with Tanalith® E wood preservative is suitable for use in aviaries. Tanalith® E is authorised under the Biocidal Products Regulation EU 528/2012, having been rigorously assessed for its impact on human and animal health, as well as the environment.
Please refer to the Tanalith® E Treated Timber User Guide for more information on the use of Tanalised® Timber. Click Here
The Control of Substances Hazardous to Health (COSHH) Regulations refer to substances. Preservative treated timber is not a substance but an article and therefore COSHH regulations do not apply to the actual treated timber. A ‘COSHH and treated timber’ information sheet does provide more details relating to this classification.
The preservative treated timber should be delivered to you in a surface dry condition. The Tanalith® E Treated Timber User Guide provides health and safety handling recommendations.
The preservative treated timber should be delivered to you in a surface dry condition. The Tanalith® E Treated Timber User Guide provides health and safety handling recommendations. To download a copy, click here
Ideally timber should be cut or notched before treatment. However, where these procedures are required on-site, the surfaces exposed by the cutting or notching of Tanalised® Timber should be further protected with an approved brush-on end grain preservative to maintain the integrity of the preservative protection.
The Tanalith® E Treated Timber User Guide provides further information on post-treatment machining and installation. To download a copy, click here.
Tanalith® E treated wood waste is not classified as hazardous. Following local market regulations across Great Britain, the timber can be disposed of at the local waste recycling centre. Please note the following:
- Tanalith® E treated timber and post treatment processing wastes, such as sawdust and offcuts, must not be used for animal litter or bedding or for fuel in barbecues, cooking stoves or grates.
- Do not burn preservative treated wood.
- Do not use preservative treated wood as mulch and do not compost.
- Domestic end users should dispose of any waste treated timber and sawdust through the ordinary waste collection service or at a local authority amenity/disposal site.
- Any waste timber, sawdust or redundant timber from commercial or industrial use (e.g. construction sites) should preferably be recycled by re-use or disposed of to an authorised landfill or to a correctly controlled and approved waste incinerator.
Timber treated with Tanalith® E is suitable to use for structures in and around children’s play areas. Tanalith® E is authorised under the GB BPR Biocidal Products Regulation EU 528/2012, having been rigorously assessed for its impact on human and animal health, as well as the environment.
Please refer to the Tanalith® E Treated Timber User Guide for more information on the use of Tanalised® timber, click here.
Tanalith® E pressure treated timber has a long-life expectancy and it is appropriate to use metal fixings and fastenings that will have a comparable length of life. Performance of metal fixings is influenced by the environmental conditions including moisture content, temperature, atmospheric pollution, proximity to coastal locations, timber species, as well as the thickness of any galvanising.
The Tanalith® E Treated Timber User Guide provides full details on the types of suitable fixings – download a copy here
Wood preservatives can be applied in a number of ways, depending on the end-use application of the timber. At Hales, we use Tanalith® E which is industrially applied through a high-pressure process in a purpose-built treatment tank. When impregnated into the timber through a high-pressure process, Tanalith® E components bond with the wood structure and cannot easily be removed, helping to significantly extend its service life.
The term ‘green treated timber’ when used in the context of pressure treated wood, is that which has been treated with a water-based copper wood preservative in a high-pressure vacuum process. At Hales, we use Tanalith®E wood preservative which, like all water-based copper treatments, gives the treated timber an initial natural green colouration. Upon external exposure, the initial green colour of Tanalised® timber slowly weathers to a warm, honey brown and in the longer term becomes a natural silver grey. This weathering process does not indicate any loss of preservative protection.
Brown treated timber is treated timber with a built-in brown colour. We use Tanatone®, a brown colourant that is compatible with Tanalith® E, and added to the high-pressure impregnation process. Tanalised® timber with built-in colour is recommended for fencing and landscaping timbers – Use Classes 3.2 and 4. As with all colour applications to timber, the colour treatment will fade with time (usually within 12 months). If required, the colour can be refreshed with a brush-on colour product (always follow the coating manufacturer’s full recommendations).