How To Fill Void Under Concrete Slab

Smaller slabs such as walks can be packed with gravel or sand to fill voids but this is not practical for larger slabs such as driveways or patios.

How to fill void under concrete slab.

Slabjacking is as the name might suggest raising up all or part of a concrete slab. Rather than using a mechanical jack as you might with a car soil and other material is used. A sand cement grout can be used to fill voids under concrete slabs. Once there voids are difficult to fill.

Connect a hose to a slabjacking pump then run the hose to the holes leading to the void. How to fill voids under a concrete slab step 1. Drill at least four holes through the slab at a point that s centered on the void beneath. This is a means of filling voids underneath concrete slabs by injecting pumping filler materials into the defective areas.

There are several ways to fill material under a concrete slab and remove voids. Filling voids under concrete slabs can help ensure the slabs will not sink or settle into the voids and prevent the need to replace concrete slabs. There are several conventional and alternative void filling materials which can be employed to achieve a similar effect.