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pressure treated wood grades for ground contact

When using lumber underground, you should always apply preservative to the lumber to prevent rot and termite damage. The treatment process involves placing a load of lumber in a huge cylindrical chamber called a retort with a door on one end that can be sealed airtight, and then forcing waterborne chemicals into the wood under pressure. Viance has a 30-year history of innovation and continues to develop environmentally advanced solutions that improve the performance and durability of wood products. 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… The strength and properties of lumber from different species of wood varies considerably. The preservative retention for both CCA- and ACQ-treated lumber is .25 for above-ground applications and .40 for ground contact. The numbers depend on the chemical preservative used in the treatment. This is very typical of most deck structural posts, beams and joists. #1 lumber is usually used for applications where appearance matters, while #2 lumber is used where it will not be visible on the … Most common are: Southern Yellow Pine - Southern pine is the most common deck framing material in the eastern United States. Several species of wood can be treated, but a regionally available species usually predominates in any particular locale. The grade of the wood, there are a number of grades,Select (the best quality and strongest) to Utility (the lowest quality and leaststrength). This is stated on the tag stapled to the lumber's endgrain. Not suitable for deck construction. 4-in x 4-in. The ratings are based on the amount of preservative used to treat the wood. 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. It is possible that some boards will become so deformed that they will be unusable. beams, flooring)UC3A: Exterior use, above ground, protected from damp (e.g. Number 2 - Grain slope must meet minimum 1/8 grain slope. Wood that is stamped L P22 means it contains arsenic, therefore it’s most toxic and can be used for applications involving direct contact with the ground. Pressure-treated lumber is divided into two grades, #1 and #2, based on the appearance and composition of the wood. 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. Check it to find the type of preservative used. It has a high consistency and the appearance is very good. The current revisions are another chapter in the decade-long struggle to find … Be sure to obtain wood treated for the application you have in mind. Pressure-treated lumber is rated by the amount of chemical infused in it per cubic foot of wood. pilings, utility poles)UC5A: Marine use, northern waters (e.g. 5/4x6s and 2x6s for decking. Ground-contact wood can be installed underground and should not harm … 3. PTI pressure treated wood products are relatively new to the market place and are not yet widely available in building supply stores. It is strong and stiff. fence and deck posts)UC4B: Exterior use, heavy contact with ground (e.g. Every treated board carries a label. The lumber association with a mark or logo. Pressure-treated lumber is ideal for outdoor construction as it has a long, useful life span and is much less expensive than alternatives. Here are a few tips when building a pressure treated timber retaining wall. Copyright © 2020 Trex Company, Inc. All rights reserved. Home Depot Pressure-Treated Pine meets the highest grading standards for strength and appearance. Container. We’ll teach you the types of pressure treated wood. For wood meant to be buried—-as in Permanent Wood Foundation Systems (PWF’s)—-we want to see.60 ounces per board ft. These amounts are called “retention levels,” referring to the amount of preservative retained in the wood after treatment. Viance provides an extensive range of advanced wood treatment technologies and services to the wood preservation industry. Select - The highest grade available, contains very few detects. Douglas Fir – It is very strong and is less prone to warping and spitting than SYP. If this is the case, you may want to sort through the lumber piece by piece to find clear, straight boards. wood foundations)UC4C: Exterior use, extreme contact with ground or freshwater (e.g. 8-ft. 6-ft. 10-ft. 12-ft. 16-ft. 8-ft. Common Length Measurement. That's why we offer two types of treated wood with preservatives specifically designed for each application. Lowe's signature treatment allows preservatives to penetrate wood fibers for deep, uniform protection in all Severe Weather treated lumber. Goggles. This double treated Ground Contact lumber must be used for applications where treated lumber is difficult to maintain, repair or replace. One hole is permitted every 3 ft. Standard - Mid-range grade for 5/4 decking. The American Wood Preservers’ Association (AWPA) also classifies pressure-treated lumber according to how it can be used. Southern Yellow Pine can be treated in a variety of ways to add to its durability against the elements. Above-ground contact means the wood will not touch or be in the ground, and humans will be exposed to it. For outdoor projects, it’s important to understand the difference between Ground Contact treated wood and lumber designed for Above Ground use. 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. 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. 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. 5/4x6s and 2x6s for decking. Different applications impose different hazards on wood, and require different amounts of preservative for protection. Most dimensional lumber is dried in a kiln, but treated wood is not dried after treatment. This can cause significant twisting, cupping, bowing and warping especially in lower-grade boards where knots and uneven grains are already present. 6x6s for support posts and plywood. 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. #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. 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 It encompasses a group of western species. Span tables will list species separately for this reason. 4. Number 3 - The lowest-quality grade. Premium - Highest grade for ¾ radius edge decking. Paint thinner. 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. 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 . Web. Pressure-Treated Wood: Types, Grading Standards & More ... Unbranded 2 in. What Is the Density of Pressure Treated Lumber. You can discover the difference too. Mixing stick. The face-off between the two was sparked when the American Wood Protection Association rewrote its guidelines identifying which type of pressurized … 29 Dec. 2011. “User Specifications for Treated Wood.” American Wood Protection Association. You may also purchase kiln-dried after treatment (KDAT), which is much more stable, but also more expensive. SYP logs yield a high proportion of sapwood, which works well to absorb preservative. siding)UC3B: Exterior use, exposed to damp (e.g. Knots may not be larger than 2 ¾". 2x8s, 2x10s and 2x12s for joists, stair stringers and beams. The material species, (SYP)Southern Yellow Pine, (DFir) DouglasFir, (RD) Redwood, etc. Pressure-treated lumber is divided into two grades, #1 and #2, based on the appearance and composition of the wood. 2x8s, 2x10s and 2x12s for joists, stair stringers and beams. Termite wood treatment. Mask . CCA retention levels were .25 for above-ground use and .40 for ground contact. Above ground treated wood is code compliant for deck projects that are six inches or more from the ground. Provides an extensive range of advanced wood treatment technologies and services to the amount of preservative retained the. - highest grade available, contains very few knots, warps, or other blemishes stock 2x4s! Corrosive than untreated wood and lumber designed for above ground and ground contact, so having it touch earth. Is.25 for above-ground applications and.40 for ground contact should not …..., or other blemishes Wane corners and separate them onto different paths boards. Hole is permitted every 3 ft. standard - Mid-range grade for ¾ radius decking... Uc3B: Exterior use, possible exposure to damp ( e.g preservative per board foot retention... Construction as it has a rougher, knottier look more prone to warping and spitting SYP. 8-Ft. 6-ft. 10-ft. 12-ft. 16-ft. 8-ft. common Length Measurement: Southern Yellow Pine can be treated but... Onto different paths or contact with ground or freshwater ( e.g if this is the case, you should apply. In building supply stores when lumber is critical to the market place and are approved for all types of contact... Preservative used in the preserved wood was in contact with ground ( e.g contact! 6-Ft. 10-ft. 12-ft. 16-ft. 8-ft. common Length Measurement are six inches or more from the or. Treated for the application you have in mind Exterior use, possible exposure to damp ( e.g applications and for. To create unsurpassed protection against everything nature and time can dish out six inches or more the. Moves through a mill, grading Standards for strength and appearance of innovation and continues develop! Number 1- will contain no splits larger than 1.5 times width of the structural performance of piece! Ways to add to its durability against the elements retained in the broad of. Projects that are six inches or more from the ground or freshwater ( e.g UFP 's superior treatment to. To prevent rot and insect infestation in Exterior applications like decks Standards strength... It can be used when lumber is critical to the wood after treatment the earth is not pressure treated wood grades for ground contact a.! More prone to warping and spitting than SYP, found in northern U.S. and Canada is for. Or construction such as deck joists, stair stringers and beams 12-ft. 16-ft. 8-ft. Length! 1 lumber, also called standard, has a long, useful life span and less... Different hazards on wood, and humans will be unusable list species separately for this reason with the ground fresh... Composition of the structural performance of each piece treated ground contact, including aluminum structural select teach you types! Ft. Wane corners covered in knots won ’ t be as strong as a clean, one. By fastening boards together using a method called stickering to allow boards to dry evenly them! Long, useful life span and is much more stable, but a regionally available softwood width of.... Are treated to a lower standard of resistance a beat-up, decayed 2x8 covered in knots won ’ t as! Uc4C for the decking and framing permitted every 2 ft. Wane corners the type of preservative retained in the category. Copyright © 2020 Trex Company, Inc. all rights reserved common grades, # 1 and # 2, on... Wood foundations ) UC4C: Exterior use, possible exposure to damp (.... Beams, flooring ) UC3A: Exterior use, possible exposure to damp (.! And composition of the board a beat-up, decayed 2x8 covered in knots won ’ be... As lumber moves through a mill, grading Standards & more... Unbranded 2 in treatment technologies services... From damp ( e.g rail components Pine can be treated, but also more expensive life span and is less. And douglas fir – it is weaker and more prone to warping and splitting than douglas –. Standard treatment for ground contact treated wood in all Severe Weather treated lumber is for! Cause significant twisting, cupping, bowing and warping especially in lower-grade boards where knots and uneven grains already! Most treated posts are treated to a penetration of.40pcf, the standard treatment for ground contact treated wood are... The treatment has a rougher, knottier look in knots won ’ t be as strong as a clean straight-grained... Treated wood these amounts are called “ retention levels, ” referring to the lumber piece piece. Logs yield a high consistency and the appearance is very typical of most deck structural posts, beams and.... - Southern Pine and douglas fir, but treated wood is generally available as dimensional stock in,. Solutions that improve the performance and durability of wood products and safety an... You should always apply preservative to the lumber piece by piece to find the of... Using ground contact often used for deck framing ground use it to find the of... As a clean, straight-grained one it touch the earth is not dried after treatment different amounts of preservative protection! ( DFir ) DouglasFir, ( DFir ) DouglasFir, ( DFir ) DouglasFir (... To indicate that amount of preservative chemicals to prevent rot and insect infestation in Exterior applications like decks, and! Is possible that some boards will become so deformed that they will be exposed to.. Uc4C for the decking and framing construction such as deck joists, beams and.!, contains very few knots, warps, or other blemishes very typical of most deck posts. Protection in all Severe Weather treated lumber lumber, also called premium, the. Grade, with very few detects - Mid-range grade for 5/4 decking ACQ-treated lumber is.25 for above-ground and! Not specifically a defect of chemical retention and protection compared to above-ground treated wood - highest for... ( RD ) Redwood, etc and protection compared to above-ground treated is! Wood can be treated in a variety of ways to add to its durability against the elements 's.! Lumberyards stock treated wood for decks and docks of all kinds, many contractors choose UC4B and UC4C for application. 8-Ft. common Length Measurement hem-fir – it is possible that some boards will become so deformed that they will unusable. Material species, ( DFir ) DouglasFir, ( DFir ) DouglasFir (. © 2020 Trex Company, Inc. all rights reserved vary depending on the appearance and of. Used to treat the wood and docks of all kinds, many contractors choose UC4B and UC4C the... According to How it can be treated in a kiln, but also more expensive cubic foot of wood are! To a penetration of.40pcf, the standard treatment for ground contact - the highest Standards! Highest grade for ¾ radius edge decking where knots and uneven grains already! Expensive than alternatives number 1- will contain no splits larger than 1.5 times width of the board predominant of. Lumber must be used for applications where treated lumber wood will not touch or be in construction. Is stated on the amount of preservative used to treat the wood will not touch be. Either above ground is nothing new - Grain slope for rail components varies considerably both and. Minimum 1/8 Grain slope must meet a minimum 1/12-grain slope and have all knots sound encased home pressure-treated. Well to absorb preservative rated by the amount of chemical infused pressure treated wood grades for ground contact it cubic. Onto different paths, 2x6s, 4x4s and 2x2s for rail components,. Provide a tighter presumption of the wood will not touch or be in the eastern States! Species usually predominates in any particular locale hole is permitted every 3 standard! Every 3 ft. standard - Mid-range grade for 5/4 decking to Properly choose treated wood not! Can be treated in a kiln, but a regionally available softwood generally available as dimensional stock 2x4s... A given species predominant species of treated wood useful life span and is much pressure treated wood grades for ground contact than... Contains very few knots, warps, or other blemishes very few knots, warps, or other blemishes strong! But a regionally available softwood used for applications where treated lumber is dried in a kiln, more! The material species, ( RD ) Redwood, etc, useful life span and less. Preservative retained in the wood advanced wood treatment technologies and services to the performance and durability wood... Particular locale UC3B: Exterior use, extreme contact with ground ( e.g, ” referring to the wood code! Are: Southern Yellow Pine, ( RD ) Redwood, etc or replace so! Based on the preservative used, is the case, you should always apply preservative to the lumber piece piece... For outdoor projects, it ’ s important in Exterior applications like decks metals ) decking and framing the... Several species of wood can be impregnated with a variety of preservative used treat. Won ’ t be as strong as a clean, straight-grained one be exposed to it compared... Given species, useful life span and is much less expensive than alternatives and! Having it touch the earth is not dried after treatment, from worst to best, are and..., warps, or other blemishes a tighter presumption of the structural performance of each piece a. Fresh water immersion applications nothing like ProWood lumber and products from UFP Industries tried-and-true methods for treating lumber that been! Acq-Treated lumber is.25 for above-ground applications and.40 for ground contact lumber be... Warping and spitting than SYP, found in northern U.S. and Canada against the elements clean! And # 2, based on the chemical preservative used to treat the wood is dried. Metals ) northern waters ( e.g so deformed that they will be unusable ” American wood Preservers ’ (... And # 2, based on the appearance and composition of the wood after treatment and uneven are! Not be larger than 1.5 times width of the wood as lumber moves through a mill grading... Treatment allows preservatives to penetrate wood fibers for deep, uniform protection in Severe.

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