Why do some bricklayers cover their work in hot weather?

This is a practice used to delay the rapid drying of the mortar, which will cause poor adhesion between the bricks, as its the moisture in the sand & cement mixture which creates the bond. the hardness of motar is created by chemical process not by the drying action.

A good bricklayer would cover his work during any weather. Covering during hot weather is purely for the mortar to cure properly to give the best possible build/strength. The same should be done in overcast or rainy weather to protect from potential rain. When I'm building houses I like to do as much work following the sun round if possible to keep in the shade, sounds crazy but it really does make all the difference.

Hi, This is so the hot weather doesn't dry out the mortar to quick and cause cracking, which will result in a weak product. :)

Hi there, The reason for this is because the sun dries out the cement too fast and makes it go powdery. Thanks Paul

This is carried out in the summer month,s to stop the mortar drying out to quickly in the direct sun light and to stop it from cracking or powdering. As in bad weather it is covered to stop the rain from washing the mortar out of the joints.

a chemical reaction has to happen before it dryes out it is not just a question of the commpo drying out

In the summer months, this is to slow down the drying process, were as in the winter is to protec against freezing. i.e. frost and low tempretures

stops the cement drying out to quick. and protects it if it rains. roy

to stop the mortar drying out to quick stop cracking and protect against rain