A rough coating of plaster scratched before it is quite dry to ensure the adherence of the next coat.
〈北美〉打底水泥沙浆，底子灰，水泥沙浆底涂层
Example sentencesExamples
Mix and apply slurry coat to the existing scratch coat ahead of the render application ensuring that the render is squeezed into the wet slurry coat.
First, a scratch coat is troweled onto the lath; the plaster oozes through the lath and grips the backing when it hardens.
On smaller buildings, I combine the slip and scratch coats by making one sloppy, high clay-content plaster and mush that directly into the bales.
After it becomes tacky, the first scratch coat of polymer cement is applied.
A typical historic plaster system is made out of three coats: a base or scratch coat, a brown coat, and a finish coat which contains less sand and gives the wall its smooth finish.
Definition of scratch coat in US English:
scratch coat
noun
North American
A rough coating of plaster scratched before it is quite dry to ensure the adherence of the next coat.
〈北美〉打底水泥沙浆，底子灰，水泥沙浆底涂层
Example sentencesExamples
First, a scratch coat is troweled onto the lath; the plaster oozes through the lath and grips the backing when it hardens.
A typical historic plaster system is made out of three coats: a base or scratch coat, a brown coat, and a finish coat which contains less sand and gives the wall its smooth finish.
On smaller buildings, I combine the slip and scratch coats by making one sloppy, high clay-content plaster and mush that directly into the bales.
Mix and apply slurry coat to the existing scratch coat ahead of the render application ensuring that the render is squeezed into the wet slurry coat.
After it becomes tacky, the first scratch coat of polymer cement is applied.