Treated wood can last more than 40 years. Severe Weather Ground Contact pressure treated exterior wood protected with Micronized Copper Azole (MCA-C) with BARamine provides lasting support and protection for all-purpose applications . Knots may not be larger than 2 ¾". 6x6s for support posts and plywood. By clicking GO!, you acknowledge that you have read Trex's, Cedar Decking: Prices, Different Types, Maintenance & More, Redwood Decking: Cost, Maintenace & Types of Redwood, Common Wood Defects: Types & Causes of Lumber Issues, Pressure-Treated Wood: Types, Grading Standards & More, ACQ Alkaline Copper Quaternary (Type B or C), ACQ Alkaline Copper Quaternary (Type A or D), PTI Propiconazole-Tebuconazole-Imidicloprid, SBX Inorganic Boron (non-Formosan termites). Above-ground lumber is treated to a lower standard of resistance. As the names suggest, ground-contact lumber is treated to a standard to withstand rot and decay even at the point where the lumber physically touches the ground, water or leaves. A beat-up, decayed 2x8 covered in knots won’t be as strong as a clean, straight-grained one. It is strong and stiff. Before 2003, when manufacturers voluntarily stopped treating lumber intended for most residential uses with copper chromium arsenate, CCA-treated lumber was widely available in a single formulation that was rated for ground contact use. Different applications impose different hazards on wood, and require different amounts of preservative for protection. fence and deck posts)UC4B: Exterior use, heavy contact with ground (e.g. Do-it-yourselfers know it. There's nothing like ProWood lumber and products from UFP Industries. There are several tried-and-true methods for treating lumber that have been developed in the construction building industry. Has twice the level of chemical retention and protection compared to above-ground treated wood. Pressure-treated lumber is ideal for outdoor construction as it has a long, useful life span and is much less expensive than alternatives. Above ground treated wood remains International Building Code (IBC®) and International Residential Code (IRC®) compliant for most deck projects under Section R317.1 and Section 2303.1.9 respectively. CCA use has been reduced, so you’re more likely to … The moisture content at the time of milling, this rangesfrom (AD) air dried or (S-GRN) surface green, with a moisture content of 19% ormore to (KD) kiln drie… August 18th 2017 How to Properly Choose Treated Wood . #2 lumber, also called standard, has a rougher, knottier look. The wood is manufactured for ground contact, so having it touch the earth is not specifically a defect. Choosing the Right Type of Pressure Treated Wood. ProWood ® products are available in Ground Contact (UC4A) standards: 5/4-inch decking; Dimensional lumber; Plywood; Appearance-grade boards; Find ProWood … Ground-contact pressure-treated wood: Ground-contact pressure-treated lumber can be used either above ground or in contact with the ground. 5/4x6s and 2x6s for decking. AWPA U1 UC3B Above Ground, Exposed 0.27 pcf EWP-A (Excellent Wood Preservative, Type A) 2 x 6 - 12 #1 SYP AWPA Standardized Preservative ICC-ES Evaluated Preservative ABC Treating Company Anytown, USA 5 4 2 7 10 10 1 3 7 6 11 EWP-A 0.15 pcf GROUND CONTACT – GENERAL USE ESR- 0 6 Agency Agency 9 9 8 Grade Marks and Qualit y Marks The lumber association with a mark or logo. For superior durability. 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. In modern time pressure treated wood is stamped to indicate how much ground contact levels can be achieved. It encompasses a group of western species. Many lumberyards stock treated wood in the broad category of > or better. Southern Yellow Pine can be treated in a variety of ways to add to its durability against the elements. This is stated on the tag stapled to the lumber's endgrain. UC3B treated lumber is for above ground, not for near ground, light-duty use ; UC4A treated lumber is for ground contact, general use ; UC4B treated lumber is for ground contact, heavy-duty use . That's why we offer two types of treated wood with preservatives specifically designed for each application. For decks and docks of all kinds, many contractors choose UC4B and UC4C for the decking and framing. Viance provides an extensive range of advanced wood treatment technologies and services to the wood preservation industry. Wood can be impregnated with a variety of preservative chemicals to prevent rot and insect infestation in exterior applications like decks. 4. This is very typical of most deck structural posts, beams and joists. Grades of pressure-treated wood are numbered to indicate that amount of preservative per board foot. There are a handful of species commonly used for structural framing, and while relatively similar, their properties affect how far they can span as joists. Douglas Fir – It is very strong and is less prone to warping and spitting than SYP. 29 Dec. 2011. Pressure-treated wood in contact with the ground needs the most protection, and will rot in just a few years if you use the wrong grade. Species like southern pine and douglas fir are often used for deck framing. Pressure-treated lumber will often bear an AWPA Use Category (UC) mark: UC1: Interior use, not in contact with the ground (e.g. Pressure-treated lumber is divided into two grades, #1 and #2, based on the appearance and composition of the wood. The face-off between the two was sparked when the American Wood Protection Association rewrote its guidelines identifying which type of pressurized … PTI pressure treated wood products are relatively new to the market place and are not yet widely available in building supply stores. Grade is a description of the quality of a given species. Home Depot Pressure-Treated Pine meets the highest grading standards for strength and appearance. Pressure-Treated Wood: Types, Grading Standards & More ... Unbranded 2 in. #2 lumber, also called standard, has a rougher, knottier look. Here are a few tips when building a pressure treated timber retaining wall. N.p., n.d. #1 lumber, also called premium, is the higher grade, with very few knots, warps, or other blemishes. For outdoor projects, it’s important to understand the difference between Ground Contact treated wood and lumber designed for Above Ground use. Learn more about pressure treated lumber. We’ll teach you the types of pressure treated wood. Copyright © 2020 Trex Company, Inc. All rights reserved. #1 lumber is usually used for applications where appearance matters, while #2 lumber is used where it will not be visible on the finished product. The strength and properties of lumber from different species of wood varies considerably. SYP logs yield a high proportion of sapwood, which works well to absorb preservative. Since most pressure-treated lumber is used where moisture is present (outdoors, crawl spaces and basements) the perfect storm for galvanic corrosion was created. The material species, (SYP)Southern Yellow Pine, (DFir) DouglasFir, (RD) Redwood, etc. Species & Sizes Of Pressure-Treated Wood Treated wood is generally available as dimensional stock in 2x4s, 2x6s, 4x4s and 2x2s for rail components. What Is the Density of Pressure Treated Lumber. Pressure-treated lumber is rated by the amount of chemical infused in it per cubic foot of wood. Lumber that is rated for ground contact has more preservatives than above ground lumber, so it'll last longer when it's in contact with soil. Predominant material found in western U.S. and Canada. Be sure to obtain wood treated for the application you have in mind. Experienced contractors know that you need to have lumber that is certified for “ground contact” or higher for humid, harsh, or near water applications. The intended use is identified on the tag stapled to each piece of lumber. Paint thinner. Must be used for applications where wood is difficult to maintain or … 2x8s, 2x10s and 2x12s for joists, stair stringers and beams. There are exceptions to this, such as foundation grade lumber and plywood, which needs to be dried to a moisture content of no more than 19 percent for lumber and 15 percent for plywood. Ground-contact wood can be installed underground and should not harm … Roofing tar. Let’s go into why that’s important. 6x6s for support posts and plywood. Preservative-treated wood is typically pressure-treated, where the chemicals are driven a short distance into the wood using a special vessel that combines pressure and vacuum. At Lowe's, it's important to provide high-quality treated lumber. Our wood is approved for exposure to water, weather, and for ground contact. Not suitable for deck construction. This double treated Ground Contact lumber must be used for applications where treated lumber is difficult to maintain, repair or replace. furniture)UC2: Interior use, possible exposure to damp (e.g. The current revisions are another chapter in the decade-long struggle to find … 8-ft. 6-ft. 10-ft. 12-ft. 16-ft. 8-ft. Common Length Measurement. One hole is permitted every 2 ft. Wane corners. When using lumber underground, you should always apply preservative to the lumber to prevent rot and termite damage. 4-in x 4-in. Marine Treated Wood/Seawall Grades Marine treated lumber, timber and piles are pressure-treated with higher concentrations of Wolman®CCA preservative to withstand the harsh exposures and destructive organisms common in marine environments.Retention levels range from 0.40 pcf for soil contact to 2.50 pcf for saltwater immersion. Roller or brush. Web. Must be used when lumber is less than 6 inches from the ground or has poor ventilation. Use Category Brief Description UC1 Interior Dry UC2 Interior Damp UC3A Exterior Above Ground, Coated with Rapid Water Runoff UC3B Exterior Above Ground, Uncoated or Poor Water Runoff UC4A Ground Contact, General Use UC4B Ground Contact, Heavy Duty UC4C Ground Contact, Extreme Duty UC5A Marine Use, Northern Waters (Salt or Brackish Water) UC5B Marine Use, Central Waters (Salt or Brackish Water) UC5C Marine Use, Southern Waters (Salt or Brackish Water) UCFA Interior Above Ground Fire Protection UCFB Exterior Above Ground Fire Protection. #1 lumber is usually used for applications where appearance matters, while #2 lumber is used where it will not be visible on the … To obtain the maximum performance out of your treated wood for any outdoor project, you need to choose material that is appropriate for the conditions in which it will be used. Code Compliant Above Ground and Ground Contact Treated Wood. 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