WJ Components

• About Timber Treatment
• HP-Wolmanit® CX-10
• Wolmanit Firestop
• DV-Wolsit® KD-20
• Timber Treatment Process
• Maintenance
• Colours
• Preservative Performance
• European Standards
• Treated Timber Handling
• Re-working of Treated Timber
• Service Life
• Tracing Timber Packs
• Health, Safety & the Environment
• Timber Usability
• Timber Treatment FAQs
• Get A Quote

Timber Treatment Process

To ensure we can meet your requirements, WJ Components needs the following information:

1. Type of timber. For example, spruce/pine, the dimensions being used, whether it is planed, sawn, green and/or seasoned.
2. The Use Class, i.e. what the timber is being used for – see the table below. The greater level of protection required, the higher the Use Class number.

Use Class Summary

Pressure Treated Redwood Sample - reagent applied to show chemical penetration in sapwood.

The light area in the centre is the heart wood of the tree which is naturally durable and does not take up any treatment chemical. The outer darker area is the sapwood (new growth) that is not naturally durable and this is the part of the tree that will rot if not treated.

The amount of chemical retained in the sapwood area determines the Use Class achieved during the treatment process.

3. Service life considerations - Does the timber need to be used for 5, 15, 30, or 60 years? Are there any special factors regarding the use of timbers which may suggest a higher level of protection than normal is required?

WJ Components will then recommend the type of treatment necessary for the timber. Treated timber always requires a minimum of 24 hours for the timber to dry out and will only despatch timber once it is dried sufficiently. Ideally, treated wood should be left to ‘cure’ for 14 days before being placed in ground contact.