Pronunciation: [skɹˈat͡ʃ kˈə͡ʊt] (IPA) 
The word "scratch coat" refers to the first coat of plaster that is applied to a wall or ceiling. The spelling of the word is relatively straightforward, but it does feature a few unique sounds. The "scr" blend is pronounced as /skr/, and the "a" sound is pronounced as /æ/. The "tch" blend is pronounced as /tʃ/, and the final "coat" is pronounced as /koʊt/. Overall, the IPA transcription for "scratch coat" is /skrætʃ koʊt/.
A scratch coat is a term used in the construction industry, specifically in the field of masonry. It refers to a thin layer of mortar or plaster that is applied to a wall or surface before the actual finishing coat is applied. The purpose of a scratch coat is to provide a secure and rough base for the subsequent application of the final coat.
The term "scratch" originates from the action of scoring or scratching the surface of the coat, either horizontally or vertically, with a trowel or a notched tool. This scratching process creates small ridges and grooves, which helps to enhance the adhesion of the subsequent coat. It helps the final coat adhere more securely to the surface, preventing it from cracking or chipping.
When applying a scratch coat, the surface must be properly prepared and cleaned to remove any dirt, dust, or debris. Then, the mortar or plaster mixture is carefully spread using a trowel, ensuring an even distribution over the entire surface. Once applied, the surface is scored with the trowel, creating the necessary texture to improve adhesion.
A scratch coat is commonly used in various construction applications, such as masonry walls, stucco finishes, or even tile installations. Its important role lies in providing a mechanical bond between the surface and the final coat, ensuring the longevity and durability of the finished product.
Overall, a scratch coat acts as the foundation for a successful construction project, creating a strong and stable surface to support the subsequent layers of mortar, plaster, or finish.
The term "scratch coat" originates from the practice of plastering or rendering walls. In traditional construction, a scratch coat is the first layer of plaster applied to a masonry surface before the final coat. The name comes from the technique used to create a rough surface on the scratch coat by scratching it with a tool, such as a trowel or comb, to provide a better bond for the subsequent layers of plaster. The term "scratch" refers to this action of scratching the surface, while "coat" indicates the layer of plaster being applied.
