When the soil underneath concrete slabs becomes compromised, it causes the slab to shift out of place and become uneven. This will get worse over time.
A sure and tried way of lifting concrete slabs is with a material called polyurethane foam. This is a light weight, environment friendly, and easy to install solution.
How does it work?
That’s a great question. Instead of having a crew come in to remove the old slab, and pour a new one, we can have a crew lift the concrete slab in less time with less intrusion.
They start by making a dime sized hole in specified areas of the concrete slab(s). Then, after the injection gun is prepared and ready to go, we can start pumping the polyurethane material through the hole, under the slab. Pumping in increments is one of the keys to a successful lifting. Within 10-15 seconds the polyurethane foam will have fully expanded, giving you a good idea of how much more is needed to raise the slab without over raising it.
Because there is heat involved while pumping the polyurethane material, it is important that the heat is dispersed evenly and safely through incremental pumps as opposed to releasing it all at once.
Polyurethane foam not only comes in handy with slab or concrete lifting but can be used for void filling as well. The material usually weighs 15-25 times less than its alternatives like mudjacking or grout mix. The process for void filling is the same process as concrete lifting!
Sometimes slabs lack support and can crack when loads exceeding its capacity are applied. It doesn’t necessarily mean it has settled. This application for polyurethane foam eliminates movement and offers support underneath the slab or concrete. This is especially useful for applications where heavy equipment will be operated like roadways, runways, and warehouses.