Sandblasting is often used when removing paint from bricks. It is an effective but harmful method. After peeling the last layer of paint, a large part of the thickness of brick is also removed. Besides, the surface of the sandblasted brick become porous, uneven and has an unnatural appearance of a sponge. As a result, such bricks absorb more water from the environment. Consequently, the balance in the natural moisture circulation cycle is disturbed. Such bricks retain more moisture, which reduces their thermal performance and can cause damp inside the building.