Void Filling

Our unique process for void filling employs an array of special high density expanding polymer resins which are typically injected through small 5/8″ diameter holes drilled through a concrete slab; into voided soils conditions such as blast rock; into annular spaces; or any other spaces or voided areas requiring void filling. As the resin mixture expands, voids are filled and a controlled mold pressure is exerted on a limited ( 8′ — 10′ diameter) area. The aggressive nature of our resins not only effectively fill voids but will also effectively seal and help in the prevention of water infiltration.



Void Filling

Our hydro-insensitive polymer resins work equally effectively in filling voids in wet substrates. The composite material quickly cures to a strong, stable and long-lasting replacement base material. Once our crew has completed their work and left the work area, the treated area is immediately ready for normal traffic use.

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Void Filling

In treating any large void condition (depths exceeding one foot) care has to be taken in addressing the void with expanding polymer resins given the exothermic characteristic of the expanding resins. Application of too much expanding resin could result in charring and even self-combustion. Poly-Mor Canada Inc. has an expanding resin system that is specially formulated to prevent heat build-up and the possibility of starting a fire. This affords Poly-Mor Canada Inc. the advantage of filling large voids on a continuous basis thus greatly decreasing the time required to fill the voids. We also are aware of the relatively low melting points of plastics such as polystyrene, polypropylene, etc. Any void filling where products such as these are present, care must be taken to ensure that the exothermic heat produced in the formation of our expanding resins do not melt or otherwise damage these components.

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A Closer Look At Void Filling


Void Filling

When addressing a void condition, Poly-Mor Canada typically uses an array of 5/8″ holes drilled through the floor slab. We then use Poly-Mor’s high-density polyurethane foam and inject it to fill the voided areas and provide and re-establish a firm foundation for the floor system. 

Void Filling


Void Filling

When erosion, washout, or settlement causes voids to occur, it can create serious damage to nearby infrastructure. Many types of infrastructure are at risk, including:

• Voids under concrete pavement
• Areas under washed out bridge approach slabs
• Sink holes
• Behind replaced bin wall panel
• Culverts and pipes
• Catch basins and manholes
• Abandoned culverts, ducts and pipes
• Annular Space Fill – Tunnels, culverts, Bin Walls, Retaining Walls
• Trench fill
• Behind Bridge abutments





With the Poly-Mor Technology, it is possible to correct all manner of void filling problems relating to floors, foundations, roads, bridge abutments, walks, driveways, etc. No matter what the void fill issue is!


The Challenge:

A large warehouse complex in North York, Ontario experienced a flood due to a fire line break under a floating slab-on-grade floor structure. The fire line break resulted in a significant wash-out beneath the floor panels as evidenced when a small section of the floor slab was removed. Subsequently, a consultant was engaged and a G P R survey of the area was undertaken to determine the extent of the void condition. 

The Solution:

Poly-Mor Canada was called in to address the void condition and based on the G P R analysis the treatment area was determined. An array of 5/8″ holes were drilled through the floor slab and Poly-Mor’s high-density polyurethane foam was injected to fill the voided areas and provide and re-establish a firm foundation for the floor system. 

Should you have any void-filling, slab-lifting or soils stabilization challenge call us for a free estimate 
CASE STUDY - Warehouse
Void Filling

Bridge Approach Voiding 

The Challenge 

Routine inspections uncovered significant void conditions beneath a bridge approach on a main B.C. highway. This voided area extended over 25 meters (85’) by 8 meters (26’) traversing some six lanes of traffic. Concern was raised that if the void was not filled slab settlement would become an issue in the future. The real challenge, however, was the engineering team did not want the foam injection to be undertaken traditionally by drilling 5/8” holes through the approach slab and the foam then injected. To inject the polymer system to a length of some 45’ was the real challenge because of the fact the two-component system sets up so fast it would plug up within the injection probe. Could Poly-Mor meet the challenge? 

The Solution:   

YES, YES, and YES!! Using some 20 years of experience and one of Poly-Mor’s special expanding polymer systems – MISSION ACCOMPLISHED! Crews worked from the excavated sides of the highway injecting our expanding polymer resin from up to a 48-foot distance to fill from the center moving out towards the ends; Crews effectively void-filled and consolidated soils beneath the bridge approach. All the work was done without any surface drilling or impeding traffic on the busy stretch of the highway – traffic was moving at regular speeds with full lane usage all while this structurally expanding polymer was remediating a necessary and otherwise more invasive, time-consuming and costly repair. 

Bridge Void
Bridge Void filled with foam



When weakened surface structures or soils collapse as a result of water soluble rock being dissolved or base soils at depth are washed out, Poly-Mor can inject its high density hydro-insensitive expanding polymer resin into the impacted area and quickly and effectively remedy the dangerous condition replacing the “washed out” soils with a material that will be significantly stronger that the soils it is replacing; AND, all within minutes.

Should you have a challenge with a SINK HOLE or any other void condition, please give us a call and we would be privileged to provide you with a free quotation to undertake remedial action.

CASE STUDY - Sink Hole void
Sink hole being filled with foam by Poly-Mor worker
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