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Questions and Answers
What is another name for fiber cement board?
Which material is composed of 72% Portland cement and 20% mineralized cellulose fibers?
What is the major reason for glue-laminating wood?
In glue-laminated wood, what is done to lower the moisture content before lamination?
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What is the abbreviation for Cross-laminated timber?
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How are the end joints typically joined in engineered wood lumber?
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What is the common thickness range for engineered wood lumber?
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What is the main advantage of hardboard over solid wood?
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Which engineered wood product is made from shredded wood strands and pressed into a rectangular cross-section?
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How is chipboard typically constructed?
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Among engineered wood types, which one is identified as the least strong and least expensive composite lumber product?
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Which of the following engineered wood types is known for its approximate equalization of strength properties along its length and width?
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What distinguishes laminated strand lumber (LSL) from oriented strand lumber (OSL)?
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What is a common characteristic of medium density fiberboard (MDF)?
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Which engineered wood product is made from thin wood veneer sheets glued and laminated into thicker members?
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Which type of engineered wood board is most suitable for exterior use due to its waterproof glue?
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For what purpose is laminated strand lumber (LSL) mainly used?
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In engineered wood, what is the main disadvantage of reduced protection against aggressive or resistant species?
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Study Notes
Engineered Wood
- Engineered wood boards are made to provide a permanent form in the casting of gypsum concrete roof decks
- Types of gypsum boards include:
- Wallboard
- Type X gypsum board
- Core board
- Water-resistant backing gypsum board
Engineered Wood Lumber
- Glue-laminated wood, also called glulam wood, is made by joining smaller strips of wood with glue
- Major reasons to laminate: size, shape, and quality
- Wood is seasoned before lamination to lower than the usual desired moisture content, 12%
- Most common individual laminations are 2 inches (50mm) nominally thick (1 ½ in/38 mm)
- Adhesives are chosen according to moisture conditions under the member is subjected to
- Layers are oriented along the length of the lumber
- End joints are either scarf-jointed or finger jointed
Cross-Laminated Timber (CLT)
- CLT is a structural panel made from solid lumber, specifically dimension lumber, each layer glued perpendicular to the previous
- Wood is seasoned before lamination to lower than the usual desired moisture content, 12%
- Planed or sanded before assembly to ensure good wood-to-adhesive bonding
- Full stack is compressed in a hydraulic or vacuum press, then cured
- End joints are finger-jointed
- Made up of an odd number of layers for a balanced structural behavior
- Common thickness range from 2 ¼ to 16 inches (57-400 mm), widths range from 4-15 feet (1220-4500 mm), and lengths from 40-60 feet (12-18 m)
Structural Composite Lumber (SCL)
- SCL is a product substitute for solid lumber made from wood veneers or wood fiber strands and glue
- Includes laminated strand lumber (LSL), oriented strand lumber (OSL), laminated veneer lumber (LVL), and parallel strand lumber (PSL)
- LSL and OSL are made from shredded wood strands, coated with adhesive, then pressed into a rectangular cross section, and cured under heat and pressure
- LVL is made from thin wood veneer sheets, as wide as the member is deep, that are glued and laminated into thicker members
- LVL has higher shear strength than LSL and OSL
- More expensive than LSL and OSL but more affordable
Plywood
- Plywood is a composite wood product made by binding or fixing wood components together with adhesives
- Constructed by layering or arranging wood components in specific orientations to enhance structural strength and stability
- Exhibits excellent strength and dimensional stability, with reduced warping, twisting, and shrinking compared to solid wood
- Types of plywood include:
- Soft plywood for form lumber
- Hardwood plywood for paneling and finishing work
- Marine Plywood or Exterior Grade Plywood for exterior use where waterproof glue is used
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Description
Learn about the manufacturing process of engineered wood including steps like planing, gluing, pressing, and curing. Understand the characteristics and specifications of engineered wood products.
