If you’re looking for a how to fill a void under concrete slab foundation method, you may have come to the right place. There are various methods, including urethane foam, sand, or a cement grout mixture. We’ll discuss each strategy below. To begin, you should pump the material through the holes at a pressure of 10 psi. Next, switch hoses and repeat the process until the void is filled.
Polyurethane foam is a highly effective method for stabilizing concrete slab foundations. Injecting this material through tiny holes in the foundation walls, the foam expands to fill the voids and seal them. This process is also beneficial for discrete sections of damaged slabs. While it’s possible to repair a gap by breaking up the concrete over the affected area, the void is very likely to reform.
Another method of lifting concrete is called mud jacking. It involves strategically drilling holes in the concrete slab foundation and injecting the material into the voids. The process typically takes 24 to 48 hours and costs 25% to 50% less than replacing the concrete slab foundation. This method is also significantly less expensive than URETEK’s polyurethane foam in filling voids under the concrete slab foundation. However, it is slower and requires more cleanup than foam. In addition, it creates one to two-inch holes in the concrete slab, which means that weeds can grow through it.
To fill a void in a concrete slab foundation, you must first measure the void’s volume. Then, mix a mixture of cement, fly ash, and sand. Use a special additive to expand the variety. Then, place the sand mix under the slab foundation and compact it. Repeat this process for the remaining sections of the slab.
When filling a …