Vascol Aqua – Vac Vac
Tanalith E Silver service
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
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:
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).
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.
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.
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|
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.
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.