Engineered wood

Engineered wood—also known as mass timber, composite wood, man-made wood, or manufactured board—covers a range of wood-based products created by binding together strands, particles, fibers, veneers, or boards with adhesives or other fixing methods. These panels vary in size, with some reaching up to 64 by 8 feet, and cross-laminated timber (CLT) can be made in thicknesses from a few inches to 16 inches or more. Each product is built to precise design specs, tested against national or international standards, ensuring consistent and predictable structural behavior. They appear in everything from home construction to commercial buildings and industrial uses, often replacing steel for joists and beams, while mass timber can substitute for concrete assemblies. Machine grading evaluates and categorizes these wood products by mechanical strength and suitability for specific tasks.

The same hardwoods and softwoods used for regular lumber go into engineered wood. Sawmill scraps and wood waste can be turned into particle- or fiber-based products, but whole logs are typically used for veneers in plywood, medium-density fibreboard (MDF), or particle board. Some products, like oriented strand board (OSB), can use poplar, a common but non-structural species. Similar engineered materials can also be made from bamboo or other lignin-containing sources like rye straw, wheat straw, rice straw, hemp stalks, kenaf stalks, or sugar cane residue—these contain vegetable fibers rather than actual wood. Flat-pack furniture often uses man-made wood because it’s cheap to produce and lightweight.

**Types of products**

A wide variety of engineered wood products exist for both structural and non-structural uses. The list below helps categorize and distinguish them.

**Wood-based panels** These are made from fibers, flakes, particles, veneers, chips, sawdust, slabs, wood powder, strands, laminates, or other wood derivatives, bound with adhesives. Structural wood panels are flat products used extensively in building construction for sheathing, decking, cabinetry, millwork, and furniture—examples include plywood and OSB. Non-structural wood-based panels are used in non-structural construction and furniture, typically finished with paint, wood veneer, or resin paper—examples include fiberboard and particle board.

**Plywood** Often called the original engineered wood product, plywood is a structural panel made from sheets of cross-laminated veneer bonded under heat and pressure with durable, moisture-resistant adhesives. Alternating the grain direction between layers—cross-orienting—maximizes strength and stiffness in both directions. Other structural wood panels include OSB and structural composite panels.

**Oriented strand board (OSB)** OSB is a structural panel made from rectangular wood strands aligned lengthwise, arranged in layers, formed into mats, and bonded with moisture-resistant, heat-cured adhesives. Layers can be cross-oriented for strength and stiffness. Like plywood, most OSB panels are stronger in one direction, with the outermost strands aligned to that strongest direction—often indicated by arrows on the product. Produced in huge continuous mats, OSB is a solid panel with no laps, gaps, or voids, available in various dimensions, strengths, and water resistance levels. OSB and plywood are often used interchangeably in building construction.

**Fibreboard** Medium-density fibreboard (MDF) and high-density fibreboard (hardboard or HDF) are made by breaking down hardwood or softwood residuals into wood fibers, mixing them with wax and a resin binder, then forming panels under high temperature and pressure. MDF is used in non-structural applications.

**Particle board** Made from wood chips, sawmill shavings, or sawdust, combined with a synthetic resin or other binder, then pressed and extruded. Research from 2017 showed durable particle board can also be made from agricultural waste like rice husk or guinea corn husk. It’s cheaper, denser, and more uniform than conventional wood or plywood, and is used where cost matters more than strength or appearance. A major downside is its tendency to expand and discolor from moisture, especially without paint or sealer. Particle board is used in non-structural applications.

**Structural composite lumber (SCL)** This class of materials uses layers of veneers, strands, or flakes bonded with adhesives. Unlike wood structural panels, SCL products generally have all grain fibers oriented in the same direction. The SCL family is commonly used in the same applications as solid lumber.