Treated Lumber Classifications: What You Need to Know - Decks …
网页2020年7月15日 · 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.
Pressure Treated Wood: Types, Grading Standards & More
网页2007年7月16日 · 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.
What is the Best Pressure Treated Wood for Ground Contact?
网页2021年11月13日 · The best treated lumber levels are UC4A and UC4B since the AWPA designates them for ground contact service conditions. UC4A is typically used to construct fences and decks, making it an ideal treated wood for building a backyard deck that will contact the ground.
Types of Pressure-Treated Wood - The Home Depot
网页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. Must be used when lumber is less than 6 inches from the ground or has poor ventilation.
Pressure Treated Lumber Grades, Types, and Uses Explained
网页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. Pressure treated wood used for in-ground or critical use has a greater retention level than timber used for above or ground contact.
What’s the Difference: Pressure-Treated Lumber
网页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. Until 2004, pressure-treated wood for residential use was preserved with chromate copper arsenate (CCA), and the level of treatment was generally the same for all lumber.
UC3B or UC4A? Treated Lumber Classification Continues to Confound
网页2017年6月29日 · Pro deck builders seem to have a good handle on the differences between above-ground (AWPA UC3B) and ground-contact (AWPA UC4A) pressure-treated lumber. But general contractors and DIYers? Not so much, according to a recent report from Spectrum Consulting .
Ground Contact Pressure Treated Lumber - Lowe's
网页If you’re using pressure treated lumber for something that’ll touch the ground, such as a deck post or fence post, make sure it’s rated for ground contact. Find 2 by 6 treated lumber, treated 6 by 6 posts and other common sizes at Lowe's.
New Rules for Pressure Treated Lumber - Pro Remodeler
网页2016年4月5日 · Most builders and remodelers use pressure treated lumber to build exterior decks, and the AWPA standard effectively matches retention to where in the structure the wood is used. Currently, lumber rated for ground contact is typically used for posts and grade beams, while lumber rated for above-ground use is used in the rest of the structure.
A Deep Dive into Grades of Pressure Treated Lumber: Your …
网页2023年9月22日 · Pressure-treated wood comes with lumber grades from Number 1, Number 2 to Number 3. The higher the grade, the fewer the defects. These defects come in splits or knots. This article will explore more on the lumber grades and their significance.