Tar Heel Tip of the Week: What is Slab Settlement?

Monday, December 19th, 2016 by Jaimie Hooker


Simply stated, slab settlement is the movement a concrete slab experiences when the soil below can no longer support the weight of it.

Most likely the soil changed. While there are many reasons the soil may change underneath your concrete slab, there is one common reason: changes in soil’s moisture content.

Two very common soil types are sandy and clay soil. slab settlement is the movement a concrete slab experiences when the soil below can no longer support the weight

Sand

Moisture does not have a big effect on sandy soil. When sand gets wet it doesn’t expand in size, and when it is dry it doesn’t shrink. But sand does wash out…

Clay

When clay is wet, it holds onto the water and expands in size. When it is dry, it shrinks. Imagine how dramatic this is when several feet of clay soil exist below your concrete slab– whether it be your driveway, patio, or beneath the concrete floor in your home!

Soil can dry out for several reasons, including drought conditions, tree roots drawing valuable moisture from the soil, and leaking HVAC systems under your floor slabs. In any case, as the soil beneath your concrete slab shrinks in size, it creates an empty space for the slab to settle into. The result? Cracked and unlevel concrete.

Conveniently, Tar Heel Basement Systems provides a non-disruptive solution for your sinking slab called, PolyRenewal™. To learn more about PolyRenewal™ or to schedule your free estimate appointment, call our office.

 

About the author
Jaimie Hooker is the Assistant Marketing Director at Tar Heel Basement Systems; authoring case studies, technical papers, creating and captioning photo albums and managing website content. She also oversees the organization of video testimonials, shows and events, Jaimie lives in the small town of Madison, NC with her husband, Paul, and 3 year old son, Franklin.