Does the aerated block need to be covered in rainy days?

Need. According to the query of Tubatu Decoration Network, aerated blocks have high water absorption rate, which will affect the quality of aerated blocks after rain, especially in the case of heavy rain. But it doesn't mean it can't be used after getting wet. You can pass the random inspection, and you can still use it if you are qualified. So when the weather is not very good, you can cover the aerated block yard with canvas to avoid unnecessary losses.