Concrete Leveling With Spray Foam - Foam All Spray Insulation (2024)

FAQs

Can you use spray foam to level concrete? ›

In conclusion, leveling your concrete floor with spray foam insulation is a cost-effective and efficient way to solve an uneven floor problem. It requires careful preparation and the right equipment, but the results are worth it.

Concrete is a very heavy material, and if the soil underneath your slab is not strong enough to support the weight, it will just sink into the ground. Injecting concrete leveling foam underneath your sunken slab will lift up your concrete, giving it a stronger foundation to rest on.

Spray foam insulation is an effective method of retaining heat, coolness, and even adding reinforcement. It's also an ideal solution for protection from the elements, stabilization, pest control, and weatherproofing.

Yes it sticks to concrete! Spray foam typically expands too, but on cold concrete it won't expand a lot because it's cold. Professional installers will quickly overspray concrete just to put a initial skim layer on the concrete, then come back k a few minutes later and layer it up to the desired thickness.

The easiest way is to use a self-leveling compound, also called liquid floor underlayment or floor resurfacer, within sections of level-cut rails. The material flows out like thick syrup, then hardens into a smooth, perfectly level surface, sometimes in less than an hour.

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. Once voids are filled, the foam begins to lift the sunken concrete.

Generally, foam jacking can last up to 10 to 20 years or more before the concrete slab needs to be lifted again. This is because the foam material used in foam jacking is designed to be long-lasting and resistant to degradation and compression.

Less Control and Over-Lifting

Foam's chemical reactions are also highly sensitive to temperature and pressure, and the pressure of the confined space under the slab can lead to inconsistent expansion. These factors reduce control and make it easier to overdo the repair and lift the slab too far out of place.

Is 2 inches of spray foam enough? ›

Now generically speaking, we usually recommend open cell spray foam to be 6- to 10-inches on a roof deck or ceiling and 3-inches in the walls. Closed cell spray foam should be 4- to 5- inches on the ceiling and 2- to 3-inches in the walls.

Don't use expanding foam around electrical boxes

Secondly, expanding foam is very flammable and as a result, placing it near an electrical box is hazardous and could increase the fire risk.

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.

It Is Cost-Effective

Expanding spray foam is also a cost-effective way to level out an uneven concrete slab.

Foam Injection: A polyurethane foam mixture is injected through the drilled holes. As the foam expands, it fills voids and lifts the concrete to its desired level. Patching: Once the concrete is leveled, the drilled holes are patched and the surface is cleaned.

Using foam concrete leveling on a small patio (100 to 150 square feet) that needs less than a 2-inch lift might cost approximately $1,215. For a larger patio (~350 square feet or more) with significant voids underneath or that requires substantial lifting, the polyjacking cost could reach around $4,725.