GPR- Void Locating
HMI- 402 DeepJection
Polyurethane Foam Injected
POLYURETHANEDEEPINJECTION
POLYURETHANE DEEP INJECTION
Bank Floor Settlement — Polyurethane Injection Stabilizes 1,100 sq ft Without Closing the Branch
The Problem
Soil settlement beneath the bank was now causing the interior floors to crack — and there were growing concerns that the freestanding vault in the center of the building might begin to settle as well. The damage was threatening a recent remodel, and any significant disruption to daily banking operations was not an option.
Traditional solutions — removing and replacing the settled floor areas — would have closed the branch down for weeks. The client needed a better answer.
The Diagnosis
Foundation Tech was contacted to survey the problem and engineer a repair that was cost-effective and non-disruptive. Because we had already performed foundation work at this site a few years earlier, we had the geotechnical report on hand — which showed the subsurface was a very sandy loam. That existing data accelerated the diagnosis and allowed us to move straight to designing the right solution.
After evaluating the conditions, we determined that polyurethane deep foam injection would provide the stability and volume needed to support the interior floors — while keeping the floor, the vault, and daily operations completely intact.
The Approach
Foundation Tech agreed to perform all repair work after hours so the branch could continue serving customers without interruption. Plumbing repairs were completed in coordination with the injection work.
The execution included:
- GPR mapping of the subsurface voids to determine precise injection starting points
- Identification of 1,100 square feet of floor area requiring lifting and stabilization
- Drilling 5/8-inch injection holes at 2-foot intervals, carefully placed to intersect grout seams in the recently installed flooring
- Removal of carpeted areas prior to injection
The Outcome
Over the course of the project, Foundation Tech injected 16,000 pounds of HMI 402 deep injection polyurethane foam through 250 rods placed into the concrete. Injection rods were inserted to depths of seven feet and three feet in each hole, with approximately 30 pounds of foam delivered through each rod.
The foam expanded rapidly to fill voids and compress the surrounding sandy loam, substantially increasing the soil’s bearing capacity. An added benefit: the cured foam created a water block that protects against future soil erosion beneath the structure.
The branch remained fully operational throughout the project. The floor was stabilized, the vault was protected, and the recent remodel was preserved — all without a single day of closure or disruption to the bank’s customers.
Additional HMI 402 foam was injected directly beneath the slab to fill remaining voids and lift the floor back to level.
The entire project was completed in five days. Injection holes were filled with epoxy and grout matched to the existing floor finish. All site protection and debris was removed — and the branch was left cleaner than we found it.
While onsite, our crew also measured the floor elevation differential to check on the ECP-PPB-300 push piers Foundation Tech had installed two years earlier. As we suspected, nothing had moved.
The client was reassured to see the earlier repair holding perfectly — and has since recommended Foundation Tech on other projects.
Contact Us
The Repair You Need Today Will Cost Less Than the Emergency You’ll Face Tomorrow.
Foundation Tech’s sales engineers are ready to evaluate your foundation or concrete issue, identify the most effective repair method, and deliver a comprehensive proposal with scope, timeline, and pricing.
Don’t wait for a small problem to become a shutdown.
[Talk to a Sales Engineer Today] · (661) 294-1313
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