What are the different situations that one must be conscious of when dealing with water and concrete? The first and most common situation is direct contact. This is when water is directly exposed to the pores and cracks of the concrete, such as puddled directly at the base of the slab. This can cause immediate capillary action. The next situation is condensation, which occurs at the sub-slab/soil interface. This is when the temperature causes humidity to occur and the water condenses at the base of the concrete. The next situation is in situ water, which is when the water is trapped within the concrete itself. This can be avoided if the concrete has been mixed and cured properly. The last and most obscure situation relates to the movement of vapor molecules. In very small spaces, vapor molecules have a greater probability of attaching to each other. When this happens, van der Waal forces take over and condensation can occur. Overall, all these situations must be considered when dealing with concrete because they can cause debonding.