Eliminating Trip Hazards

Sunken Slabs Create Trip Hazards

One of the first reasons a sunken slab is often noticed is because it’s created a trip hazard. The Americans with Disabilities Act (ADA) defines a “trip hazard” as any vertical change over a ¼ inch or more at any joint or crack. Cities, school districts, hospitals, churches, shopping malls, universities, apartment complexes, homeowner associations, large buildings, and private residences should all be concerned with this liability.

Concrete Leveling with Polyurethane

Eliminating these hazards and avoiding litigation is as simple as hiring a contractor who is using the right concrete leveling technique and material. Ground Consolidation Services lifts and levels slabs using Alchemy-Spetec’s line of AP Lift products. These high-density polyurethane lifting foams are used in a wide array of applications from lifting walkways to lifting highway bridge approach slabs on DOT projects.

Slab Lifting vs Slab Replacement

In addition, GCS has specialized tools in our bag like the jack system we use to mechanically manipulate the smaller, harder-to-control slabs. The only other viable option to lifting the slabs, in most cases, is the removal and replacement of them. This option is generally much more expensive and certainly more time-consuming and intrusive. We often do jobs for customers who have gone that route in the past and every single time they say they wish they had known that GCS was an option. We are usually done within a few hours, with the treated areas being traffic ready immediately.

Lifting a Sidewalk at a Shopping Mall in Buckhead

GCS is working with the Atlanta shopping mall Shops of Buckhead to solve settled walkway issues around that upscale property. In the picture included with this post, you’ll see a large sidewalk slab that has been lifted back to its original level. The surrounding small slab panels will then be reset to their original level by the property owner.

Stabilizing the Soil with Polyurethane

To get this large sunken slab lifted, we began with subsurface deep injections of Alchemy-Spetec’s AP Lift 430 to stabilize and tighten soft inadequate soil. Probe spacing of 4-5 feet on-center proved to be more than adequate to densify the soil. Once the root of the problem was taken care of, we were able to move on to lifting the slabs back to a level that pitches water away from the building.

Lifting the Slab with Polyurethane

With the now stable soil being compact, we injected AP Lift 430 foam directly through the slabs via ⅜ inch injection holes. The slabs began lifting right away and the clients were not only happy the project was a success but really enjoyed watching the process unfold. It is always a good day when your customers are present and part of the excitement! Give us a call for a free assessment of any soil or sunken concrete issues. We’d love to help!

Void Fill Under Pool House in Atlanta

Sometimes we run into situations where we just can’t reach a remote work site with our larger equipment truck, in spite of having over 200 feet of pump hose on board. This is where the PolyBadger mobile unit comes in handy. The PolyBadger, manufactured by Alchemy-Spetec, is a tough and compact mobile cart system for pumping polyurethane resin. With the pump, a generator, and a compressor, we’re able to perform a slab lifting, soil stabilization or void fill job virtually anywhere. This includes both remote outdoor locations and the inside of large facilities.

On this particular job we were called in by a contractor who is restoring a very interesting pool house in the upscale Atlanta area of Northside Drive. The pool actually sits atop and in the center of the pool house. During the initial restoration process, they discovered voids under the pool house foundation. Obviously, that was a concern to say the least. Once we got the PolyBadger set up, we made quick work of filling the voids with AP Lift 475, a high-density polyurethane foam. After a few short hours, we were finished and out of the way, so the restoration crew could start backfilling the area.

Permeation and Compaction Grouting in Peachtree City

In Peachtree City, a water line recently broke and went undetected for a lengthy period of time, causing large amounts of soil to wash towards a nearby retention pond. This was especially problematic since it occurred underneath a large retaining wall that supports a large retail store! Settlement of the back corner of the building led to the discovery of the deeper and profoundly serious issues below.

A contractor installed helical piers (steel foundation pins) around the back corner of the building. The GCS crew then performed deep injections of Alchemy-Spetec’s AP Lift 430 in a curtain pattern to compact loose soil around the piers and prevent any future lateral movement. To remedy the washed-out soil issue along the drainpipe that feeds the retention pond, the GCS crew also did a series of probe injections (driving grout probes down 13 feet to essentially straddle the pipe).

The crew then injected AP Soil 600 to permeate and squeeze the unstable soil as well as fill any voids created by the washout. This repair took a few days. Could you imagine how much time and money it would take to rebuild a 20’x150’ retaining wall?!

Call us now at 678-337-8374 for a free assessment of any soil or settlement issues.

Lifting an Office Park Entry Slab in Norcross

Ground Consolidation Services received a call from a facility manager in Norcross, GA about an uneven walkway in a high-traffic office park entryway. He scheduled an appointment as soon as possible, well aware that potential trip hazard litigation could be costly.

The GCS crew arrived at the office park and immediately began the repair. We used Alchemy-Spetec’s AP Lift 430 high-strength polyurethane foam and super-easy Jack Attack System, specifically designed for manipulating small slabs. Once the slabs were injected with AP Lift 430 that compacted loose soil and filled any voids underneath, they were lifted back to their original level position.

The facility manager thanked GCS for lifting an enormous weight off his shoulders. Now he could get back to business without worrying about any trip hazards!

Void Fill Under Dining Room Floor in Decatur

Recently, a concerned homeowner in Decatur, GA reached out to Ground Consolidation Services about a busted water line beneath his dining room. As often happens this issue went undetected for a lengthy amount of time. A plumber had to cut out a portion of the concrete floor in order to repair the leaking pipe. As the homeowner suspected, severe erosion had taken place under the foundation slab, leaving a sizable void—as much as a 1’ in some areas. After the pipe was repaired, the concrete was replaced. But the homeowner shared a photo with us of the cut-out area in the middle of his dining room.

The GCS crew arrived at the house and conducted a thorough inspection via small drill holes in order to determine the exact size of the void. One possible option would have been to completely remove the slab and replace the concrete, a near-impossible task on an interior foundation slab. Instead, the team injected Alchemy-Spetec’s AP Lift 430 high-strength polyurethane foam through the slab through 3/8” injection holes, filling any empty space and compacting all the loose soil.

Thankfully, the GCS team was able to stabilize the soil and fill the void beneath the slab in just 1 hour. The owner was quite pleased.

Void Fill Under Parking Garage Entrance in Buckhead

Right before Christmas, the owner of a heavily trafficked commercial building in the Buckhead area of Atlanta, GA called in Ground Consolidation Services to fill sub slab voids in their parking garage entrance. Slab settlement coupled with cracking of the joint nosings led to the diagnosis. He was serious about getting the repair completed quickly. Cars needed somewhere to park!

The GCS crew arrived at the site and got right to work. We injected Alchemy-Spetec’s AP Lift 430 high-strength polyurethane foam through the slab, filling any empty space and stabilizing the entrance from any future settlement. The slab was also lifted back to its original level position.

Our experts were able to return the entrance to full functionality in just 1 hour, all while keeping the driveway open! The owner couldn’t have been happier.

Lifting a Garage Slab in East Cobb

This past week, a resident in East Cobb, GA reached out to Ground Consolidation Services about multiple cracks and settlement issues in his garage. Given that he parked his vehicle in his garage on a daily basis and used it to enter and exit his home, he was eager to get the slabs back in place. The GCS crew showed up for the appointment and inspected the entirety of the concrete slab. We observed that several sections had cracked, mainly as a result of poor compaction and seasonal freezing temperature fluctuations. To make matters worse, the cracked sections had sunk into the soil void underneath.

To repair the damage, we drilled non-invasive 3/8” holes through the slab and injected Alchemy-Spetec’s AP Lift 430 high-strength polyurethane foam. Once injected, the rapidly expanding foam compacted the loose soil underneath, filled in any remaining voids, and lifted the slab, curing to 90% in just 15 minutes. We also used a concrete polymer-blended material to seal cracks across the garage. The homeowner praised the GCS team for their speed and accuracy. He was even happier to have a level, crack-less garage!

Void Fill Under Stoop in John’s Creek

A homeowner in John’s Creek, GA recently reached out to Ground Consolidation Services after noticing a significant soil void under his front porch stoop. This is a common issue we see throughout the residential market across Georgia, usually as a result of poor drainage, grading, or a combination of both.

A typical way of tackling ongoing water-induced erosion is removing and replacing the stoop entirely, but this is incredibly costly and requires pulling out a perfectly well-built structure in the front of your home.

GCS, fortunately, offers a cheaper and wiser alternative. The homeowner called in GCS, and once on site, the crew recommended using Alchemy-Spetec’s AP Lift 430 high-density polyurethane foam to fill the void. We quickly drove injection pipes into the deepest part of the soil and filled the entire void with AP Lift 430. This expanding structural foam is known for compacting the surrounding soil and creating a solid, impermeable mass that will support the stoop for many years to come.

The resident was thrilled that GCS completed the repair in 1 hour, preventing not only a stoop collapse, but also a complete replacement!

Saving a Luxury Buckhead Penthouse from Costly Water Damage (Just in Time!)

Ground Consolidation Services was recently called in to seal off a rain-induced ceiling leak in a new construction high rise penthouse suite in Buckhead. Sealing off the water intrusion from the roof above was not an option, due to the rooftop swimming pool directly above the penthouse. So, we had to get into the ceiling from the interior of the suite and inject from the underside.

We injected Spetec PUR F400, a water-reactive, hydrophobic, flexible, single component polyurethane resin. This product is ideal for sealing off active leaks in cracks. In this case, the leak was shut down in less than two minutes. This all went down literally right before the new tenant was scheduled to begin moving in. (No pressure there!)

We are constantly amazed by the wide variety of scenarios in which we’re able to utilize these products. No two days are the same and they’re definitely never dull!