What is the minimum temperature at which masonry should generally not be laid?

Masonry should generally not be laid at temperatures lower than 4 degrees Celsius. When the temperature drops to this level, the risk of water in the mortar freezing increases significantly. This freezing can lead to improper hydration of the cement, which can compromise the bond strength and overall integrity of the masonry assembly. Furthermore, when masonry is laid in cold conditions, there is a greater chance of thermal shock and cracking due to rapid temperature changes.

It is also essential for the mortar and ambient conditions to allow for proper curing, which is vital for achieving the desired strength and durability. Maintaining a temperature above 4 degrees Celsius helps in ensuring that the masonry can properly set and cure without the adverse effects associated with colder temperatures. This practice helps ensure the longevity and performance of the masonry work.