Mudjacking vs Foam Jacking
If you’re dealing with a sunken or uneven concrete slab, you know you need a solution. Understanding the mudjacking vs foam jacking debate is key to choosing the right one. While both methods lift concrete, they are not created equal. This guide will break down the key differences in cost, durability, and process, helping you make an informed decision to protect your property investment.
What is Mudjacking?
Mudjacking is a traditional method for raising sunken concrete. The process involves pumping a slurry mixture of sand, cement, and water beneath a concrete slab to lift it back to its original level. While it has been used for decades, it is an antiquated system, and the results are typically not as long-lasting as modern foam jacking.
Advantages of Mudjacking
While foam jacking is superior in most cases, mudjacking has a few specific benefits and use cases.
#1 Mud is Cheap – It Can Be Less Expensive Upfront
Due to lower material costs, mudjacking can be about 20% less expensive than foam jacking on average. However, this initial saving may not translate to long-term value as the material is prone to future settlement and additional repairs.
#2 Mud is A Traditional Method – Proven for Certain Applications
Mudjacking has been a functional method for raising concrete for many decades. It can be effective for certain applications, particularly for smaller, simple concrete slabs where the heavy weight of the material is less of a concern.
#3 Mud Can Be Used as a Base – A Cost-Effective Void Filler
For slabs that have sunk significantly, a two-stage lift can be the most economical approach. This strategy uses mudjacking as a strategic first step to save on material costs.
- Step 1: Bulk Filling with Slurry: First, the low-cost mudjacking slurry is used to fill the majority of the deep void under the concrete.
- Step 2: Precision Lifting with Foam: Once a new sub-base is established and has cured, you can use polyurethane foam for the final, crucial lift. This ensures the surface is perfectly leveled and sealed with a permanent, waterproof material.
The Disadvantages of Mudjacking
While mudjacking is a traditional method, it comes with significant drawbacks in terms of material, appearance, process, and long-term durability.
#1 Mud is Extremely Heavy – Adds Stress to Unstable Soil
The slurry mixture used in mudjacking is incredibly heavy, weighing around 100 lbs per cubic foot compared to just 2-4 lbs for polyurethane foam. This added weight can put further stress on already unstable or weak soils, increasing the risk of the slab settling again in the future.
#2 Mud is More Invasive – Requires Larger & More Holes
Mudjacking requires drilling significantly larger and more numerous holes (typically 1 & 5/8 inches in diameter-the size of a small pop can) into your concrete. This not only makes the repair much more noticeable and less aesthetically pleasing but also means that if a re-pump is ever needed, entirely new holes must be drilled.
#3 Mud Takes a Long Time to Cure – Significant Downtime
The cement-based slurry needs a long time to cure and harden. You must wait an average of 1-3 days before you can use the repaired area again. This downtime can be a major inconvenience for driveways, patios, and commercial spaces.
#4 Mud Doesn’t Last – Prone to Washouts & Future Settling
The materials in mudjacking slurry can be eroded and washed away over time by groundwater or even burrowing critters. The material can also shrink as it dries, creating new voids beneath the slab. This leads to a shorter lifespan and is why mudjacking repairs typically only come with a warranty of up to 3 years.
Compare this to the 10-year warranty we offer for foam jacking services, a solution designed to be permanent.
What is Foam Jacking?
Foam jacking, also known as polyjacking or polyurethane concrete lifting, is an advanced method for raising and stabilizing sunken concrete slabs. The process begins by strategically drilling small, 5/8-inch holes into the affected area. A high-density, two-part polyurethane foam is then injected as a liquid, expanding in a slow and controlled fashion to fill any air spaces or voids beneath the slab and gently lift it. This material hardens in just 15 minutes upon injection, providing a strong, stable foundation that is immediately ready to be used.
Downsides to Foam Jacking
#1 Foam Is More Expensive – You’re Paying For a Superior Material
Foam jacking is generally more expensive than mudjacking due to the cost of materials and the specialized equipment required. This can make it a less attractive option for budget-conscious projects.
Read our post about Polyurethane Concrete Lifting Costs and the factors that affect pricing so that you can make an educated decision when choosing a concrete lifting contractor.
#2 Foam Can Degrade Due to UV Exposure – Proper Maintenance is Key
The polyurethane foam used for raising concrete can degrade if exposed to ultraviolet (UV) rays. It’s crucial to ensure the foam is not exposed to sunlight post-lift, as UV exposure can deteriorate the foam and reduce its lifespan. With proper post-lift maintenance, this is nothing to worry about.
Read our Essential Guide to Care for Lifted Concrete to learn more about proper maintenance for your concrete lifting repair and get the longest life out it.
#3 Foam Jacking Is Less Available – Less Populated Areas Might Not Have Access
Foam jacking services may not be available in all regions, especially in rural or less populated areas, making it harder for some property owners to access this method of concrete lifting.
If you’re located in Manitoba or Northwestern Ontario, you can view our Service Areas Page to confirm we serve your location. If you are located anywhere else, across North America and are looking for a reputable foam jacking contractor, please reach out to us via email and we will review our network of polyurethane slab jacking contractors to see if anyone might serve your area.
Why Foam Jacking Is Better than Mudjacking
Foam jacking is the modern standard for concrete repair, offering significant advantages in performance, appearance, and long-term value compared to older methods.
#1 Foam is Light, Yet Strong – Prevents Future Settlement
The polyurethane foam is incredibly strong yet weighs only 2-4 lbs per cubic foot, compared to over 100 lbs for mudjacking slurry. This prevents new stress from being added to already unstable soil, reducing the risk of future settlement.
Our exclusive foam has an impressive compressive strength that can support up to 25,000 lbs per square foot, making it ideal for driveways, garage floors, and other high-load areas.
#2 Foam Requires Fewer & Smaller Holes – Looks Better & Cleaner
Foam jacking requires drilling fewer holes that are only 5/8 inch in diameter (about the size of a dime). This results in a cleaner, more aesthetically pleasing finish where patches are far less noticeable.
#3 Foam Can Reach Almost Any Area With Ease – Won’t Damage Your Lawn
The equipment is attached to a long hose that can extend hundreds of feet, allowing our team to access difficult-to-reach areas without bringing heavy machinery onto your property.
#4 Foam Repels Water – Longer Lasting Repair & Warranty
Polyurethane concrete raising foam is hydrophobic, meaning it repels water instead of absorbing it. Unlike mudjacking slurry, which can erode over time, our foam will not sag, wash away, or shrink, even in wet conditions. This permanent, water-resistant bond to the concrete provides a much longer-lasting repair, and we are so confident in its durability that we back our work with an industry-leading 10-year warranty.
#5 Foam Cures Extremely Fast – Almost No Downtime
The foam fully hardens and is ready for use just 15 minutes after injection. This allows for immediate use once the job is done and holes are patched, perfect for busy homeowners and businesses that need to continue operations.
#6 Foam Strengthens & Stabilizes Your Concrete – Improves Safety & Durability
The stable, permanent support provided by our polyurethane foam drastically reduces the incidence of new surface hairline cracks. More importantly, by stabilizing the slab correctly, the process eliminates dangerous trip hazards from forming at existing gaps and cracks, making your property safer for your family and guests.
FAQs About Mudjacking vs Foam Jacking
What is mudjacking?
Mudjacking is an older method of concrete lifting that involves pumping a heavy, cement-based mud slurry under the slab to raise it.
Is foam lifting better than mud jacking?
Polyurethane concrete lifting is generally better than mudjacking because it's lighter, more durable, and water-resistant. It requires fewer and smaller drill holes, cures within minutes, and won’t erode or shrink over time. While mudjacking is sometimes cheaper upfront, foam provides a longer-lasting, more stable solution with minimal disruption.
Will foam jacking lift my concrete evenly?
Polyurethane foam is injected beneath the settled concrete, where it expands to fill voids and gently raises the slab back to its original position. This process is controlled and precise, ensuring an even lift without additional stress on the foundation.
Does polyurethane shrink over time?
Unlike mudjacking slurry, polyurethane concrete lifting foam remains rigid and stable once cured. It is water-resistant, meaning it won’t erode from moisture exposure. However, prolonged UV ray exposure can cause the foam to lose it's hydrophobic properties, so proper drainage and protection from UV rays is crucial.
How much does mudjacking cost compared to foam?
Due to lower material costs, mudjacking can be about 20% less expensive than foam jacking on average. However, this initial saving may not translate to long-term value, as the material is prone to future settlement causing additional repairs.
What is the life expectancy of mudjacking?
The life expectancy of a mudjacking repair is between 2-10 years, although the average is 3 years.
What are the disadvantages of mudjacking?
The primary disadvantages of mudjacking are its heavy material and invasive process. The cement-based slurry is extremely heavy, which can add more stress to unstable soil and cause the slab to settle again. The process also requires drilling numerous large holes (over 1.5 inches) that leave more noticeable patches. Finally, the repair is often not permanent as the material can shrink or wash away over time, and it requires a long curing period of 1-3 days before the area can be used again.
Which is better, mud jacking or foam?
Polyurethane foam, used in foam jacking, provides a modern alternative to traditional mudjacking. It is more efficient and less invasive, making it a preferred choice for many property owners.