Sweden - Deep Foamjection™

The home owners did not like the idea of excavating around the home so they chose the non-invasive option of Deep Foamjection™. There were many obstacles in approaching this home’s Deep Foamjection™ project strategy.

1. Per Sweden’s building code, there is 2.5 ft of insulation board directly under the homes flooring. Therefore the injection would need to start that much deeper to address the failing soils.
2. A waterproof membrane was directly under the utility room that could not be punctured, therefore no drilling could be done in the utility room. This room would have to be lifted and stabilized from outside the home and the perimeter of the room (inside the kitchen)
3. The entire home had radiant in floor heating, the local fire department used infrared technology to detect where the heating lines were located. These were indicated with red lines on flooring paper put down throughout the entire home. The blue lines indicated the boiler heat for the home. (Shown in photos to the right) Because of this there were large areas of the home that could not be drilled down into.

The contractor started outside on the most settled corner of the home. All outside pipes were angled to get material underneath the slab and foam board insulation. They installed pipe 6-9 feet, 4 feet below the insulation board. A soil boring report indicated what depth the weak soils were at. A plural component material was injected into the ground. The material expanded into foam that added strength to the soil as it expanded. As more foam was installed pressure was built to lift the slab.

The team lifted in small increments to avoid damage. After they achieved 1 inch lifts, they would move and re-laser the entire home to monitor how much lift was still needed in each area. Approximately 100-150 lbs of foam was pumped at each injection point. Once the outside of the home was stabilized and lifted, they moved inside to finish the injections and stabilize the remainder of the slab.