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Specification
Guide
Use Class (previously Hazard Class) is the new classification
for measuring the level of preservative treatment required for timber
depending on its eventual end use and its risk of attack. The
main difference between the classifications is the addition of a Use
Class 3A and 3B. At Glenavon we treat all timber within this classification
to Class 3B.
Have a look at our diagram below to see
the necessary treatment required for different uses of timber.
The
Hazard Class (HC) |
The
Use Class (UC) |
Service
Life |
HC1
- Internal Dry, with insect risk HC2 - Internal, with risk of wetting HC3 - External, above ground level and with wetting HC4 - In ground or fresh water |
UC1
- Above ground, covered. Permanently dry, insect risk. UC2 - Above ground, covered. Occasional risk of wetting. UC3a - Above ground, coated. Exposed to frequent wetting. UC3b - Above ground, uncoated. Exposed to frequent wetting. UC4 - In contact with ground or fresh water. Permanently exposed to wetting. |
1 or 2 ..... 60 yrs 3 ..... 30 yrs 4 ..... 15 to 20 yrs |