Other than the features that depend on the type of tree the wood came from (i.e. o>>QS-RSnwO4piq4Szh+jkS3NQn(:;^unn^}Q8ws{7sFS However, some KD-HT wood at your local lumber yard might have a tag on the end of the lumber that specifies PT. You Save $3.39 with Mail-In Rebate. Here is another good link a guy posted over on Ins News Fax: (850) 434-1290. The vacuumed cells more readily absorb the solution for better penetration. Establishes lumber quality based on a graders visual inspection. #1 grade can have more wane (or bark) Southern yellow pine in the eastern U.S., spruce pine and fir in the northern U.S. and eastern-central Canada, and Douglas fir, fir, and hemlock in the western U.S. and Canada. (KD-HT means the wood was also heat treated to kill pests, a requirement for imported lumber.) Industry quality-control standards for the manufacture and preservation of Southern Pine ensure long-term performance and minimize environmental impact. Allows well-spaced knots of any quality. Both DIYers and building professionals will like these garden and outdoor living ideas and plans. Structurally, an SPF #2 28 can be used to span distances of 14-11. Overall plant evaluation is done by means of separating and inspecting all of the different Production Categories to help identify very specific areas of concern, if any exist. Pressure treatment doesnt make the wood stronger or weaker, just more resistant to insect and moisture damage. In ancient times the Greeks used olive oil, the Romans tar, and others used pitch or lye. D Fir-L or Doug Fir for Douglas fir or larch (L), H-F, Hem-fir, or Hem for hemlock-fir or hemlock. 2 kd 19 ht 434 and spib ht 434 it looks like it's kiln dried and heat treated, but is it pressure treated to resist rot? Characteristics are limited to provide good strength and excellent serviceability. Pressure treated lumber comes in a variety of lengths, widths, and thicknesses and from different species of softwood. 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. The certification identifies the grade rules used to grade the lumber for example, ALSC is the American Lumber Standard Committee and NLGA is the National Lumber Grades Authority. SPIB is accredited through IAS and maintains ISO certification as both an inspection agency (ISO 17020) and a Laboratory (ISO 17025). maple, oak, birch, etc. I grabbed an exerpt here and there and put it all together, for I was on a lot of different sites and suppliers. &_ePM&dWCh Use in-ground type lumber where there is a greater risk of deterioration or severe environmental exposure, or for critical structural components like foundation posts, exposure to fresh or groundwater, or utility poles. Non-stress rated, but economical for general utility purposes such as bracing, blocking, bulkheading, etc. r Lumber that is imported or for export requires the designation KD-HT, which means it has been kiln-dried and heat-treated to kill insects. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. The greater the content of preservatives denotes the type and use of the treated wood. But using bigger joists of a cheaper species might save you money without loss of strength. CCA Pressure-Treated Wood Wood-constructed homes, roof shakes and shingles, exterior decks, and children's play equipment that were built before 2004 and not made of cedar or redwood were likely constructed using wood that was pressure-treated with CCA, or chromated copper arsenate. The preservatives dont affect the load-bearing abilities, just provide protection against insect, mold, mildew, and rot damage. It is used for all areas of residential construction from load bearing to trim. Water-repelling at a molecular level Each charge sheet is reviewed to verify that all IQC requirements have been met and properly documented. Description & Documents #2 prime southern yellow pine with virtually no wane CA-C Above Ground pressure treated exterior wood protected by Ecolife (EL2); a stabilizing formula that repels water keeps boards straighter and looking better longer Ecolife (EL2) provides built-in water repellency that lasts for up to 3 Protecting wood against rot and insects has been done for centuries. The two remaining designations, while not very useful to a homeowner, enable grading agencies to enforce their standards. UC3B or UC4A are best for ground contact use. ACQ is another environmentally safe preservative composed of soluble copper and either quaternary ammonium alkyl or substitute compounds. Not all PT is rated for ground contact. To qualify for a SPIB grade-marking license, a mill must have verified credentials in the manufacturing, seasoning, and grading of Southern Pine lumber. s In preparation for treatment, like lumber products are grouped together onto moving trams and placed into a large cylinder for treatment of the charge. High utility value where appearance is. CCA is comprised of arsenic, chromium and copper. A number that identifies the mill where the lumber was produced. #2 Prime grade has the strength of #2 grade lumber, but will look better, with fewer knots Premium Grade: Use when small knots are desired and appearance is very important. 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. Generally clear, although a. It is stamped S-GRN for surface-green or AD for air-dried. Copyright 2023 This Old House Ventures, LLC. The table below identifies the types and their use based on the level of retention of preservatives. Knots must be well spaced and tight, so they wont fall out, and no larger than 2-3/4 in a 28. Suitable for use as individual laminations for structural glued laminated timbers. The molecular changes in wood composition have a result of dimensional stabilization, protection against rot and wither, and as a result, expanded use opportunities. More knots than Premium grade it also has several good links. It must specifically be labeled ground contact. IQC results of treatment for each charge are required to be documented in the plant records to correspond to the individual charge reports. Tel: 843-236-9399. These factors, plus the moisture content at the time of milling, determine the grade assigned. In this article, well explain pressure treated (pt) lumber, the different types and uses, and how it is graded. I don't think HD carries it. Follow along as we decode the stamp and show you how to get the most lumber for your money. Box 10915 Pensacola, Fl. Use tar paper or bituminous tape to protect metal brackets and ho-dipped galvanized or stainless-steel fasteners, or those specially coated to prevent corrosion by wood preservative chemicals. Southern Pine's ease of treatability has made it the preferred species when pressure treatment with wood preservatives is required. Its appearance ranking is 80% or better clear of defects. Quality control for treating should be done by an approved inspection agency. MSR lumber is also required to meet certain visual grading requirements. Typically, the first step of a third-party agency audit involves a review of the plants records. While all species are graded at the same four levels of strength and appearance, they are not equally strong. Lumber structurally graded #1 or #1 & BTR (#1 and better) has a wood grain slope of 1 in 10. Pressure treated wood has many outdoor uses and even is used in some indoor locations, especially where moisture may be a concern. %PDF-1.5 % endstream endobj 145 0 obj <>stream The species and grade, however, affect the spacing between supports with #1 often rated for greater spans. The American Wood Protection Association (AWPA) sets the standards for the retention level required for the different chemical preservative compositions for specific types of use. Today, pressure treated lumber for residential use is commonly pine, spruce, or fir that has been immersed in a water-based chemical bath of preservatives. 6^,fniSgdc24.L7` b. Sep 13, 2020 i would not use that for cutting boards,looks to be a soft wood and you want a hardwood like maple or cherry. Pressure treated lumber is divided into different types based on the retention level or amount of preservative retained in the wood after treatment. Douglas fir has a tight close grain cell structure making it stronger and less prone to warping and twisting than pine. The preservatives provide protection against rot, insects, mold, and fungi, so the wood lasts longer. All rights reserved. Got your hard hat and high-vis vest? Those stacks also include some No. The table below identifies the main differences. Application of the product requires pressure treatment by an approved treating process and preservative for. For additional information on the proper handling and storage of pressure-treated Southern Pine materials,click here. Final Price $ 27 40. each. Treated wood products must meet very specific quality requirements to meet the building code. No 4x or 6x stuff that you might use for skids. Machine Stress Rated (MSR) lumber is evaluated by mechanical stress rating equipment. "Stud" is a fifth designation, meaning it's good for a load-bearing wall. r Recommended where a combination of economical construction and good strength is desired. The type identifies the amount of chemical retention which in turn determines how or where to best use the lumber. 32524-0915 Most likely it is a treated board, since most treated lumber is sold wet, some yards sell K.D.A.T. It could be HT and then PTd later? Prime Dimension: 2" to 4" thick, 2" to 12" wide; See Table 1 for design values: Grade: Grade Characteristics and Typical Uses: No.1 Prime: Recommended where appearance and strength are a consideration. This Old House general contractor Tom Silva usually buys stacks of No. Mobile, AL. It appears as a new technology from Canada. Recommended where appearance and strength are a consideration. Research shows that . The lumber has the structural strength it is graded with but has fewer blemishes or knots, so a better appearance. Pressure treatment is an affordable alternative to expensive naturally rot-resistant lumber. %\dbZ!1T09 F.#3s3+VdIr9f>LQOL7-1K)s+}OY'\awt_D FfhWnK8R5 @^L;@e\;7&8/O_PL;V@SqqZEy?9S=Z_{uh@fx:DSs=8! b+! For demanding applications, such as interior load-bearing walls, hell pay extra for these stronger grades. A forum community dedicated to Do it yourself-ers and home improvement enthusiasts. Selecting the correct type of treated wood for a project often depends on how and where it will be used. It's distinctive wood grain appearance is great for decorative finishing. hbbd``b`i@i`}{" s@BHpE ^ !RHp@00 30 . endstream endobj startxref 0 %%EOF 162 0 obj <>stream This process is required through the plants Internal Quality Control (IQC) for all treated lumber products to be represented as meeting an applicable standard. ehV$W'A Email: cspsales@canfor.com. Dont know how PT Pine looks. Dont know anything about the HT lumber, but if you are in the west, the PT is still Western Hemlock and looks pretty much the same as before. Pressure treated wood may require several weeks or even months to dry before it will absorb stain or paint. One wide face and both adjacent narrow faces must be free of pith and/or heartwood. (Kiln Dried After Treatment). For a better experience, please enable JavaScript in your browser before proceeding. This information must include the charge number, treatment date, products treated, tally, cycle parameters and preservative solution strength for each charge. {Vzgil=ecQ*Q\o[lb[9X^gZyzzxzxxxyO`}@}(% m6@93 gx$?yV7`{x"?W@_} s '\ & Ls30+X61j\e(gV]]M(q9qs)loyM Penetration is verified on-site by the third-party inspector before sending the assay zones to the agency laboratory for retention analysis. It is used to build exterior stairs, for posts, sheathing, siding, porches, decking, and railings too. It is the material of choice with both professionals and do-it-yourselfers for projects exposed to the rigors of weather, hot, humid climates, decay, and termites. *Load duration factors greater than 1.6 shall not apply to structural members pressure-treated with water-borne . Treated wood is made from strong evergreen species making it suitable for most building projects. MC-15 identifies lumber as having 15% or less moisture content. The wood grain has a 1 in 8 slope, and there may be bark edge or wane visible. Each American Lumber Standard Committee (ALSC) certified agency has its own registered grade-mark. Standards Revised The 2016 Book of Standards published by the American Wood Protection Association(AWPA) includes revisions to treated wood standards: Ground Contact-treated wood is now required when installed less than 6 off the ground; when it is wetted on a frequent and recurring basis; for joists and beams that are difficult to maintain, repair or replace and are critical to the performance and safety of the structure; when used in tropical climates. 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. The quest for decent boards begins. The amount of moisture in the wood at the time of milling is noted. #2 Prime grade southern yellow pine. The scope of the ALSC review may also include physical inspection of treated wood products at the plant location to verify penetration and retention as a means of comparing against previous findings by the agency. By the end of the article, youll have a better understanding of what different pressure treatments mean, and how to select the grade and type for the use you intend. Suitable for stud uses including use in load-bearing walls. The chamber is then flooded with a diluted chemical solution, and hydraulic pressure applied for 20 to 60 minutes to force the solution deeper into the wood. SPIB also inspects mills that manufacture and label various lumber products under these rules.
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