brown coat
brown coat — 名詞
1. In traditional three-coat plastering, the second layer applied over the scratch
中塗層
三層粉刷系統中的第二層
In traditional three-coat plastering, the second layer applied over the scratch coat and underneath the finishing coat. It is usually brownish in colour because the sand and cement or lime give it that tone, and it serves as the main structural layer that creates a flat, level surface.
The contractors let the scratch coat dry overnight before applying the brown coat the next morning.
承包商讓粗塗層風乾一整晚，隔天早上才上中塗層。
temporal sequence: scratch coat → brown coat
A plasterer keeps the brown coat evenly thick, about ten millimetres, to avoid cracks later.
泥作師傅讓中塗層保持均勻厚度，約十毫米厚，以免日後出現裂縫。
collocation: brown coat + evenly thick / [measurement]
If the brown coat is too thin, the finishing coat may not bond to the surface properly.
如果中塗層太薄，面層可能無法牢固附著於表面。
The building inspector checked the brown coat for straightness before the finishers were allowed to start.
建築稽查員檢查了中塗層的平整度之後，才允許粉光師傅開工。
用法筆記
This term is almost exclusively used in discussions of traditional three-coat plastering systems. In modern construction, single-coat or two-coat systems are more common, so the word appears mainly in renovation or historic-building contexts.