The move is another example of a growing level of new investment by timber sector companies as timber import and sales volumes continue to grow in response to improving demand in the construction sector.

The Hull-based treater has installed a 10m-long low-pressure tank at its facility on the Scotline Rochester Transit site in Kent to complement its existing two high pressure treatment vessels, opened there in a £200,000 investment late in 2012.

It said the move would ensure southern-based timber companies have a flexible treatment service for all their requirements.

WJ Group, which uses BASF-Wolman treatment products, says demand for treated timber has been strong ever since it opened the Rochester facility.

And the company’s managing director Mark Eggleston said he was ultimately keen to expand the site further so it offered the same package of services as the Hull operation. This includes plans to offer fire retardant treatment services and anti-slip timber decking.

"Rochester is an excellent site to offer comprehensive timber treatment facilities, given the amount of timber coming into the port and the number of timber companies in the area," said Mr Eggleston.

"We intend to make use of our expertise in added-value timber services to expand Rochester and the addition of a low-pressure treatment tank there is a solid step in the right direction."