Treated Lumber Classifications: What You Need to Know - Decks …
Jul 15, 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.
What is the Best Pressure Treated Wood for Ground Contact?
Nov 13, 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.
Can pressure-treated wood touch the ground?
May 23, 2023 · Wood treated with preservatives that meet the AWPA GC (Ground Contact) rating is suitable for direct contact with the ground. This type of pressure-treated wood typically has a higher concentration of preservatives, which enhances its resistance to moisture and decay.
Pressure Treated Wood: Types, Grading Standards & More
Jul 16, 2007 · Treated lumber rated for ground contact can be partially destroyed by termites in less than five years. There are many factors that weigh into why some treated lumber lasts longer than pieces that fail.
Pressure Treated Wood Buying Guide at Menards®
MicroPro® AC2® pressure-treated wood products are available for above ground (AG), ground and in-ground contact (GC), and critical structural (CS) applications. The ratings are based on …
Types of Pressure-Treated Wood - The Home Depot
Ground-contact pressure-treated wood: Ground-contact pressure-treated lumber can be used either above ground or in contact with the ground. Has twice the level of chemical retention and protection compared to above-ground treated wood.
Pressure Treated Lumber Grades, Types, and Uses Explained
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
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.
What’s the Difference: Pressure-Treated Lumber
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
For Code Officials - AWPA
For wood products used outdoors and in ground contact, copper naphthenate in products such as Copper Green, CopperCoat, or QNAP are used to treat cut ends and drilled holes. Copper naphthenate may also be found online on websites such as …