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Bond Timber 01503 240308
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Plant Hire & Sales 01579 383185
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Contact  Bond  Timber:  01503  240308

Timber
Treatment & Milling

Treated Timber

Arch Chemicals latest Auto-Treater technology installed

Tanalith E
Vascol Aqua – Vac Vac

Tanalith E Silver service


UC4, suitable for all in ground timber such as fencing posts and stakes

Tanalith E Gold Service


Stronger treatment offering a better lifespan of 30 years for in ground contact timbers
Sector Scheme 4 – Highways Specification
We are pleased to be approved WPA treaters for SS4 timber. Required for all motorway and A road work. We are able to offer this treatment from our large vessel at Trerulefoot. Certificates produced and delivery available nationwide

What makes a Quality Timber Treatment?

Preservative pressure treatments will significantly extend the service life of agricultural and fencing timbers by providing an effective protection against all forms of wood decay and insect attack. Carried out in industrial treatment vessels by trained operators, treatments use a proven process of pressure and vacuum cycles to impregnate the wood preservative deep and permanently into the timber cells. Next generation TANALITH E wood preservative and the resulting next generation TANALISED pressure treated timber provide the best quality performance results for your agricultural and fencing timbers.

Since 2003, ‘latest generation’ products have been introduced by preservative suppliers to replace the traditional CCA (chromated copper arsenate) based formulations, which are now no longer permitted for use in Europe. These ‘latest generation’ products, commonly known as ‘copper organics’, have very different performance credentials to each other. Therefore, let’s ask the questions ‘what makes a quality timber treatment?’ and ‘whether you are getting what you expect from your treated fencing and agricultural timbers?’

There are 4 main elements to be considered by any company providing
a quality timber treatment:

  • + What species of timber is being treated?
    - What species of timber is being treated?

    All timber species have their own characteristics with some more suitable for certain end uses and some easier to preservative treat than others. For the fencing and agricultural markets in the UK, the main species are Spruce (whitewood), Pine, Larch and Douglas Fir (redwoods), because of their abundance and availability. All these species are used by treatment companies, more often than not sourced from recognised sustainable resources. These species can all be given an effective preservative pretreatment for both in and out of ground contact applications to provide an effective protection against the threat of decay and insect attack. Increasingly, treaters are offering fencing posts manufactured from Pine, Larch and Douglas fir, as these species will more readily accept preservative treatment.

    Bond Timber use only Redwood species for our ground contact timbers (Use Class 4) to achieve the best level of protection. Spruce is only used for out of ground contact timbers (Use Class 3).

  • + How well is the timber prepared prior to treatment?
    - How well is the timber prepared prior to treatment?

    All harvested timbers have a moisture content – a measurable level of water within the wood.

    This moisture content should be at a specific level to allow the wood preservative to penetrate sufficiently during the pressurised treatment process. Therefore, freshly harvested timbers have to be dried down to reduce the initial moisture content – usually to around a minimum of 28%. Also, if the timber is dried prior to treatment, it is much less likely to ‘split’ in service.

    From a treatment point of view, the most economical way of achieving this moisture content reduction is by natural air drying methods.

    Harvested timbers can be held in stock, both prior to and after machining, to let the moisture content reduce to the required level. Careful rotation of timber stocks will also prioritise the use of older and drier stocks for treatment. Some companies also utilise kilning to carefully dry their timbers down to the correct moisture content, ready for treatment.

    Bond Timber use some kiln dried timbers but also air dry stocks down to around 25% moisture content prior to treatment. We also carefully manage our timber stocks, using the older and drier stocks first.

  • + How effective is the wood preservative?
    - How effective is the wood preservative?

    All ‘latest generation’ wood preservatives are different to each other and have different performance credentials. Unlike some European countries, all that was previously needed to place a new timber preservative onto the market in the UK was to prove its performance through a series of laboratory tests. However, can this be a true test, particularly when treated fencing and agricultural timbers are used externally and often in ground contact situations – the most extreme test for timber? TANALITH E wood preservative is a unique formulation product from Lonza Wood Protection, world leaders in timber treatment technology. Field tests by Lonza and independent bodies have demonstrated the unrivalled performance of TANALITH E around the world to achieve the optimum protection for external, ground contact timbers. This is combined with an excellent commercial track record of TANALITH E dating back to 1999 in the UK and even longer across mainland Europe. It is now the preferred preservative in over 35 countries around the world. It is this performance record that underpins the superior performance of TANALISED pressure treated timbers.

    We are also now using the next generation TANALITH E wood preservative in our treatment operations. This latest wood preservative from Lonza now also incorporates patent pending BARamine technologies which provide an even more robust protection against certain copper tolerant brown rots as well as allowing a more even and consistent distribution of the wood preservative into the timbers.

    Bond Timber utilises next generation TANALITH E wood preservative in our own treatment facilities. It provides a real assurance and confidence in the treated timbers we supply.

  • + How professional is the treatment process?
    - How professional is the treatment process?

    The level of preservative treatment given to timber can be varied according to its eventual end use. Within the industry there are Use Classes, which define the typical end use of the timber and the appropriate level of preservative protection required. The main Use Classes range from 1 to 4. Timbers that require the least level of protection, for instance internal building timbers, where there is no chance of wetting, are considered as Use Class 1. External timbers, which are permanently exposed to the weather and could be either used in or out of ground contact, require a higher degree of protection and are designated in Use Class 3.2 (external, out of ground contact) and Use Class 4 (external, in ground contact).

    Timber treatment plant operators should be fully trained, and will ensure treatments for fencing and agricultural timbers are carried out to meet either Use Class 3.2 or 4, to give a minimum desired service life of 15 years.

    The Bond Timber treatment plant operators are fully trained up to an advanced NVQ level. We also offer a choice of silver or gold treatment levels for either a 15 or 30 year desired service life for our ground contact timbers. Bond Timber is now independently accredited by the Wood Protection Association for the WPA Benchmark Quality Scheme for treated wood. This accreditation confirms our treated timbers have been produced to conform with industry standards and are fit for purpose. Bond Timber is also Treat-Right accredited by Lonza for its quality treatment procedures.

Use Class Summary
1 INTERNAL, dry eg. upper floor joists
2 INTERNAL, risk of wetting eg. tiling battens
3.1 OUTDOORS, coated above ground eg. decorated cladding
3.2 OUTDOORS, uncoated above ground eg. fence rails
4 DIRECT SOIL OR FRESH WATER CONTACT eg.fence posts
4 HIGHWAYS AGENCY TIMBERS

Using Timber Correctly

Finally, just like any product, treated timber has to be used correctly. With exterior fencing and agricultural treated timbers, there are a few considerations which are particularly important at the installation stage that you or your fencing contractor should note.
Any cuts or notches made to the treated timbers must be treated with ENSELE brush-on end grain preservative to maintain the integrity of the protection. ENSELE is available from Bond Timber in either 1kg or 5kg cans.

  • Only timbers treated to Use Class 4 requirements can be used in ground contact situations.
  • Use Class 3.2 treated components – fence rails, fence boards, gates, Yorkshire boarding – should only be used for out of ground contact situations.
  • Fence posts must not be pointed after treatment.
  • The shortening of fence posts should be avoided, whenever possible. If unavoidable, the cut end must be treated with ENSELE end grain preservative and must never be used in ground contact.
  • Any pressure treated timbers which are further processed, eg. planed or ripsawn, must be returned to Bond Timber for re-treatment. Treated timbers should not be removed from their original installation and re-used at a new location.

We have facilities on site to re-saw and cross cut timber as well as plane and produce mouldings. We are also able to cut plywood on site.

To find out more about Tanalised timber go to www.tanalisedtimber.co.uk

Download the ‘What makes a Quality Timber Treatment’ .pdf guide.

For more information on this product or any of our timber products call us on 01503 240308

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These timber products can be purchased from our Saw mills in Saltash and Devon
- How to find us

All our timber products are certified by the following organisations

bond timber certifcationa PEFC FSC

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