Southwest Fencing Contractors

We use treated timber sourced through a local saw mill, felled from 65% re-newable sources.
The wood is treated using a chemical called "Wolmanit CX" - a water based concentrate using 4.95% w/w boric acid, 15.97% w/w copper carbonate hydroxide and -
3.42% w/w bis-n-(cyclohexyldiazeniumdioxy)-copper as the active ingredients.

The process:

There are two basic types of industrial treatment and a range of processes depending on the timber species to be treated, the end use of the treated timber, and the type of wood preservative to be applied. Vacuum pressure processes are designed to achieve maximum penetration possible (penetration varies from species to species) of the cross section of the timber by the preservative liquid giving a high level of protection, such as is required for timber used in ground contact.

In double vacuum / low pressure processes the requirement is to give a protective envelope of treatment around the timber. This type of process is used to treat timbers where the biological hazard to the treated timber is less severe, e.g. window frames, than for timbers that are vacuum pressure treated.

The benefits:

The correct amount of wood preservative has been applied to the timber in a controlled industrial process, designed for the intended end use of the treated timber. Different end uses and service life expectations will require different loadings of wood preservatives in the timber.
There is no wastage of the wood preservative or loss to the environment during the application of preservative to the wood. Treatment of timber by an industrial process reduces the potential for human and environmental exposure to the preservative chemicals.