What's the ratio of interior wall plastering to exterior wall plastering?

Generally, the plastering cement mortar ratio between the inner wall and the outer wall of plastering works is 1:3, and the strength grade is generally M5.0 or M7.5, so it needs to be sampled for inspection. According to different operations, plastering mortar can be divided into on-site mixing mortar and ready-mixed dry powder plastering mortar. Plastering mortar with different functions is also applied to different wall foundations, such as plastering mortar suitable for holiday concrete blocks and fly ash blocks, which can be directly scraped on the surface of concrete shear walls.