Unless water is pouring out of the crack, you will need to inject clean water through the injection port and into the crack.

The port is what seals the hole and gives the injection pump a direct connection to the crack. Put a flexible hose all the way to the back of the hole so that water flushes the dust from the back of the hole to the surface of the concrete. If you don’t flush this dust out of the holes, it will be forced into the crack during injection and may clog the crack, preventing resin from getting where it needs to go. When you drill, you create concrete dust. These holes are usually drilled at a 45 degree angle to intersect the crack halfway through the structure so that the resin is forced towards the front and back of the crack. Use a hammer drill to drill holes in the concrete that intersects the crack. In future articles, we will explore every one of these steps in more detail and address the multitude of options (such as port selection, hole spacing, depth, what to do when you hit rebar, etc.) But for right now, we are going to discuss the most basic steps. Learn these steps and you will be well on your way to understanding what it takes to seal a water leak in concrete with products such as Spetec PUR F400, Spetec PUR F1000 and AP Seal 500. There are five basic steps to be done when injecting a crack in concrete that is leaking water.

How to break down crack to inject