Case Studies: Graham, NC – Sinking Garage Slab Raised with PolyRenewal

Wednesday, December 16th, 2015


The garage floor in this Graham, NC home had began to sink over the years. Not only was the slab sinking, it was drooping drastically at an angle along the back of the garage compared to the front entrance of the garage floor.  The slab had sunk so unevenlly the homeowner’s could no longer use the space for storage. The homeowner’s had decided that total slab replacement was not an option they wanted and called Tar Heel Basement Systems.


Slab Specialist, Rick Brown, completed the full inspection of the sinking slab, notating the fill soil under the garage slab was failing and moving under the slab causing the sinking slab to become worse over the years. Rick advised a solution that would meet the homeowner’s needs of lifting the slab, but would also stabilize the fill soil without replacing the concrete or causing major disruption to the area.

PolyRenewal Foreman, Bobby Luttrell, began the stabilization and lift process by drilling penny-sized holes every few feet along the sinking slab. Each hole was injected with structural grade polyurethane, lightweight foam. After the soil void is filled, the polymer properties are then expanded allowing for an accurate lift of the garage slab floor. The small holes are then grouted and sealed, becoming unseen.

The homeowners were excited that the garage floor was now level and they were able to move the storage shelves back onto the now stabilized slab just minutes after the lift. Their garage is now restored and looks like new thanks to Tar Heel Basement Systems!

Project Summary

Installing Contractor: Tar Heel Basement Systems

System Design Specialist: Rick Brown

Products Used: PolyRenewal