CONCRETE LIFTING

WITH POLYURETHANE

Krieser uses industrial grade closed-cell polyurethane foam to lift and level sunken planes of concrete, known as polyjacking. Dime sized bore holes are strategically drilled and polyurethane foam is injected through ports. Each hole is patched with concrete and cracks are beveled and sealed with an elastomeric joint sealant as needed.

: Polyjacking visual

: Foam under slab filling cavity

Polyjacking is the top choice concrete lifting method available, engineered specifically for durability and longevity. Polyurethane foam does not corrode, washout, or leach into the soil; it is chemically inert and safe to use.

Our formula is consistent and precise ensuring the highest quality product every time.

Polyurethane foam is a product of two chemicals, when the two are mixed a chemical reaction causes the materials to expand and harden. The foam expands up to 900% filling any voids and then raising the slab. Polyurethane foam will never lose density, is permanent and weighs only 4 pounds per cubic foot. The materials cure in minutes and can be driven over immediately.

Polyjacking vs. Mudjacking

The competitor of polyjacking is mudjacking, or “slabjacking”, has been around since the 1930’s. It is the process of hydraulically pumping a mud slurry, composed of sand and Portland cement, through golf ball sized holes under the slab. It is subject to erosion and the large bore holes increase risk of cracking and are very noticeable. Mudjacking material weighs an average 100 pounds per cubic foot, further compacting the soil, leading to additional sinking.

: Mudjacking, mixing the slurry

: Mudjacking

CRACK BEVELING & CAULKING

Cracks in concrete get worse as time goes on. Water enters cracks and erodes the soil underneath as well as expanding and contracting during freezes, furthering the damage to the concrete.

Krieser uses a specialized crack seeking grinder to bevel out the cracks. The crack is then sealed with a self leveling, elastomeric flexible caulking. The caulking fills the beveled crack, sealing the concrete from further damage.