Before revision: Contemporary masons in many countries must attend trade school and/or serve apprenticeships in order to complete curriculum signifying that that they understand fundamental related concepts such as the effect of humidity and water ingress, thermal insulation, and general knowledge regarding the science of construction material, as well as occupational health and safety.
After revision: Contemporary masons in many countries must attend trade school and/or serve apprenticeships in order to complete curricula signifying that that they understand fundamental related concepts such as the effect of humidity and water ingress, thermal insulation, and general knowledge regarding the science of construction material, as well as occupational health and safety.