Concrete Basement Crack Leaks Can Be Stopped With Polyurethane Molding

Do you love your basement? I'm sure like many others you do. Why not as these basements are generally use as entertainment centers, recreational rooms, or even as storage areas. It is critical these basements must be kept dried and cleared. Unfortunately the cracks in the walls of basement are common and they cause the water to seep in.

What Is The Cause Behind These Concrete Basement Cracks: It is common for concrete o crack. Have you ever thought what the cause behind these cracks is? While building concrete foundation concrete mixed with water is poured in the shape of liquid. The water is then removed as concrete cures. If the water is removed it causes concrete to shrink in its volume. The moment concrete shrinks it start to appear as crack. One common form of this crack is generally termed shrinkage crack. These cracks are generally 3/8 inches in their width.

The Points Of Concrete Basements Crack: Shrinking generally stops at the topmost of the wall of basement. It finally goes all he way till it reaches floor. Common points of shrinking cracks are the corner points of window and the center of the long wall specifically from the point where foundation start to step down. Generally these cracks are vertical.

How Does Water Seep in The Cracks: Soil releases some amount of water. This water enters the cracks. When the crack reaches outside via wall, water enters these cracks during rainy season.

This Leakage Of Water Can Be Stopped With Polyurethane Molding: Leakage of water can be stopped with the help of polyurethane molding. This can be done with the help of polyurethane injections. This work is preferably done from the inner side of the basement wall. It is not an expensive process

Polyurethane Foam: It is injected in the cracks as liquids. On the inside of the crack it starts to expand by foaming. This is the greatest advantage of using polyurethane for stopping water leakage. This foaming action causes polyurethane liquid to expand so it can fill any empty space. The foam seals out any water from the basement wall.

How Polyurethane Injection Are Injected

Step # 1: The ports of plastic injection are joined with specific epoxy directly n the cracks. These ports are fixed after ever 6 to 12 inches.

Step # 2: Once these ports are properly attached the remaining crack is properly covered with epoxy. This is not to make the crack waterproof; rather it helps to keep polyurethane in proper place when it begins to foam.

Step # 3: The process of injecting starts from lowest surface. A mixer attached with polyurethane cartridge is properly inserted in port. It is liquid form and freely flows in cracks. It flows towards the outside the crack as well. Once you notice polyurethane coming out of next port you have to stop injecting in current port and then move to next one. A plug is then inserted in first port for keeping liquid polyurethane away from leaking. Go on repeating the same until all parts have been properly injected.


  • Polyurethane molding injections cannot be used for filling concrete block walls
  • These cannot be used for the floor cracks