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Difficulty: MediumLumber and Engineered Wood

A carpenter is installing a heavy load-bearing header above an extra-wide opening in a residential frame. The structural plan specifies an engineered beam manufactured by bonding multiple thin wood veneers together under heat and pressure, with the grain of all veneer layers running parallel along the longitudinal length. Which of the following engineered lumber products is being specified?

  1. A
    Oriented strand board (OSB)
  2. Laminated veneer lumber (LVL)Answer
  3. C
    Glued laminated timber (glulam)
  4. D
    Medium-density fiberboard (MDF)

Answer

Laminated veneer lumber (LVL)
Laminated veneer lumber (LVL) is an engineered wood product made by stacking multiple thin wood veneers (typically 1/10 inch1/10\text{ inch} to 1/8 inch1/8\text{ inch} thick) coated with waterproof adhesive and consolidating them under pressure. Because the wood grain of every veneer layer runs parallel to the long axis, the resulting beam offers superior bending strength, dimensional uniformity, and resistance to warping, making it ideal for structural headers and beams.

Step-by-Step Solution

1
Identify the manufacturing components described in the structural specification
The material consists of thin rotary-peeled wood veneers bonded with exterior adhesive under heat and pressure.
Engineered wood products are differentiated by their raw wood form: whole dimensional lumber, thin veneers, strands/flakes, or individual wood fibers.
2
Analyze the grain orientation and structural application
All veneer layers have their grain oriented in parallel along the length of the member to maximize tensile and bending strength along the beam span.
Unlike plywood which alternates veneer grain at 90∘90^\circ angles for panel shear strength, laminated veneer lumber (LVL) aligns all grain longitudinally to act as a high-capacity beam, header, or joist.

Key Concept

Manufacturing characteristics and grain orientation of engineered lumber products
Estimated Time:1m 0s
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Topics

Lumber and Engineered Wood

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