What is a critical characteristic of water used in masonry?

The critical characteristic of water used in masonry is that it must be potable, which means it should be safe for drinking. Using potable water is essential because the quality of water directly affects the performance and durability of masonry materials, such as mortar and concrete. If non-potable water is used, it may contain impurities, chemicals, or contaminants that can adversely affect the hydration process and bonding of the cementitious materials. This can lead to weakened structures, poor workability, and premature deterioration of the masonry work.

Other options such as distilled water, chemically treated water, or heated water are not necessary for masonry applications. Distilled water might be overly pure and unnecessary for typical masonry work, while chemical treatments often introduce variables that can hinder the curing process. Heating water is generally not a standard practice for masonry and may not provide any significant advantages. Therefore, ensuring that the water is potable is paramount for achieving optimal results in masonry construction.