Which type of brick is commonly used for exterior walls or above ground?

The choice indicating MW or SW is pertinent as it highlights the types of bricks that are suitable for use in exterior walls or above ground construction.

MW stands for Moderate Weight brick, which is designed to withstand various environmental stressors, making it an appropriate choice for exterior applications where durability is required. SW, or Soft Mud brick, while primarily used in some construction scenarios, often has specific properties that can make it suitable for certain exterior applications provided it meets the appropriate standards for durability and load-bearing capacity.

Bricks used for external walls must have adequate resistance to moisture and weather conditions, and both Moderate Weight and Soft Mud bricks can be treated or engineered to fulfill these requirements. This makes MW or SW a reliable option for projects where longevity and structural integrity against the elements are crucial.