What is crazing and why does it occur?
Crazing is defined as fine and random cracking extending only through the surface. Crazing is due to differential contraction between the surface and interior sections. Crazing can be caused by any factor which causes surface tension in excess of interior tension. Manufacturing causes include inadequate or improper curing, a surface film richer in cement and fines than the body of the concrete and plastic shrinkage cracking. Crazing can also be caused by design and installation factors which cause unusually high amounts of vapor transmission, excessive wetting and drying or inadequate ventilation behind the Cast Stone. There is some evidence that atmospheric carbonization can cause crazing. Crazing has no structural or durability significance For more information please refer to Cast Stone Institute Technical Bulletin # 32.
