Concrete is one of the most durable and stable building materials. However, even concrete buildings can be brought to their knees. Moisture is always a culprit in damage to concrete. When water freezes and thaws, the damage can be extensive. Water also acts as an undesirable transport medium for aggressive substances, such as the chloride ions present in road salt. Furthermore, it serves as a medium in which reactions can take place and as a reagent in destructive chemical processes, foremost among these being the corrosion of reinforcing steel. The best way to afford permanent and reliable protection for concrete is to use SILRES^® BS products that prevent water from being absorbed in the first place.