Double deck block board is a type of engineered wood product that is made by sandwiching a core of wooden blocks or strips between two layers of veneer. The wooden blocks or strips are typically arranged with their grains running in the same direction and are bonded together with adhesive to create a solid core.

The veneer layers on either side of the core are usually made from a hardwood such as Birch, and are used to provide a smooth and attractive surface finish. Double deck block board is often used in furniture making, cabinetry, and interior finishing applications where a strong, stable, and aesthetically pleasing material is required.

One of the advantages of double deck block board is its dimensional stability. Because the wooden blocks or strips in the core are arranged with their grains running in the same direction, they tend to expand and contract together, which can help to minimise warping or twisting of the board over time. The use of hardwood veneer layers on either side of the core also helps to provide additional strength and stability, making double deck block board a durable and long-lasting material.