Engineered wood

People can make new wood.

They take wood bits like chips or strands. They mix them with glue. Then they press them together. This makes strong wood panels.

Some wood uses whole logs. Others use scraps from a mill. This helps use all the wood. Some products use straw or cane too.

This wood is very useful. It can replace steel or concrete. It can build big roofs. It even helps build tall buildings.

It is a smart way to build.

People can make new wood. This is called engineered wood.

It is made by joining wood parts together. These parts can be fibers, chips, or thin sheets called veneers. People use glue to bond them. They can also use other ways to fix them together.

There are many kinds of engineered wood. Plywood is a very old kind. It uses layers of thin wood sheets. These layers are placed in different directions. This makes the panel very strong. Another kind is oriented strand board, or OSB. It uses long wood strands. These strands are laid in layers to make a solid board.

Some products use wood scraps or sawdust. This is a good way to use all the wood. Some products even use plant fibers like straw or cane. Some wood is used to make mass timber. Mass timber is used for big building parts. It can replace steel or concrete. It can even be used to build tall buildings. Some mass timber is very safe during a fire. A black layer forms on the wood to protect the inside.

Engineered wood is a special kind of man-made wood.

It is not just a single piece from a tree. Instead, it is made by joining many smaller wood parts together. People use things like strands, fibers, or thin sheets called veneers. These parts are fixed together using adhesives, which is a fancy word for glue. This way of making wood creates a material that is very predictable. Builders can trust it to be strong and even in its shape.

There are many ways to make these products. For plywood, workers take thin sheets of wood called veneers. They glue them together under heat and pressure. They also turn the grain direction of each layer. This is called cross-orienting, and it makes the panel very stiff. For oriented strand board, or OSB, they use rectangular wood strands. These strands are laid into mats and bonded with heat-cured glue. The outermost layers often have strands pointing in the strongest direction.

People have used different types of engineered wood for a long time. Plywood is often called the original engineered wood product. Some types of mass timber have existed for over one hundred years. Mass timber is a group of large wood parts used for big buildings. It has become much more popular since the year 2012. This is because people want to build in ways that are more sustainable. They also like that these parts can be made in a factory before they reach the building site.

Different products serve different jobs in our world. Particle board is made from wood chips or even sawdust. It is often used for furniture that is not meant to hold huge weight. Some mass timber products can even replace steel or concrete. Cross-laminated timber, or CLT, is a newer type of multi-layered panel. In 2021, new building codes allowed mass timber to be used for tall buildings. These buildings can be as high as 18 stories!

You can see engineered wood in many places every day. It is used to make flat-pack furniture that is easy to carry. It is also used for floor and roof parts called I-joists. By the year 2004, about 81% of wood light framed floors used these I-joists. Even some products use things that are not wood at all. They might use bamboo or fibers from wheat and rice straw. This shows how many clever ways we have to use plants to build our homes.

Engineered wood is a broad category of manufactured wood products. It includes materials made by binding wood elements together with adhesives. These elements can be strands, particles, fibers, veneers, or boards. This process creates composite materials designed to meet precise specifications. Because they are engineered, these products offer uniformity and predictable structural performance.

This predictability makes them essential for modern construction and industrial goods.

The manufacturing process varies depending on the specific product being made. To create wood-based panels, manufacturers use a binding process with adhesives. For example, plywood is made from sheets of cross-laminated veneer. These layers are bonded under heat and pressure using moisture-resistant adhesives. To maximize strength, manufacturers use a technique called cross-orienting. This means they alternate the grain direction of the veneers from one layer to the next. This method increases both the stiffness and the strength of the panel in multiple directions.

Other products use different types of wood components to achieve specific goals. Oriented strand board (OSB) uses rectangular wood strands arranged in layers. These strands are laid into mats and bonded with heat-cured adhesives. In OSB, the strands in the outermost layers are often aligned in the strongest direction. Fiberboard, such as medium-density fibreboard (MDF), is made by breaking down wood residuals into fibers. These fibers are combined with wax and a resin binder. The mixture is then formed into panels using high temperature and pressure.

Engineered wood can be categorized into structural and non-structural types. Wood structural panels, like plywood and OSB, are used for decking, cabinetry, and sheathing. Structural composite lumber (SCL) is another important class. SCL includes products like laminated veneer lumber (LVL) and parallel-strand lumber (PSL). Unlike structural panels, SCL products generally have all grain fibers oriented in the same direction. These are used for heavy-duty items like rafters, beams, and columns. Non-structural panels, such as particle board, are used for furniture. Particle board is made from wood chips, shavings, or sawdust pressed with a synthetic resin.

Mass timber is a specific group of large structural wood components. These components are made of lumber or veneers bonded with adhesives or mechanical fasteners. Some types, like glue-laminated timber, have existed for over one hundred years. Mass timber has grown in popularity since 2012 due to sustainability concerns. It is also useful for prefabrication, where parts are made off-site. This allows for faster construction because the pieces arrive pre-finished to exact dimensions. Mass timber can even replace concrete or steel assemblies in large buildings.

There are several notable examples of advanced mass timber technology. Cross-laminated timber (CLT) is a versatile multi-layered panel made of lumber. Each layer is placed perpendicular to the adjacent layers to increase rigidity. Another type is dowel-laminated timber (DLT), which is sometimes called Brettstapel. DLT is a "wood-on-wood" method that uses no glue or metal. Instead, it uses holes to fix the lumber in place, which eliminates certain chemicals. Another example is the I-joist, an "I"-shaped member used in floors and roofs. By 2004, approximately 81% of all wood light framed floors were framed using these I-joists.

The significance of these materials is reflected in modern building regulations. Mass timber has shown structural properties that are competitive with steel and concrete. It also has natural fire resistance because a char layer forms around the wood. This layer protects the inner wood from the fire. Because of this performance, the 2021 International Building Code allows mass timber in high-rise construction. These buildings can reach heights of up to 18 stories.

This development connects wood science to the future of urban architecture and sustainable city design.