Fly ash bricks are of cement color while the colour of Clay bricks differs from burnt red to light brown depending on the type of clay used for manufacture of the bricks. Fly Ash bricks are cast in moulds hence are always of uniform shape. Clay bricks are handmade causing slight difference in their shape and size. Fly Ash bricks have a very smooth finish hence plaster is not required on the bricks to create a smooth surface. Clay bricks require plastering. Clay bricks are more porous than Fly ash bricks. Fly ash bricks are lighter in weight and less costly than Clay bricks.
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