![]() ![]() The bed is the mortar upon which a brick is laid. Parts of brickwork include bricks, beds and perpends. Most of the building standards and good construction practices recommend the volume of holes should not exceed 20% of the total volume of the brick. Perforated bricks have holes through the brick from bed to bed, cutting it all the way. Cellular bricks have depressions exceeding 20% of the volume of the brick. Frogs can be deep or shallow but should never exceed 20% of the total volume of the brick. The depression is called a frog, and the bricks are known as frogged bricks. Bricks might have a depression on both beds or on a single bed.
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