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the first use for laminated veneer lumber was for

LVL is considered to be a highly reliable building material that provides many of the same attributes associated with large sized timbers. are left on each veneer sheet, random distribution of such defects during veneer assembly } The manufacturer’s name or product identification and the stress grade is marked on the material at various intervals, but due to end cutting it may not be present on every piece. compared to other structural engineered wood-based products. fine cracks on the loose side of veneer due to lathe checks running parallel to the The history of wood veneering originates in ancient Egypt circa 3000 BC and continues into modern day woodworking. With the focus on conservation, using veneers to cover man made materials such as particle board and MDF has become a necessity if rare and hard to find species of trees want to be used at all in furniture making. Products Laboratory did a substantial amount of research related to improving its [4][5] The first explorations into engineered lumber happened during World War II in the United States. The war industry utilized a panel material developed by the Homasote Company of Trenton, New Jersey, made of wood pulp and ground newspaper, to be used in place of siding and sheathing for buildings. Some of the biggest names in furniture have used different versions of veneering techniques to produce museum-quality pieces that can come with impressive price tags. The breakdown of LVL end uses in North America is 33% new single family residential construction, 25% residential renovations and upkeep, 8% new non-residential construction and 34% manufacturing furniture and other products. However, it was in the nineteenth century that veneering started to develop a bad reputation when some furniture manufacturers were using machine made veneers mainly as a method of covering up badly constructed furniture made of cheaper pine or poplar wood. It is typically used for headers, beams, rimboard, and edge-forming material. Due to its composite nature, it is much less likely than conventional lumber to warp, twist, bow, or shrink. Veneer is not a modern invention. In general, LVL production is similar to that of structural plywood; however, the This LSL is also made from strands rather than veneer, although the strands are shorter and aligned with less precision than PSL and is created as billets that are like a thick version of oriented strand board. Douglas fir is the most commonly used raw material for LVL manufacture, Laminated veneer lumber is used in all new-build and renovation work and for industrial purposes. As a result, veneers came into being where no large forests marked the landscape, but instead in a place where timber, as a raw material, was rare and its products were highly sought after. Laminated veneer lumber (LVL) is an engineered wood product that uses multiple layers of thin wood assembled with adhesives. "Micro=Lam LVL" consisted of laminated veneer lumber billets 4 feet (1.2 m) wide, 3 1⁄2 inches (89 mm) thick, and 80 feet (24 m) long. Today, hardwood veneers are as thin as 1/64 of an inch! Forest Products and Wood Science. It also has the great advantage of using wood resources efficiently. Parallel strand lumber (PSL) is a form of engineered wood made from parallel wood strands bonded together with adhesive. LVL can also be used in combination with gluelam as an outer gluelam tension lam to increase the strength of the gluelam beam. Billets of PSL and LVL are very similar although their sizes are different. Common elastic moduli are 12 GPa (1,700,000 psi); 13 GPa (1,900,000 psi); and 14 GPa (2,000,000 psi); and common allowable bending stress values are 19 MPa (2,800 psi); and 21 MPa (3,000 psi). (Ed.) [10][11], LVL is commonly manufactured in North America by companies that also manufacture I-joists. defect, such as warping, if it is not properly stored in the warehouse. SPF is used to make dimensional lumber for home building and panel as well as in engineered wood products such as plywood, oriented strand board, laminated veneer lumber, glued laminated timber and cross laminated timber. Defects on each veneer are eliminated during the clipping process. Some of the most popular uses of LVL include I-joists, header, rimboards, truck bed A deck built using pressure-treated LVL collapsed due to internal rotting of the twelve-year-old LVL components, although the LVL beams had passed regular visual inspections. Compared to plywood press, LVL presses are longer. Blackwell Publishing: Boston, Massachusetts. Veneers were then used to cover cheaper substrates instead of using solid wood. the logs is carried out on a lathe, which incorporates geometry and positioning of It is typically used for headers, beams, rimboard, and edge-forming material. [14]. Solid wood is a term most commonly used to distinguish between ordinary lumber and engineered wood, but it also refers to structures that do not have hollow spaces. length of 80 feet. The biggest notable difference from dimensional lumber is that the I-joist carries heavy loads with less lumber than a dimensional solid wood joist. A deck built using pressure-treated LVL collapsed due to internal rotting of the twelve-year-old LVL components, although the LVL beams had passed regular visual inspections. [2] While plywood became widespread by the early 20th century, the invention of LVL was not until the 1980s after the invention of oriented strand board. Figure 2 Together with plywood, The fact that a product is made from solid wood is often touted in advertisements. It is a composite product manufactured from multiple In 1942, an increased demand for wood caused a sudden timber shortage. In the case of LVL, more veneers are assembled along the Although the craft of veneering was practiced in classical antiquity, its use in Europe was sparse during the Middle Ages. LVL is manufactured to sizes compatible with the depth of I-joist framing members for use as beams and headers. [1], Structural composite lumber, including LVL, are a relatively recent innovation. LP pioneered the U.S. production of oriented strand board (OSB) panels. In LVL, the direction of the wood grain is always parallel to the length of the billet. A bolt, which is a short log depending on its diameters, may take 5 to 10 seconds [7]. [16], LVL belongs to the category of engineered wood called structural composite lumber. [2] While plywood became widespread by the early 20th century, the invention of LVL was not until the 1980s after the invention of oriented strand board. "mainEntity": [{ It is an engineered wood from the family of manufactured boards which includes medium-density fibreboard (MDF) and particle board (chipboard). Common applications of LVL in construction include headers and beams, hip and valley rafters, scaffold planking, and the flange material for prefabricated wood I-joists. batch-type or continuous. Billets of PSL can be as large as 12 inches (300 mm) wide and 60 feet (18 m) long while LVL can range up to 4 feet (1.2 m) wide and 80 feet (24 m) long. because each lamina is parallel to the board axis, as illustrated in Figure 3. However it was still mainly used by craftsmen to build fine furniture. and custom-made panels for marine uses. Due to its composite nature, it is much less likely than conventional lumber to warp, twist, bow, or shrink. There are many LVL is a solid, highly predictable, uniform lumber product due to the fact that natural defects such as knots, slope of grain and splits have been dispersed throughout the material or have been removed altogether during the manufacturing process.

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