What Environmental Conditions Are Related To The Formation of Watermarks on Cement Boards?

The formation of watermarks on cement boards is closely related to environmental conditions such as humidity, temperature, precipitation, ventilation, and lighting, which play a role by affecting the process of water migration and evaporation.

Humidity is the core driving factor, and high humidity environments (such as basements and bathrooms) can keep cement boards moist for a long time, making it difficult for water to evaporate and promoting the migration and accumulation of soluble substances with water to form watermarks; The humidity difference on both sides of the board can cause moisture diffusion, for example, when the back contacts a damp wall, moisture migrates to the dry surface and leaves a mark after evaporation.

Temperature affects watermarks by regulating the moisture state, and high temperatures accelerate surface moisture evaporation, making it easy for soluble substances to form obvious watermarks on the surface; Low temperature slows down evaporation and may cause substances to form hidden watermarks inside. The large temperature difference between day and night can also cause micro cracks in the board, increasing the channels for water infiltration.

Precipitation and condensed water directly provide water sources, while rainwater and snowmelt infiltrate through cracks, and long-term accumulation of dew seeps into the surface, forming corresponding marks after drying.

Ventilation conditions determine the evaporation path, and when ventilation is good, moisture evaporates rapidly on the surface, forming a clear boundary watermark; Poor ventilation leads to the migration of moisture to deeper layers, forming a blurred diffuse watermark.

Light accelerates water evaporation by heating up, and may also expand surface micropores, accelerating penetration. Long term light exposure can also deepen watermarks due to repeated dry wet cycles.