LVL beams always have straight, parallel layers which is very different than similar Parallel Strand Lumber (PSL) beams which have lots of shorter fibers that are compressed. Is it safe to say that the Microllam properties in the mid-90s would have been similar to the 1988 brochure, or were there significant changes/innovations/new-product-offerings that occurred between those dates? I'm hoping that if this goes forward, and we open up the walls, that we might be able to glean a bit of additional info from whatever markings are on the beams themselves. The second clue to idendifying the LVL is the long, straight layers of the beams. I am currently limiting my work to a feasibility study to assess whether the client's desired renovation is doable without unreasonable demolition and reconstruction. The document title is "TJI 25, 35 & Microllam LVL - 1988.pdf" The properties for Microllam from that document are below (for context, roughly 50% of strength values for a top end modern LVL): The only resource that I could find online is this from Weyerhaeuser, dated 1988: Link. ![]() Learn more about BCI® Joists and our sizing software BC Calc® or view the US East and US West span and size charts. I do know that Microllam was the original LVL product, and I am guessing that they likely had one grade of the stuff, hence why the drawings just call it out as "1-3/4" x 11-7/8" M.L.". BCI®Joists are specially constructed I-joists with flanges made from strong VERSA-LAM® laminated veneer lumber with oriented strand board web and approved waterproof structural adhesives, providing outstanding strength and durability. Lateral support of beam compression edge is required at intervals of 24 o/c or closer. 3100Fb-2.0E 3 WEST FRASERLVL FACTORED RESISTANCES (STANDARD TERM) Design Property Depth 1. Knowing how the beam will be loaded (either side loaded or top loaded) and the overall application of the member will. The successful design and installation of engineered wood beams such as Microllam LVL, TimberStrand LSL and Parallam PSL goes beyond just looking up a member in a table. All 16 and greater beam depths are to be used in multiple member units only. Wood Beam Design and Installation Considerations. Trus Joist Support TJ-Pro Rating Satisfying Code for Fire Protection Requirements. Microllam® LVL 2.0E Microllam® LVL header and beam sizes: Width: 1¾' Depths: 5½'. Lateral support of beam is required at bearing locations. Microllam LVL Beams Microllam LVL Headers Resources. ![]() Parallam PSL Beams Parallam PSL Columns Parallam Plus PSL Microllam LVL. ![]() Having been in elementary school at that point in time, I don't have much personal context for the engineered wood product market back then. TimberStrand LSL Beams TimberStrand LSL Framing Lumber TimberStrand LSL Rim Board Parallam PSL. I've got a residential renovation project that I am kicking off here, and the original building drawings (from 1997) seem to call out Microllam LVL beams.
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