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Bricks are classified into five main types based on their application: facing bricks for structural and aesthetic purposes, building bricks for hidden wall sections, hollow bricks for lighter construction, paving bricks for durable surfaces, and firebricks for high-temperature environments like fireplaces. Each type serves distinct functional and structural roles in construction projects.

Facing bricks, also called face bricks, are designed for both structural support and visual appeal, making their appearance critical. Building bricks are typically used in concealed sections of masonry walls, such as behind facing bricks, where appearance is not a priority. Both are solid units, though their intended visibility distinguishes their application.

Solid bricks, including facing and building bricks, must have at least 75 percent of their load-bearing surface as solid material, though they can be fully solid, cored, or frogged. Hollow bricks contain up to 60 percent void space, making them lighter. These voids in hollow bricks allow for embedding and grouting of reinforcement bars in reinforced brick masonry applications.

Paving bricks are engineered to withstand abrasion and survive freeze-thaw cycles, where water infiltration does not cause damage upon freezing. This specialized design ensures durability in outdoor applications subjected to heavy foot traffic and environmental stress. Their resistance to both mechanical wear and temperature fluctuations makes them ideal for exterior surfaces.

Firebricks are specialized units designed to withstand extreme heat in high-temperature environments like fireplaces. They are installed using very thin layers of fireclay mortar, which provides superior heat resistance compared to standard mortar. This combination allows firebricks to maintain structural integrity under sustained thermal stress.

Hollow bricks reduce overall weight while their void spaces facilitate the insertion and grouting of reinforcement bars, enhancing structural integrity. With up to 60 percent of their volume as void space, hollow bricks provide a lighter alternative to solid units without sacrificing strength when properly reinforced, making them economical for larger structures.

The 75 percent solid requirement for load-bearing surfaces ensures that solid bricks, whether fully solid, cored, or frogged, maintain adequate structural capacity to support building loads. This minimum threshold balances material efficiency with structural reliability, allowing manufacturers to create cored or frogged bricks that reduce weight while preserving load-bearing capability.