The eventual end use of preservative treated timber is classified into one of the five main categories shown in the table below. These Use Classes, defined in BS EN 335-1, are based on the potential threat to the timber from decay or insect attack in its eventual application.
For instance, internal building timbers in Classes 1 and 2 will be under less threat than timbers used externally in ground contact - Use Class 4. Therefore, Use Class 4 timbers will require a higher degree of protection.
The illustration below shows the typical applications for treated timber
Normans provide a fully comprehensive range of products and materials to the building industry in Jersey, with two locations, one at Commercial Buildings the other Five Oaks.
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Norman Limited, 19 Commercial Buildings, St Helier, Jersey, Channel Islands, JE1 1BU