We all have heard that concrete is like a sponge and soaks up everything, for example motor oil in a driveway. Stain/Waterproofing concrete to prevent motor oil from soaking into concrete is obvious because you don’t want to see a big dark stain, but what about waterproofing concrete to prevent water from soaking in? Water doesn’t leave a big ugly spot like oil does, so what is the benefit of waterproofing concrete. It turns out that water can damage concrete in more ways oil can, sure oil leaves an ugly stain, but water will soak deep down and begin to corrode the rebar causing areas of the concrete to spall off. Another reason why it is good to waterproof concrete, especially when areas are prone to have freezing rain, is that when water soaks into the concrete and then freezes it expands and will pit the concrete eventually the concrete will need to be replaced. So be sure to have your concrete waterproofed to prevent stains and also water damage.