Cracks can come in all different sizes from hairline cracks that run a few feet to large structural cracks. They normally run vertically but sometimes run horizontally. The thickness of the epoxy we inject is determined based on the width of the crack. We use epoxy in its natural state for hairline cracks. For larger cracks we mix an additive with the epoxy to thicken it so it will not seep out of the crack. The thickness or viscosity of the epoxy needed is determined by the size of your crack and can vary per crack. To explain further, if you were to buy a do ¬it ¬yourself kit, they don’t supply the additive and therefore many times the crack is too big and the epoxy would run out of the crack. In most cases we inject 2, 3 or 4 different textures of epoxy into a single crack, because the thickness of a crack is often larger on top and gets smaller as it travels down. The reverse is also seen but not as commonly.
There are different techniques to set up a crack and the most common is to drill on the side of the crack and install injecting tubes. Our method is different (old school) in that we set up the injecting tubes directly onto the face of the crack. This insures that the crack won’t get “pinched” by the drill and that happens all too often on micro¬-hairline cracks. The set up takes a little longer but our trained technicians have the skill set to tackle any small micro hairline crack. The end result is that the crack is injected properly and completely. The tubes are spaced approximately 4 to 8 inches apart.
If possible, injecting a crack from the inside is not only less expensive but more effective. When injecting a crack from the inside, we would start the injection at the bottom, a few inches above the floor. The epoxy then travels in the crack and fills the crack up from the bottom first near the footing and towards the back (outside) where the earth that sits up against your foundation wall acts as a seal to keep the epoxy in the crack. The epoxy slowly fills the complete void until it begins to exit the next injecting tube. We then know that the space between the two tubes is completely filled with epoxy. We also then examine the texture of the epoxy to assure it is the right thickness. We continue this process until the entire crack is filled from bottom to top.
The difference in doing the injecting from the outside is that the tubes may be spaced closer together and the thickness of the epoxy might be changed more frequently in order to make sure the epoxy doesn’t drain when the job is completed. However in both cases, the crack is completely filled and structurally sound and waterproof.