Joints play an important role, the primary function of joints is to allow movement due to temperature changes, settlement, and other factors. Without joints, the structure would be susceptible to cracking, buckling, and other forms of damage.

Here are some of the key reasons why joints are important:

Minimizes Cracking: Joints help to minimize cracking in the concrete by providing a controlled location for the concrete to crack. This helps to ensure that any cracking that does occur is in a predetermined location and does not compromise the structural integrity of the building.

Allows for Movement: Joints allow for movement in the concrete due to temperature changes, settlement, and other factors. This helps to prevent stress buildup in the concrete, which can lead to cracking and other forms of damage.

Improves Durability: Properly designed and installed joints can help to improve the durability of the concrete by minimizing damage and reducing maintenance requirements.

Overall, joints are an important component of floor and RCC structures. They help to minimize damage and ensure the durability and safety of the building. It is important to work with a qualified engineer or contractor to design and install joints properly to ensure the best results.