Residential Polyurethane Foam Void Fill
& Slab Stabilization
Is Polyurethane Foam Void Fill Quick and Affordable?
Time-Sensitive, Cost Effective, Minimal Invasive
Erosion caused by the movement of water can lead to many structural issues on a residential property. Water can wash away improper fill and undermine the substrate below a slab. This can cause cracking on the slab or on a masonry exterior and lead to structural and cosmetic issues.
The back patio and three season room addition had begun to sink due to improper dirt work and erosion. The goal of the repair was to fill the voids under the structure with a high strength polyurethane void fill foam to reduce or eliminate further water ingress and to provide structural support for the sinking slab and structure.
The project required a quick, time-sensitive , minimal invasive and comparatively low cost solution.
After the injection cured foam was observed as it had emerged from fissures in the surrounding soil during the injection process. Although not a primary objective in this comparatively low cost repair, a slight lift of the structure was achieved.
Structure after injection - Voids are filled and lift of structure observed
System Used
SealBoss 1640 polyurethane void fill and polyjacking foam was pumped through the SLP-2C pneumatic dual component pump, and injected through 5/8 button head Packers for maximum material flow.
Powered by a 4 CFM air compressor, the SLP-2C was able to successfully deliver the 1640 foam below the slab and successfully fill the void and stabilize the slab.
SealBoss’s 1640 is a 4 pound density Cold Foam specially formulated for maximum expansion at ambient temperatures eliminating the need to heat the material or injection lines in many environments. For minimum temperature requirements please consult your SealBoss technician.
The expanding and compressive strength qualities of SealBoss ® 1640 Structural Strength Foam make it a price competitive alternative for the filling of large voids and ‘pockets’. SealBoss ® 1640 Structural Strength Foam can be applied in dry and wet areas. Additional moisture may increase the expansion. The standard mixture expands approximately six times in volume. Job site testing is recommended to determine product suitability.
- For best results with Cold Foam Lift & Under Slab Void Fill
Depending on ambient and substrate conditions foam may need to be temperature conditioned prior to use. Please consult with your SealBoss technician for details.
In addition to the void fill and erosion control application the expansion of the foam achieved a lift of the structure which helped to straighten the bent window frame. Water that was trapped in the windowsill began to run out. We could see the cracks in the masonry visibly shrink as the corner began to lift.
With such a compact and efficient void fill and slab lifting system, we can provide new business opportunities for smaller residential general contractors who want to expand their scope for sidewalk, driveway, patio, pool deck repair.'
