Concrete Joints are often the areas of the concrete that starts breaking down first. This is due to the extreme weight transfers and pressures that the concrete slabs undergo during the movement of heavy loads and vehicular traffic. Joints are essential in concrete as they allow slabs to move naturally, so as to not crack under the weight of the load and its transfer. You also find saw cuts in the concrete, as this induces the natural cracking that occurs, and helps reduce it going in any direction it desires (like a spiders web) leaving neat straight lines through the floor. Joints and cuts should be sealed, normally with a mastic joint sealant (different varieties are available for different applications e.g. fuel and chemical resistant) as this helps support the joint edge under traffic and stops water penetration that could damage the concrete from within. With R&J, you have peace of mind knowing that any repairs undertaken are done so that they resolve the issue entirely leaving you to focus on your normal day to day business.