Uniform Thickness Slab

Uniform thickness concrete slabs are sometimes specified for use on expansive soil.  They are usually very thick and require more reinforcement, whether post-tensioned cables or rebar, as required by building codes and accepted design practice, in order to provide the necessary reinforcement strength for the large mass of concrete.

When expansive soil expands under a uniform thickness slab it has nowhere to go, so the foundation is pushed upward.  Incorporating the Wafflemat System with the uniform thickness slab can reduce concrete volume and the amount of reinforcement, because the Wafflemat foundation efficiently uses these two materials.

Most importantly, Wafflemat absorbs the volume change of the expansive soil.  The use of non-expansive fill is not required with Wafflemat.

Uniform Thickness Slab:

Uniform Thickness SlabUniform Thickness Slab with Wafflemat:

Uniform Thickness Slab With Wafflemat

Using Wafflemat™ with Uniform Thickness Slab

With Wafflemat:Without Wafflemat
Absorbs volume change of expansive soil, thereby reducing uplift forcesExpansive soil is in contact with the entire foundation, and pushes the foundation slab upward
More efficient use of concrete and reinforcement materialsMore concrete and reinforcement materials are required
Non-expansive fill is usually not requiredNon-expansive fill is used to attempt to reduce uplift forces of expansive soil