**3. Types of engineering wood and their use**

Engineered wood, which is also known as industrial wood and composite wood. It is a wood product derived from wood waste and by-products such as sawdust. In fact, these waste woods undergo changes and transformations using heat, glue, and pressure to obtain a suitable and usable replacement for natural wood.

Engineered wood is considered a very prominent development in the production of building materials. Which has many advantages compared to natural wood. Since wood waste is used in the construction of engineered wood. (As a result, there is no need to cut more trees). From the point of view of the environment, they are not only harmful, but they are also friendly and preserve the environment.

The thickness and density of this type of wood can be ordered based on the needs and goals of the project. In addition, engineered wood has high strength. This type of wood can be easily manipulated and cut with simple tools and skills [18].

Wood is one of the most efficient and useful materials that has been available to man since ancient times. Since the beginning of creation, man has used stone and wood as the first building materials. In total, three types of wood are used to make wooden accessories. These three types include soft wood-hard wood-engineering wood. If you take a quick look around you, you will see that most of your things are made of wood, and most of this type of wood is made up of engineered wood. If you do not know what type of engineered wood your bed, desk, chair, and any of these home appliances are, then stay with us. What kind of wood is called engineering wood? The reason for the engineering name of this type of wood is that the production process of such wood is designed precisely. This type of wood is the result of using waste and can be said to be a by-product of wood. The collected wastes are connected utilizing heat and glue. Of course, engineering wood is also known by names such as composite and industrial wood. Due to its very interesting and appropriate structure, engineered wood created a huge change in the construction of wooden materials and decoration [19].

## **3.1 Types of engineered wood**

### *3.1.1 Laminated board*

Several thin layers of wood are placed on top of each other and these thin layers are connected at different angles using glue. As mentioned before, this wood board is formed by stacking thin sheets on top of each other. It is recommended to use an angle of 45 degrees to overlap the thin layers in the construction of these boards; Because the angle of 90 degrees cannot provide enough resistance for multi-layer boards. Therefore, we connect the thin layers at an angle of 45 degrees. This prevents easy bending and twisting of the wood [20]. This type of wood is shown in **Figure 2**.

**Figure 2.** *Laminated wood [21].*
