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Ground (UC3B) and Ground Contact (UC4A) use conditions for treated wood. As part of the standards process, the AWPA standards define situations where pressure preservative treated lumber may be physically above the ground, but have conditions that would approximate ground contact hazards.
Pressure treated wood for ground contact commonly has twice the chemical retention level as above ground rated lumber. UC3B or UC4A are best for ground contact use. In-Ground Contact for Critical Use
16 lip 2007 · Pressure treated wood is lumber impregnated with a variety of preservative chemicals to prevent rot and insect infestation in exterior applications like decks and fences. Several species of wood can be treated, but a regionally available species usually predominates in any particular locale.
15 lip 2020 · UC4B lumber is suitable for ground contact and contact with freshwater. It is also durable enough to be used for “critical construction” projects, such as utility poles. AWPA U1 signifies that the wood has been treated according to AWPA Standards.
13 lis 2021 · The best pressure-treated wood for ground contact or within 6″ (150mm) is wood classified as UC4A or UC4B. Often lumber companies will make this easy by tagging the wood as treated for ground contact.
Western preserved wood products are commonly available pressure-treated with the following waterborne preserva ves: CA - Copper Azole Brands: Wolmanized® Outdoor® Wood, Preserve® CA, NatureWood® CA Species: Douglas Fir, Hem-Fir Use: Above ground, ground contact, fresh water contact, salt water splash
Learn more about the various types of pressure-treated lumber, where you can find the retention level, and why making the right choice is so crucial.
