Barlows Woodyard

All that is good in wood,
at home or in the garden

Newbury 01635 200253
Witney 01993 881206
 Basket        Honeystreet 01672 851565

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. Next generation TANALISED pressure treated timber can be used with total confidence in Use Classes 1 - 4.
Always ask your supplier which Use Class the timber is treated to, particularly for ground contact applications.
Use Classes – BS EN 335-1
UC 1 - Internal, dry (eg. Upper floor joists)
UC 2 - Internal, risk of wetting (eg. Tile battens)
UC 3 coated (3.1) - Outdoors, coated, above ground (eg. Soffits/Cladding)
UC 3 uncoated (3.2) - Outdoors, uncoated, above ground (eg. Cladding/Fence rails)
UC 4 - Direct soil or fresh water contact (eg. Fence posts)

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