If it looks like rain, what should you do to a masonry wall that was recently constructed?

When rain is anticipated shortly after the construction of a masonry wall, covering the wall with canvas is the best practice. Newly constructed masonry is particularly susceptible to the effects of water. Rain can hinder the curing process of the mortar or concrete, potentially leading to issues such as reduced strength, efflorescence, or even physical damage if water enters the pores and freezes.

Using a cover, such as canvas, helps to prevent direct exposure to rain, thereby allowing the wall to cure properly without negative interference from moisture. This protective measure safeguards the integrity of the structure, ensuring that the mortar or concrete can develop its intended strength over the required period.

Other options, such as leaving the wall exposed, would risk damage and compromise the quality of the construction. Spraying it with water does not offer protection from rain and could introduce additional moisture that could be problematic. Applying a sealant is more applicable after the curing process is complete and is not suitable for preventing rain damage during the initial curing phase.