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Why do some bricklayers cover their work in hot weather?

I've seen brickies laying brick, block and stone on various occasions in hot weather. They put a wet hessian sack over their work after they're done. Why?

9 Answers from MyBuilder Bricklayers

Best Answer

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.


Answered 17th Feb 2011

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. :)


Answered 17th Feb 2011

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.


Answered 6th May 2016

Hi there,

The reason for this is because the sun dries out the cement too fast and makes it go powdery.

Thanks Paul


Answered 17th Feb 2011

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.


Answered 18th Feb 2011

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


Answered 19th Feb 2011

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


Answered 7th Jul 2011

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


Answered 17th Feb 2011

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


Answered 11th Mar 2011

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