Rinzaffo

Rinzaffo is a term used in Italian plastering techniques, specifically in the context of applying traditional lime-based plasters. It refers to the initial layer or scratch coat that is applied to the substrate before the final layers of plaster.

The purpose of the rinzaffo is to provide a solid and level base for the subsequent layers of plaster. It is typically a mixture of hydrated lime, sand, and water, sometimes with the addition of other natural additives such as fibers or pozzolans. The consistency of the rinzaffo is usually thicker than the subsequent layers, allowing it to adhere well to the surface and provide a good key or grip for the plaster layers.

The rinzaffo is applied by hand using a trowel or a float, and it is worked onto the substrate in a thin layer. It is then scratched or scored with a comb-like tool or a scratcher to create a rough texture. This rough surface helps the subsequent layers of plaster bond securely to the rinzaffo layer.

Once the rinzaffo layer has cured and dried, additional layers of plaster, such as the intonaco or the final decorative finish, can be applied on top. These layers build upon the solid foundation provided by the rinzaffo, resulting in a durable and long-lasting plaster system.

The use of rinzaffo in traditional lime plastering techniques is important for achieving a high-quality and durable finish. It helps to ensure proper adhesion, even application, and structural integrity of the plaster system. Additionally, the rough texture created by the rinzaffo allows for better keying of subsequent layers, promoting a strong bond between the layers of plaster.

Rinzaffo plays a crucial role in the application of lime-based plasters, serving as the initial layer that prepares the substrate and provides a solid foundation for the subsequent layers. It is an integral part of the traditional plastering process and contributes to the overall strength, durability, and aesthetic quality of the finished plasterwork.