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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
15 lip 2020 · Experienced contractors know that you need to have lumber that is certified for “ground contact” or higher for humid, harsh, or near water applications. These treatments help protect lumber from rot, moisture, and burrowing pests—and to prevent the treatment in your lumber from seeping out into the environment.
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.
The labels for these products, however, usually just state “above ground,” “ground contact,” or “ground contact/freshwater use,” which correspond to progressively higher retention levels. AWPA minimum retention levels (in lb. per cu. ft.) Preservative: ACQ. Above ground: 0.15. Ground contact: 0.40. Ground contact, heavy duty: 0.60
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.
23 wrz 2020 · Ground contact: A piece of lumber that has been treated so that it effectively retains the chemicals used to preserve it is safe for “ground contact.” Ground contact pressure treated wood can last for up to 40 years, even under wet conditions.
Treated timber is classified into various levels based on the amount of protection it offers against decay and insect infestation. The most commonly used grading system includes: Use Class 2, Use Class 3, and Use Class 4. Each timber use class corresponds to a specific level of treatment and recommended applications.
