There are 3 options to raise your sunken concrete slabs:
- CONCRETE/CEMENT slurry (concrete raising the CRC way)
- POLYURETHANE foam (referred to as poly-jacking)
Concrete has been used for thousands of years in the construction industry. It is known and proven to be an inert material providing structural hardness and durability for years. No chemical materials are used during the mixing and preparation process.
Flowable cement slurry (concrete) is pumped down vertically to raise the sunken concrete, filling the void beneath the concrete slabs. This slurry mixture solidifies to form a solid material, with properties that are similar to poured concrete, therefore, providing resistance and strength to the existing concrete.
To raise concrete with the Poly Foam, providers have to make a chemical reaction of two component parts, commonly referred to as Side A and Side B. This happens in your yard underneath the concrete in direct contact with the soil. You can learn more about Spray Polyurethane on the EPA website:
Health Concerns about Spray Polyurethane Foam
One of the compounds is Isocyanate, and it is classified as a potential human carcinogen.
Isocyanates are known to cause cancer in animals and are listed as Toxic Substances by the EPA and OSHA. https://www.osha.gov/SLTC/isocyanates/
Read more about Poly-Jacking:
- The day the work was completed a chemical fire developed in the foam. Chicago-based meat producer has filed lawsuit against construction companies. https://everchem.com/concrete-jacking-foam-fire-lawsuit/
- A chemical incident shut down blocks of downtown Vancouver. https://www.cbc.ca/news/canada/british-columbia/10-lawsuits-filed-over-2010-vancouver-chemical-fire-1.1167017
- Facts about Polyurethane Foam www.apgma.com/polyurethane.htm
This leads one to ask: What impact does this process have on the soil? What side products (and side effects) could be formed when the highly reactive materials are exposed to the soil compound?
"Mud-Jacking", as the name implies, utilizes a mixture of topsoil and water (mud) which is hydraulically pumped into a hole drilled in a slab of sunken concrete. Some “mud-jackers” follow a similar process but instead use crushed limestone or other materials. These mixes will shrink as water and moisture evaporate or dissipate into the soil.
Without the bonding agent, cement, erosion would occur quicker over time. Therefore, mud-jacking is a very temporary repair. Caution: Some mud-jackers throw a minimal amount of cement in their mixture and call the process “concrete raising like CRC.”
Buyer Beware! Their process is NOT the calibrated and automated way of concrete raising that we stand behind.
CRC CONCRETE RAISING & REPAIR PROVIDES THE LONGEST LASTING CONCRETE RAISING RESULTS AND THE BEST WARRANTY IN THE INDUSTRY.
Our state-of-the-art equipment, including our volumetric mixer, produces consistent, calibrated cement-based slurry (concrete) that is impervious to water and is, therefore, the most permanent fix for the settled concrete. Our process and materials are safe, environmentally friendly, and our results meet the industry quality standards for pitch and grade.
Our concrete raising crews have developed into the best in our market under the leadership of experienced and hard-working crew chiefs. All of this allows us to do what we do best QUALITY work with long lasting results! Yes, it would be easier and cost
SLAB-RAISING COMPARISON CHART