Building

use class 4
Use Class 4 treated timber: specifying, buying and installing
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Preservative treatment provides wood with added durability (against decay and insect attack). But, it’s a mistake to assume that all treated wood is the same. The level of preservative protection required depends on where it is to be used.
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Developed by the Construction Products Association, CCPI is in response to one of the key findings of the enquiry into the Grenfell fire which confirmed that shortcomings in product information had contributed to the disaster.
Code for Construction Product Information (CCPI)
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The UK is raising the bar on performance information supplied with construction products with Isuue 1 of the CCPI, published in September 2021.
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The WPA Code of Practice for Industrial Wood Preservation (January 2021) groups the applications for treated wood into Use Classes.
The Buyer’s Guide to Preservative Treated Wood
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The WPA Code of Practice for Industrial Wood Preservation (January 2021) groups the applications for treated wood into Use Classes
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Use class 4
Understanding Use Class 4 (UC4)
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Consumer and contract law require that any product offered for sale must be fit for its intended use and a wood product impregnated with preservative is no exception. The minimum standards for the treatment of wood are set out in British Standard BS8417 (Preservation of Wood: Code of Practice). In...
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Use class 2
Understanding Use Class 2 (UC2)
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Consumer and contract law require that any product offered for sale must be fit for its intended use and a wood product impregnated with preservative is no exception. The minimum standards for the treatment of wood are set out in British Standard BS8417 (Preservation of Wood: Code of Practice). In...
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Use class 3c
Understanding Use Class 3 c (Coated) UC3
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Use Class 3 is for end uses where wood is used outdoors NOT in contact with the ground.
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