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The pressure-treatment process Timber components, machined to their finished dimensions and at an appropriate moisture content, are impregnated with preservatives in large pressure vessels, where the combination of vacuum and high-pressure drives the preservative into the wood. A study by the EPA in 2000 deemed it too hazardous for residential use, and in 2003 the lumber industry agreed to stop using it for residential purposes. Selecting the correct type of treated wood for a project often depends on how and where it will be used. The plant is required to keep very specific information for each charge treated in its records system. A high-pressure period is then undergone to push the preservative deep into the wood. D Fir-L or Doug Fir for Douglas fir or larch (L), H-F, Hem-fir, or Hem for hemlock-fir or hemlock. Recommended where a combination of economical construction and good strength is desired. Once on the drip pad, the material will stay until it is dry enough to be moved into the plants treated inventory. The amount of chemical retained determines how resistant the lumber will be. Review this helpful illustration showing the proper application of pressure-treated Southern Pine materials for a variety of projects around the home. Decking materials such as 26 and 5/46 frequently are of better-looking #1 and #2 lumber. Overly dry wood often needs a pilot hole before fastening to prevent splitting. This Old House general contractor Tom Silva usually buys stacks of No. MSR Scaffold Plank is available 2"-thick only. It is a very strong and stiff softwood, and dense too. (Kiln Dried After Treatment). OK then thanks. (See Wood Code, below). The treating process includes an initial vacuum to remove the excess moisture and air to aid in the absorption process. Treated wood products must meet very specific quality requirements to meet the building code. It's usually stapled to the wood and isn't a requirement to be on the actual stamp. Pressure treated lumber is available in 1, 5/4, 2, 4, and 6 nominal thicknesses, and widths up to 12. For demanding applications, such as interior load-bearing walls, hell pay extra for these stronger grades. Records, trained personnel and an approved, properly equipped laboratory (either in-house or an approved external lab) are also required to complement the penetration and retention sampling requirements. Box 10915 Pensacola, Fl. Some types of timber have natural abilities while others need a boost. SPIB is committed to assisting our customers meet their treatment goals in the most cost-effective means possible. Ultimately, our program provides an economically sound and standardized method of treatment, evaluation, labeling and certification for producers, specifiers and end users of pressure treated wood products. The best pressure treated wood for decks is Select, #1 or #2 grade wood. Outside building projects and even some damp areas inside require wood that is resistant to moisture damage. An excellent decking grade that can be used face side down for roof decking or face side up for floor decking. Grade Descriptions - Southern Pine Pressure treated wood can also be stained or sealed to enhance its color and for added protection. Re-inspection of plant production is performed on a routine frequency by the agency. The main tree species used in the manufacture of pressure treated lumber are softwoods that regionally predominate in the mill area. No.2 Prime SPIB is subject to continual review by IAS to ensure that the laboratory and agency records remain in compliance. Powered by Discourse, best viewed with JavaScript enabled, www.strongtie.com/products/ptwoodfaqs.html, http://www.anthonyforest.com/pdfs/AWPA-Use-Category-System-U1-07.pdf. Quality control for treating should be done by an approved inspection agency. Wood treated with water-based preservatives for saltwater immersion has significantly higher retention levels than other types and categories. 2023 Southern Pine Inspection Bureau | All Rights Reserved | SitemapP.O. Species and Sizes Of Pressure Treated Wood, Different Kinds of Softwoods That Are Pressure Treated, Tips for Working with Pressure Treated Wood, Types of Pressure Treated Lumber and Where to Use Them, Sill & bottom plates, damp locations, basement framing, bathrooms, flooring, baseboards, Exterior Above Ground, Coated with Rapid Runoff, Exterior Above Ground, Uncoated or Poor Runoff, Cedar shakes, exterior stairs, joists, beams, decking, railings and fence boards/pickets, any wood within 6 of soil & vegetation, Fence, deck & structural posts, ledgers, retaining walls, garden boxes, any wood within 6 of soil, vegetation, or freshwater, or poor air circulation, As with UC4A plus posts set into the ground, retaining walls, wood foundations & supports, freshwater contact, saltwater spray, garden & utility posts, Pilings or wood in direct installation in soil, gravel, concrete, freshwater, or extreme weather exposure, Contact & immersion in cold ocean waters north of Long Island & San Francisco, docks, piers, wharves, shore walls, boardwalks, & buildings, Contact & immersion in warmer ocean waters south of San Francisco and Long Island, and similar to UC5A, Contact & immersion in warm Gulf Coast waters & south of Georgia, and similar to UC5A, Interior construction, no ground or moisture contact, fire partition walls, kitchens, hallway & stairwell framing, Exterior construction, exposure to weather but not ground contact, porches, exterior stairs, window treatments, Tight and well-spaced, and no larger than 2-3/4 on a 28, Well-spaced and no larger than 3-1/2 on a 28, 1/4 the thickness and 1/4 the width full length, or not greater than 1/2 the thickness or 1/3 the width for 1/4 of the length, 1/3 the thickness and 1/3 the width full length, or not greater than 2/3 the thickness or 1/2 the width for 1/4 of the length, Checks separation across or through growth rings due to seasoning, Unlimited surface seasoning checks with through checks limited to splits, Skips surfaces that were missed or failed to clean, Maximum of 5% of the plank or 2 or less in length, Shake lengthwise separation through or between growth rings, Limited as splits if through or 2 long on the surface only, Limited as splits at ends if through or 2 long if well separated, or maximum of 3 or 1/4 the length if surface only, Warp bow, crook, cup, twist, or any combination, Sapwood stained or firm heart or red heart stain, No limit to sapwood stained or firm heart stain or red heart. The tag identifies its proper use Above Ground, Ground Contact, etc. No. Superior product suitable for a wide range of uses including shelving, boxing, crating, and form lumber. WestWood Heat Treated Lumber Production Corporation is unique technology that uses heat treatment instead of chemicals for timber processing to significantly improve various characteristics of wood. It should be noted, #2 & BTR does not mean #1. Recommended for general framing purposes. Recommended for construction where high strength, stiffness and good appearance are desired. Knots must be well spaced and tight, so they wont fall out, and no larger than 2-3/4 in a 28. Luckily, a more budget-friendly option of pressure treated lumber grades is available. Email: [email protected]. #1 will have less knots and is typically spec'd for joists and rafters. 6^,fniSgdc24.L7` b. Identifies the accredited agency or association that oversees grading accuracy, in this case the National Lumber Grades Authority. it is damn difficult to tell the differance on the new stuff. The molecular changes in wood composition result in unique features: Those and other treatments are used for industrial purposes instead. Basements and bathrooms are other areas where pressure treated wood can be used to frame interior walls to protect against moisture, mildew, and mold damage. Larger sizes conform to Dense Structural 65 Structural Lumber except for dense grain requirement. The Fora platform includes forum software by XenForo. THE TREATING PROCESS, QUALITY AND IQC RESPONSIBILITIES. Green Building Material . See Table 2 or SPIB Grading Rules for design values. Behind the Mark: A Look at the SPIB Treated Wood Inspection Process Its appearance ranking requires it to be 75% free of knots or defects. "Stud" is a fifth designation, meaning it's good for a load-bearing wall. This grade is available in dimensions of 24, 26, 28, 210, and 212 and in lengths from 8 through 24. 3 (lowest strength, not pretty). The lumber has the structural strength it is graded with but has fewer blemishes or knots, so a better appearance. s The wood is 43% clear for appearance grading. It's easy to work with. For complete information about types of preservatives, the latest industry standards, product identification and specification guidelines, refer to SFPAs booklet,Pressure-Treated Southern Pine (download in Publications). The preservatives provide protection against rot, insects, mold, and fungi, so the wood lasts longer. Tell us how we're doing! The look of the wood is only important if it is highly visible, such as deck boards, railings, and other visible structural members. Suitable for economical use as sheathing or lathing. I grabbed an exerpt here and there and put it all together, for I was on a lot of different sites and suppliers. The ALSC also accredits third-party agencies, like SPIB, to inspect treating plants that produce treated lumber products with preservative systems listed in the American Wood Protection Association (AWPA) Book of Standards (BOS). http://www.anthonyforest.com/pdfs/AWPA-Use-Category-System-U1-07.pdf. Establishes lumber quality based on a graders visual inspection. SPIB also inspects mills that manufacture and label various lumber products under these rules. This website is presented by SFPA members, including: 2023 Southern Forest Products Association. WestWood Heat Treated Lumber Production Corporation vapor-stabilization technology is a patented wood heat treatment technology, utilizing a natural thermochemical reaction and steam at temperatures of 230-240 C (450 F) and exclusive of any chemical additives. Recommended where appearance and strength are a consideration. 2 x 4 x 20' Prime Pressure Treated #2 Lumber *BUY IN BULK* AND SAVE As we can find no formal and simple description of all the different grades, we attempt to describe the grades that we currently stock so that you can decide what best fits your need and customer base. 32524-0915 Well-manufactured material evaluated by calibrated mechanical grading equipment which measures certain properties and sorts the lumber into various strength classifications. Many DIYers and even some professionals arent familiar with the different types of pressure treated wood and their uses, or that the information is on the end-tag stapled to the board. Pressure treated lumber has been infused with preservatives to prevent rot and insect damage. Spi-1 and Spi-B control the expression of the Grap2 gene in B cells Georgia-Pacific pressure treated lumber is an economical building material that offers all the benefits of wood, plus built-in resistance to decay and termite damage. Recommended for general construction purposes where appearance is not a controlling factor. Recommended for most general construction uses where moderately high design values are required. maple, oak, birch, etc. Trex gets awfully hot also and demands upkeep. You Save $3.39 with Mail-In Rebate. *Load duration factors greater than 1.6 shall not apply to structural members pressure-treated with water-borne . Tough to find decent boards. The cores are then dried and ground for the purpose of analyzing the dust by x-ray, titration or gas chromatography methods. The solution protects against insects, mold, mildew, fungus, and rot, and turns the wood a light brown hue. Georgia-Pacific Corporation Pressure Treated Lumber - GlobalSpec The grade mark can include "1W" or "2W" if visually graded to the wane requirements for No.1 or No.2 dimension lumber, respectively. Penetration is verified on-site by the third-party inspector before sending the assay zones to the agency laboratory for retention analysis. It's distinctive wood grain appearance is great for decorative finishing. Unfortunately, the water-soluble nature makes them susceptible to leaching out in rainy or wet areas, or near standing water. However, some KD-HT wood at your local lumber yard might have a tag on the end of the lumber that specifies PT. As a result, we have more grades available to our customers now than at any other time in the history of our company. Ground contact level treatment (.15 pcf) has more than double the preservative of above ground level treated wood (.07 pcf) Lighter, more natural wood appearance for improved staining qualities. It has nothing to do with the wood being pressure treated (PT) at all. r The greater the content of preservatives denotes the type and use of the treated wood. The lumber is stronger than #1 or #2 and is ideal for all structural construction applications. check out this FAQ web site. However, the tight grain also makes it less receptive to pressure treatment. It can be used to span greater distances, an SPF SS 28 will reach 15-3. The retention level is measured in pounds of chemical per cubic foot of wood (pcf). Just to second what rjniles just said, the HD guy couldn't be more wrong (imagine that). But not all defects are obvious. endstream endobj 146 0 obj <>/Filter/FlateDecode/Height 49/Intent/RelativeColorimetric/Length 6519/Metadata 150 0 R/Name/X/Subtype/Image/Type/XObject/Width 174>>stream Provides good appearance with some of, Maximum recommended support spacing is 24" on center (16" on center for Imported Southern Pine), High-quality product, recommended where smallest knots are, Slightly less restrictive than premium grade. hVmO9 ^TUJk[ Admits pieces below a No.3 grade which can be used without waste, or which contain less than 25% waste by cutting.