CMU Block Walls
Mountain Grout Strong
CMU (block) walls present a unique challenge compared to poured concrete walls. They often experience seeping leaks in small voids between the mortar and the block, but exhibit no obvious cracks. Additionally, waterproofing membranes are often not installed during construction, especially in residential basements and older commercial buildings.
Finally, the blocks are most often hollow, making it even more difficult to inject resin into the specific void area without accidentally filling the void in the block and potentially causing damage to the CMU wall. Therefore, the most common application method using polyurethane resin is to create a grout curtain along the back side of the wall to stop leaks before they reach the CMU wall.
The biggest advantage to the curtain grouting method is that no expensive excavation is necessary on the positive side of the wall. Grout Curtains can be installed behind the wall whether or not a waterproofing membrane was installed during initial construction. Installers can drill through the failing mortar from the negative side and pump grout with low pressure through packers into the voids and soilon the positive side. The polyurethane resin reacts with the moisture present in the soil and void to react and form an impermeable barrier, keeping the water where it belongs and the subgrade wall dry.
It is important to remember that polyurethane doesn’t make water go away. Grout curtains merely stop waterfrom infiltrating voids in walls. Installers (and owners) should be prepared for the groundwater to build head pressure and find a new void if one exists. Therefore, a large grid pattern covering the greater area around a wet spot on the wall is recommended to avoid “chasing” the water for several installations.
If a grout curtain is properly installed, it should mean the end for damp walls, mold, and other common problems associated with subgrade CMU walls.
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