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ESR-1387 Reissued February 2021 Revised April 2021 This Report Is Subject to Renewal February 2023

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ESR-1387 Reissued February 2021 Revised April 2021 This Report Is Subject to Renewal February 2023 ICC-ES Evaluation Report ESR-1387 Reissued February 2021 Revised April 2021 This report is subject to renewal February 2023. ® www.icc-es.org | (800) 423-6587 | (562) 699-0543 A Subsidiary of the International Code Council DIVISION: 06 00 00—WOOD, PLASTICS AND 3.0 DESCRIPTION COMPOSITES Section: 06 17 13—Laminated Veneer Lumber 3.1 General: Section: 06 17 23—Parallel Strand Lumber The structural composite lumber and oriented strand board Section: 06 17 25—Laminated Strand Lumber products described in this report comply with ASTM D5456 (PS 2, AC124 and ASTM D7672, where applicable), and are REPORT HOLDER: described in Sections 3.2, 3.3, 3.4 and 3.5. WEYERHAEUSER 3.2 Microllam LVL: ADDITIONAL LISTEES: Microllam laminated veneer lumber (LVL) is manufactured from wood veneers laminated together using an REDBUILT™ LLC exterior-type structural adhesive. All veneers are oriented with the wood grain parallel to the length of the member. The EVALUATION SUBJECT: wood species, properties, adhesives, manufacturing parameters and finished product tolerances are as specified STRUCTURAL COMPOSITE LUMBER AND ORIENTED in the approved quality documentation and manufacturing STRAND BOARD: TIMBERSTRAND® LAMINATED standard. Microllam LVL is available in various grades and STRAND LUMBER (LSL); PARALLAM® PARALLEL thicknesses as indicated in Table 1, with depths ranging STRAND LUMBER (PSL); MICROLLAM® LAMINATED from 2.50 inches (63.5 mm) to 48 inches (1219 mm), and VENEER LUMBER (LVL); TIMBERSTRAND® LSL RIM lengths up to 80 feet (24 380 mm). ® BOARD; REDBUILT LSL RIM BOARD; TJ RIM BOARD; 3.3 Parallam PSL: AND WEYERHAEUSER RIM BOARD Parallam parallel strand lumber (PSL) is manufactured from 1.0 EVALUATION SCOPE wood strands that are oriented parallel to the length of the member and bonded together using an exterior-type Compliance with the following codes: structural adhesive. The wood species, properties, 2018, 2015 and 2012 International Building Code® (IBC) adhesives, manufacturing parameters and finished product tolerances are as specified in the approved quality ® 2018, 2015 and 2012 International Residential Code documentation and manufacturing standard. Parallam PSL (IRC) is available in various grades as indicated in Table 1, with 2013 Abu Dhabi International Building Code (ADIBC) rectangular cross sections having a maximum thickness of 11 inches (279 mm), a maximum depth of 19 inches For evaluation for compliance with codes adopted by the (483 mm), and lengths up to 66 feet (20 120 mm). Cross Los Angeles Department of Building and Safety (LADBS), sections with depths up to 54 inches (1372 mm) are see ESR-1387 LABC and LARC Supplement. available through secondary lamination. See Footnote 13 to Properties evaluated: Table 1. Structural 3.4 TimberStrand LSL, TimberStrand LSL Rim Boards and RedBuilt LSL Rim Boards: Fire resistance TimberStrand laminated strand lumber (LSL), TimberStrand 2.0 USES LSL Rim Boards and RedBuilt LSL Rim Boards are The structural composite lumber and oriented strand board manufactured from wood strands that are oriented in a products described in this evaluation report are used as direction parallel to the length of the member and bonded alternatives to sawn lumber for wall, floor and roof structural together using an exterior-type structural adhesive. The members. These structural applications include use as wood species, properties, adhesives, manufacturing beams, headers, joists, rafters, columns, wall studs, and rim parameters and finished product tolerances are as specified boards. The products are also used as components of built- in the approved quality documentation and manufacturing up structural members, such as flanges for I-joists and standard. TimberStrand LSL is available in various grades chords for trusses, as detailed in a current ICC-ES as indicated in Table 1, with lengths up to 64 feet evaluation report. TJ® Rim Board and Weyerhaeuser Rim (19 500 mm), thicknesses of 1.25 to 5.50 inches (31.8 mm Board are used for rim board applications only. to 140 mm), and depths up to 48 inches (1219 mm). ICC-ES Evaluation Reports are not to be construed as representing aesthetics or any other attributes not specifically addressed, nor are they to be construed as an endorsement of the subject of the report or a recommendation for its use. There is no warranty by ICC Evaluation Service, LLC, express or implied, as to any finding or other matter in this report, or as to any product covered by the report. Copyright © 2021 ICC Evaluation Service, LLC. All rights reserved. Page 1 of 10 ESR-1387 | Most Widely Accepted and Trusted Page 2 of 10 TimberStrand LSL Rim Board and RedBuilt LSL Rim Board 4. One flat washer must be used between the deck ledger are available in a 1.3E grade, with lengths up to 48 feet and the lag screw head. (14 630 mm), thicknesses of 1.25 to 1.50 inches (31.8 mm 5. Adjustment factors in accordance with the NDS must be to 38.1 mm), and depths up to 24 inches (610 mm), as applied as applicable. indicated in Table 4. TimberStrand LSL having a grade of 1.6E or lower may contain finger joints. TimberStrand LSL For nail and bolt connections other than those described may be treated with zinc borate (ZB), as specified in the in this report, specific approval by the authority having approved quality documentation and manufacturing jurisdiction is required. standard and is additionally identified with a StrandGuard® 4.3 Fire Resistance and Fireblocking: stamp (see Figure 5). For TimberStrand LSL product 4.3.1 TimberStrand® LSL, Microllam® LVL and identified with a StrandGuard® stamp, the design guidelines Parallam® PSL: For applications under the 2018, 2015 and and properties for TimberStrand LSL noted in Section 4, 2012 IBC, the fire resistance of exposed Timberstrand LSL, Section 5 and Tables 1-4 of this report shall be used. Microllam LVL and Parallam PSL members may be calculated in accordance with Chapter 16 of the 3.5 TJ® Rim Board and Weyerhaeuser Rim Board: ANSI/AWC/AF&PA NDS. TimberStrand LSL, Microllam LVL TJ® Rim Board and Weyerhaeuser Rim Board consist of and Parallam PSL of equivalent sizes to that of sawn lumber either laminated strand lumber (LSL) (described in Section may be substituted for sawn lumber in fire-resistance-rated 3.4) or oriented strand board (OSB). The OSB consists of floor and roof assemblies, as specified in Table 721.1(3) of wood strands that are oriented at varying angles with the 2018, 2015 and 2012 IBC. respect to the length of the member, and bonded together 4.3.2 TimberStrand® LSL: TimberStrand LSL wall studs using an exterior-type structural adhesive. The wood without finger joints may be used in the one-hour fire- species, properties, adhesives, manufacturing parameters resistance-rated wall assemblies specified in Table 721.1(2) and finished product tolerances are as specified in the of the 2018, 2015 and 2012 IBC as direct replacements for approved quality documentation and manufacturing ® non-fire-retardant-treated 2-by-6 sawn lumber studs, standard. TJ Rim Board and Weyerhaeuser Rim Board are subject to the following conditions: 1.125 inches (28.6 mm) thick, and are available in depths ranging from 9.50 to 16 inches (241 to 406 mm). They are 1. The studs must have minimum cross-sectional available in lengths ranging from 8 to 24 feet (2440 to dimensions of 1.5 inches (38 mm) by 5.5 inches 7315 mm), as indicated in Table 4. (140 mm). 4.0 DESIGN AND INSTALLATION 2. Tape and joint compound must be applied to all fastener heads and gypsum wallboard joints on exposed 4.1 General: surfaces. The design and installation of Weyerhaeuser structural 3. The design axial compressive stress within the composite lumber and oriented strand board products must TimberStrand LSL studs must not exceed the least of comply with this report and the report holder’s published the following: installation instructions. Design of the structural composite a. 435 psi (2998 kPa). lumber products described in this report is governed by the applicable code and the ANSI/AWC National Design b. 0.30Fc', where Fc' is the compression design value Specification® for Wood Construction (NDS). In the event of parallel-to-grain for the LSL, adjusted by all a conflict between the report holder’s published installation applicable adjustment factors in accordance with the instructions and this report, the more restrictive governs. NDS, including the column stability factor, CP. ® ® Reference design values for Microllam LVL, Parallam c. 0.30Fc', where Fc' is calculated in accordance with ® ® PSL, TimberStrand LSL, TimberStrand LSL, Rim Board, the NDS, assuming a slenderness ratio Le/d of 21. ® RedBuilt LSL Rim Board, TJ Rim Board, and TimberStrand LSL having a minimum net thickness of Weyerhaeuser Rim Board are given in Table 1. 1.25 inches (31.7 mm) may be used in fireblocking 4.2 Connections: applications, as an alternative to the nominal 2-inch-thick (51 mm) sawn lumber noted in Section 718.2.1(1) of the The design of mechanical connections for Microllam® LVL, 2018, 2015 and 2012 IBC, and Section R302.11.1(1) of the Parallam® PSL, TimberStrand® LSL, TimberStrand® LSL IRC. Rim Board, RedBuilt LSL Rim Board, TJ® Rim Board, and Weyerhaeuser Rim Board must be in accordance with the 4.3.3 TJ® Rim Board and Weyerhaeuser Rim Board: NDS. Equivalent specific gravities for nailed, screwed, TJ® Rim Board and Weyerhaeuser Rim Board may be used bolted and lag screwed connections are given in Table 2. in lieu of sawn lumber for fire blocking. Minimum nail spacing, and end and edge distance 4.3.4 TimberStrand® LSL with Flak Jacket® FRT requirements, are given in Table 3. Nailing requirements for Protection: TimberStrand® LSL with Flak Jacket® FRT the attachment of wall sheathing are given in Section 4.5.
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