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Tanalised wood is where the treatment process is carried out by placing the timber in a big tank. The door is shut and a vacuum is created inside it. Then the pressure treatment fluid is allowed to enter and is forced in the wood under the pressure. It penetrates to a depth of a few millimeters.
The main ingredient is copper with other chemicals added. Copper is excellent for protection against rot and insects. The other chemicals (Biocides) protect against other rot that the copper can’t, such as ‘brown rot fungi’. These substances are not harmful at all and can be used around animals and children.
It does exactly what it says and protects the timber from rot really well. Internally it will last about 60 years and externally about 30 years against any form of rot.
Initially the timber wil be a light green colour which will weather to a light honey brown and eventually to a natural silver grey.
This change of colour is not any indication of loss of preservative protection. Subsequent decorative finishes can be added to create the look you desire.
6 foot depth, 12 foot width, eave height 1820mm, ridge height 2040mm