This expanding foam can lift 6,000 pounds of concrete per square foot (2024)

FAQs

What is the best expanding foam to lift concrete? ›

Common concrete problems like sinking and settling concrete can be fixed with polyurethane foam. Polyurethane foam is great for leveling concrete. As the foam is injected under the concrete, it moves and expands. As the foam expands it fills any holes, cracks, and crevices beneath the concrete slab.

For slab lifting: Because the foam is confined when lifting a slab, the expansion rate will be affected. What we have observed in our many years of experience is that usually a half a pound of polyurethane will lift one square foot ½”. That's less than ½ a pint of material.

Cost-Effective Alternative to Replacement

Like all concrete leveling methods, polyurethane foam concrete leveling can save quite a bit of money off the cost of replacement. This is because concrete lifting requires far less time, labor, and materials than completely replacing the concrete.

Polyurethane lifting foams create an abundant amount of lifting power to raise settled concrete. They provide enough strength to support a slab enduring just about any load.

In FriendnFamily's video, they simply drill holes in the concrete, then put the nozzle into the holes and inject the foam under the slab. It slowly lifts, although it does not become perfectly even with the neighboring slab. Notice how it lifts both the sunken and raised slab at the same time.

A good concrete leveling repair can last the lifetime of the concrete itself, which could be 20 to 50+ years. This is true for stone slurry grout leveling, polyjacking (foam concrete leveling), and mudjacking – all concrete leveling methods can last for decades, right alongside your concrete.

Here's how it works. Small dime-sized holes are drilled into your concrete slab. The expanding foam is injected into the holes. (If you have a sidewalk, experts can use a jack to lift your concrete and then inject the foam from the side.)

Expanding foam and concrete are promising options for post-hole fillers. Concrete is more durable and can support load-bearing posts. Expanding foam works best for lightweight vinyl or mesh fences. Concrete takes longer to set and cure.

Many people have also tried lifting their concrete using expanding foam from cans, like Great Stuff Gaps and Cracks. Foam concrete leveling is a method professionals use to lift settled slabs, but the DIY version isn't recommended.

How Long Does Polyjacking Last? Foam concrete lifting can last for the lifetime of the concrete itself, which can be 20 to 50+ years. But whether or not it lasts this long depends on whether it was done correctly in the first place and regularly maintained after the fact (more on this in the next sections).

What are the disadvantages of foam concrete? ›

Foamed concrete has advantages such as being light in self-weight, excellent thermal insulation properties, environmental safeguards, good fire resistance performance, and low cost. However, it also has disadvantages such as low strength, a large amount of entrained air, poor toughness, and being a brittle material.

Polyurethane concrete raising leads to a longer-lasting and quicker repair, and it is a more precise operation than mudjacking.

The preparation method for the foam concrete comprises the following steps: (1) uniformly mixing cement, fly ash and a filler, adding water, and stirring the mixture to obtain cement mortar; (2) adding aluminum powder, a suspending agent and an admixture into the cement mortar, and uniformly mixing with stirring to ...

Foam concrete lifting costs $5 to $25 per square foot, according to various sources across the web.

Polyurethane concrete lifting foam is much lighter (2 lbs per cubic foot) than a mudjacking slurry (100 lbs per cubic foot), which makes much more sense to use on already unstable soils.