It has a grain slope of 1 in 12, may have seasoning checks, and tight, well-spaced knots up to 2-1/4 on a 28. There are many questions about the different treated wood products in our market today. She said that some of the new PT looks so much like untreated they have to add a color enhancer to it. It's usually stapled to the wood and isn't a requirement to be on the actual stamp. 139 0 obj <> endobj 153 0 obj <>/Filter/FlateDecode/ID[]/Index[139 24]/Info 138 0 R/Length 80/Prev 801267/Root 140 0 R/Size 163/Type/XRef/W[1 2 1]>>stream #1 #2 prime etc deals with the quality of the board. 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. The result of having a unified rating means the end-tag on lumber identifies how well the wood will stand up in different conditions, regardless of the chemical cocktail its been exposed to. High utility value where appearance is. Recommended for general construction uses. This service is intended to assist mills in supplying products that meet the standards for wood packaging Behind the Mark: A Look at the SPIB Treated Wood Inspection Process Appearance is same as C Finish for thicknesses of 4" and less and widths 12" and less. The stamp identifies the wood species, grade, moisture content, inspection organization, and the mill it came from. Both can be used for load-bearing purposes or other outdoor applications. it's primarily 2x planks. Tyrosine phosphorylation and calcium mobilization induced by BCR engagement is diminished in Spi1+/- SpiB-/- B lymphocytes, although many key BCR signaling proteins are expressed, suggesting that Spi-1 and Spi-B regulate expression of additional . All lumber must identify the association or agency accredited with overseeing the grading MLB is the Maritime Lumber Bureau. r The preservatives provide protection against rot, insects, mold, and fungi, so the wood lasts longer. Recommended for construction where high strength, stiffness and good appearance are desired. The preservatives dont affect the load-bearing abilities, just provide protection against insect, mold, mildew, and rot damage. Most of this new treated lumber looks untreated as compared to the old green stuff, I did learn that they add color to some of it to try and make it look more like treated. Raised floor homes look great and protect homeowners against risks from flooding and subsiding soils. How to Figure Out if Wood Has Been Pressure-Treated, and Why It Matters Re-inspection of plant production is performed on a routine frequency by the agency. The current process is mostly computerized and mechanized using modern technology. Review this helpful illustration showing the proper application of pressure-treated Southern Pine materials for a variety of projects around the home. The main difference between #1 and #2 is the slope of the wood grain, size, spacing, and the number of knots and holes, and the length of any splits. MSR Scaffold Plank is available 2"-thick only. Number 2 grade lumber often has more knots and blemishes than #1 grade but may be clear enough on one face to be deemed select or premium. Use UC3A pressure treated lumber for above ground exterior projects. The very basic quality control attributes to evaluate the level of treatment in lumber products is the determination of the depth of preservative penetration and the analysis of preservative retention in a specified, outer assay zone. 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. 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. Our next Blog will take the samples to the SPIB laboratory for analysis to determine if retention values are conforming. Both DIYers and building professionals will like these garden and outdoor living ideas and plans. Pressure treatment is an affordable alternative to expensive naturally rot-resistant lumber. Both #2 grades have all the characteristics, including knot size, of regular #2 grades but are selected for 4 square edges (very light to no-wane or bark). In ancient times the Greeks used olive oil, the Romans tar, and others used pitch or lye. The solution protects the wood from rot, insects, fungus, mold, and mildew, and also turns the wood a brown tone. Premium is often identified as A, B, C, and D. A has no visible defects, knots, or splits, B has a few small defects visible, C may have small knots on one side and none on the other, and D may have pin size (up to 1/2) knots or small defects on both sides. www.strongtie.com/products/ptwoodfaqs.html, FAQ: Pressure-Treated Wood | Simpson Strong-Tie. KD HT lumber vs PT lumber for deck - InterNACHI Forum No.2 Prime Luckily, a more budget-friendly option of pressure treated lumber grades is available. Non-stress rated, but economical for general utility purposes such as bracing, blocking, bulkheading, etc. Follow along as we decode the stamp and show you how to get the most lumber for your money. outdoor deck question. heat treated vs pressure treated wood The kd19 is the customers assurance that it was dried to the proper level before it left the plant. Before a given charge can actually go into the plants treated inventory to be ready for shipment, it must first be evaluated for penetration. 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. However, the tight grain also makes it less receptive to pressure treatment. These factors, plus the moisture content at the time of milling, determine the grade assigned. Check sources of supply for available grades and sizes. Most lumber in my area is listed as Prime or Premium depending on the box store and is stamped #2 or #2 & BTR. @_10ip CzHrGfnl~Frc>fkH 2X [ ^ endstream endobj 140 0 obj <>>> endobj 141 0 obj <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageC]/XObject<>>>/Rotate 0/TrimBox[0.0 0.0 595.276 841.89]/Type/Page>> endobj 142 0 obj <>stream Its appearance ranking requires it to be 75% free of knots or defects. The grade of lumber is noted SS, #1, #2, #3, or STUD and the price reflects the quality. (KD-HT means the wood was also heat treated to kill pests, a requirement for imported lumber.) The International Code Council Evaluation Service (ICC-ES) similarly approves preservative systems through its Evaluation Service Reports (ESRs). Pressure treated wood used for in-ground or critical use has a greater retention level than timber used for above or ground contact. The lumber has the structural strength it is graded with but has fewer blemishes or knots, so a better appearance. The table below identifies the main differences. UC3B or UC4A are best for ground contact use. No 4x or 6x stuff that you might use for skids. 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. H\Ak0:b @HZ=8&5FqjfvRut.I/55zb6+]5m&.wgUWm,ZM]nrO=gu${Tu?co2:4 It has a unique broad grain cellular structure that allows for uniform and deep penetration of chemical preservatives. This defect is exacerbated in the presence of Spi-1 haplo-insufficiency (Spi1+/- SpiB-/-). The process is similar for treating milled lumber, plywood, posts, or utility poles against rot and insects. They dont discolor the wood and protect against insects, molds, mildew, and fungi. '\ & Ls30+X61j\e(gV]]M(q9qs)loyM The grade mark can include "1W" or "2W" if visually graded to the wane requirements for No.1 or No.2 dimension lumber, respectively. The best pressure treated wood for decks is Select, #1 or #2 grade wood. materials that may be exported. Premium is usually #1 or #2 grade lumber. May have to look at Home Depot closer, since they carry #1 above ground. Recommended for uses where high strength, stiffness and good appearance are desired. Select grade lumber may have a knothole every 4 and splits can not be longer than the board is wide. Grademarks. However, treated lumber may be kiln-dried or wet and will shrink, cup, and warp as it dries. It appears as a new technology from Canada. Wood packaging material made of unprocessed raw wood is recognized as a pathway for the introduction and spread of pests. We think it is only appropriate to attempt to describe these grades for your reference to help you better understand what you currently stock and what is additionally available to you and your customers. r Once penetration is verified, the outer section of the cores is removed to measure the amount of preservative retained. Pressure-treated wood can dry in about 1 month, whereas fresh wood provides an environment where fungi and bacteria produce rot and insects infest. It is stronger than #2 or #3 grade lumber. Pressure treated lumber has been infused with preservatives to prevent rot and insect damage. The quest for decent boards begins. In this article, well explain pressure treated (pt) lumber, the different types and uses, and how it is graded. The SPIB Treated Wood Quality Audit Program provides a customized third-party quality control program to help Treated Wood producers meet industry-approved standards. 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 SPIB is committed to assisting our customers meet their treatment goals in the most cost-effective means possible. There are different types of treatment and lumber grades for different uses. HWW&)@@vaU\P}qtyneG@@x7]Ia8QNoW%T"HH zB-rJ(TG?e)-3"kzvdkMwTXcfb`UML||d]/t@Q1~Q#|30LQA RG vy_rfazhfx NL+XEB7Hb%Y5?_9_h4}EZ^R Z}'a1+&z&j+m}b? z[TWL*baKq @NO{CHpXa2 PkHX%W!AH0aP1 bB z%Oev+Yh!UL$(MJ \N See Finish grades for face side; reverse side wane limitations are lower. Twenty cores are taken randomly throughout the charge to measure the depth of preservative penetration in each core. Here are the grades and types of lumber most commonly available, plus the percentage of clear wood you could expect for the appearance market or grade: Lumber with few or no knots or blemishes may be called premium by some mills or retailers to capitalize on DIYers wish for better-looking lumber. A quick depressurization cycle then removes any excess from the wood before it is removed from the treatment cylinder. My electrical answers are based on 2017 NEC, you may have local amendments. Suitable for use as individual laminations for structural glued laminated timbers. Pressure treatment doesnt make the wood stronger or weaker, just more resistant to insect and moisture damage. This specific set of data for each charge is called a charge report. 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). Got your hard hat and high-vis vest? Office: (850) 434-2611 | Toll Free: (800) 995-7742 MSR lumber is distinguished from visually stress graded lumber in that each piece is non-destructively tested. The ranking goes from Select Structural (highest strength, best appearance) to No. ), how wood is used also comes down to whether or not it's pressure treated. How to Read the Stamp - This Old House Some lumber is also treated for fire protection and used throughout different areas of residential, commercial, and industrial construction.