There are different types of pipes passing through foundation walls that bring water, gas, waste, and electricity in and out of our homes. Some of these pipes pass through special “sleeves” that help seal off water seepage. Unfortunately, many are “sealed” the old fashion way, from the inside with hydraulic cement. This is a “negative-side” attempt of waterproofing and frequently fails. Many times the cement is only applied around the wall surface/pipe with very little actually applied inside the wall hole.
When the ground gets saturated, water fills the hole in the wall around the pipe and exerts pressure on the cement seal. Since concrete doesn’t bond to concrete very well and it hardly bonds to PVC, plastic or copper at all, the water easily finds its way into your basement. Since exterior excavation down to the level of most of these pipes is cost prohibitive, many choose to try and fix it with more hydraulic cement, paint, caulking, or even spray-on coatings in a can. We fix it from the inside too, but our process is a little different.
Our method of repair is based on the concept of filling the gap around the pipe with a waterproof material, sealing all avenues and pathways that the water can take to the inside of your basement. This is done using the process of Urethane Grout injection. Urethane Grout is liquid expansive foam that reacts with water to create highly dense foam resistant to water penetration. The Grout is injected into the annular space (gap) around the pipe deep inside the wall. The Grout then experiences an expansive reaction creating a driving pressure around the pipe. This pressure forces the foam through any crack, gap, or fissure leading into the pipe penetration. In most cases, the pressure drives the foam grout into the soil around the pipe creating a diversion barrier for the water. With a 10-year Warranty against water penetration, this process is guaranteed to work better that fourth coat of cement!