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Preservative Use Class

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Preservative Use Class

The choice of treatment depends very much on the eventual end use of the timber, the timber species and consequently, its risk of fungal decay or insect attack.

TANALISED E treated timber is generally used for medium to high risk end use applications, and VACSOL treated timber is used for low to medium risk end uses.

Download our Choice of Treatments document for specifiers

British and European Standards refer to Use Classes (previously Hazard Classes) for the preservative treatment of timber, based around its eventual end use and its risk of attack.  The level of preservative treatment is varied according to the Use Class situation that the timber is exposed to during its life. A greater degree or protection is required as the Use Class increases.

USE CLASS (UC) SUMMARY

UC 1	—	Internal, dry – for example upper floor joists
UC 2	—	Internal, risk of wetting – for example tile battens
UC 3.1	—	Outdoors, coated, above ground – for example window frames
UC 3.2	—	Outdoors, uncoated, above ground – for example fence rails
UC 4	—	Direct soil or fresh water contact – for example fence posts
UC 5	—	Marine use – for example marine pilings