When brick laying, there are special precautions you should be aware of and information you should know when working in extreme temperatures or climates. Your installation and work may need slight alterations, especially when working with brick and mortar in humid, tropical climates.
Wetting the Brick
In tropical climates, you need to wet your bricks before stacking and applying the mortar. If you do not wet the bricks prior to installing, the bricks can suck the moisture from the mortar leaving an undesirable or less effective bond from the mortar to the brick.
Because tropical climates have such a high humidity rate and moisture content in the air, there can be affects of the climate upon the drying times of mortar used in bricklaying. When using mortar in tropical climates, the added moisture in the air can vastly slow the drying time of the mortar. Therefore, an elongated drying time should be expected. You should not stack layers of brick upon wet mortar in tropical weather until you have allowed adequate drying time for the lower levels of mortar.
The humidity of tropical weather can also help bricklayers by giving the mortar added working time. Since the air is not dry, the mortar can stay pliable longer. The added moisture in the air of tropical climates keeps the mortar moisturized longer adding working time to each batch of mixed mortar.