How much does it cost to jack up a sunken concrete slab in Moncton?

Concrete slab lifting (mudjacking or polyurethane foam injection) in Moncton typically costs $500-$2,500 depending on the size of the sunken area, the method used, and how many injection points are required -- significantly less than slab replacement, which runs $10-$18 per square foot.

Sunken concrete slabs are common throughout Moncton, Dieppe, and Riverview due to our Maritime soil conditions. The clay-heavy soils in much of Greater Moncton are prone to settling and compaction under concrete slabs, particularly in areas that were previously poorly compacted fill or where tree roots have decayed and left voids. NB's freeze-thaw cycles also contribute -- water under the slab freezes, raises the slab, thaws, and the soil settles, leaving a void beneath.

Two main methods are used in the Moncton area:

Mudjacking (slabjacking): A slurry mixture of water, cement, and soil is pumped under the slab through drilled holes (1.5-2 inches in diameter) to fill voids and lift the slab. Mudjacking has been used for decades and is effective for large areas. The slurry adds significant weight and is slower to cure than foam. Cost in Moncton: $3-$6 per square foot, with minimum charges of $300-$500. A typical sunken driveway section of 100 square feet runs $300-$600.

Polyurethane foam injection (poly levelling): Expanding two-part polyurethane foam is injected through smaller holes (5/8 inch diameter). The foam expands rapidly, fills voids, and lifts the slab within minutes. Poly levelling is more precise than mudjacking, adds minimal weight, and cures in 15-30 minutes. It is preferred for settled garage floors, front steps, pool decks, and areas where minimal hole size matters aesthetically. Cost in Moncton: $5-$10 per square foot. A 100 square foot settled section runs $500-$1,000.

Factors that affect cost:

• Number of injection points: Each hole drilled is a cost centre. More severe settlement or larger voids require more injections


• Slab thickness: Thicker slabs require more pressure and material to lift


• Access: Tight access between garage walls, steps, or landscaping adds time


• Amount of lift needed: A slab that has settled 2 inches costs more to lift than one that settled 1/2 inch

When lifting is not the right choice: if the slab itself is badly cracked, spalling, or structurally compromised, lifting it may not produce a worthwhile result. A concrete professional can assess whether lifting, resurfacing, or full replacement is the best value. New Brunswick Concrete can match you with Moncton-area concrete specialists who offer slab lifting and levelling services for a free estimate.