Embracing treatment in technology

Traditionally timber treatment has used solvents to dissolve the copper in the water-based timber preservatives but we've moved over to a later generation of timber treatment that uses micronised wood preservative technology.

We've done this because the micronised copper and organic co-biocides have certain product features and advantages, such as low VOCs, setting new environment benchmarks; a lighter, consistent 'natural' colour to the treated wood; improved leaching characteristics; and improved corrosion protection for metal fasteners and hardware.

It is a popular treatment choice in the US and a proven method of manufacturing high-pressure industrial wood preservatives.

At John Brash we are continually searching for ways to move forward and use the latest technology, especially where there is an added environmental benefit.

The composition of the preservative with the new technology makes it a more environmentally sound choice, both for the finished product and manufacturing process. We've been working with Osmose to develop the micronised treatment, MicroPro, and optimised it for the treatments to Use Classes 2 and 3; ideal for roofing battens and most timber decking.

By removing all solvents, the new treatment is VOC free; it makes compliance with the Industrial Emissions Directive a little more straightforward.

This is a big advantage for production; it will deliver significant operational efficiencies in the production process. Better fixation of the preservative and reported faster drying times are also benefits of this type of treatment.

The change to the new treatment method has perhaps the greatest benefits for western red cedar shingles.

Previously, the traditional preservative treatment affected the appearance of the shingles, but now there is virtually no change to their natural colour. They will maintain a 'clean' appearance but with the benefit of preservative treatment and the guaranteed life span.

Timber decking previously resulted in a 'green' look after treatment. However, with micronised treatment, timber decking will also have the appearance of 'clean' timber but with a very faint green wash. This will weather to an initial natural golden colour and on towards a honey colour, before weathering to silvery grey. Therefore the weathering process is more gradual and even.

With decking, another environmental benefit is that leaching is reduced. This can be important when building over watercourses and on balconies.

As with decking, traditional wooden battens will look very much lighter in colour. The lack of solvent reduces any possible problems with surfactants and roofing underlays.

This type of preservative treatment still meets BS 8417:2011 and carries all the same warranties and guarantees. It's important that all timber treatment is carried out by a WPA Benchmark accredited timber treater and all products are part of the Benchmark QA Scheme.

All John Brash's products moved over to the new treatment from September 1. For us it means better-looking products, with the same preservative benefits and a more cost-effective, sustainable production process.