What bricks are marriage: signs and nuances
Requirements that exist to the appearance of the facing bricks are quite strict: the front side of this material should not be with chips, spots, fences and other external defects, which can be visible at a distance of ten meters in the open space and in the presence of daylight.
Those cases are recognized as a marriage when the brick firing mode is violated. The signs of “short -burned” include the mustard color of the brick and a dull sound if you hit it. The result of such a marriage will be low water resistance and frost resistance. If the brick, on the contrary, “burned out”, then black plunges and violation of the correct shape will be visible on the brick. The result of such a marriage is increased density and thermal conductivity, which will entail a rapid heat leak from the room.