Mudjacking Versus Polyurethane Foam Injection

Whether its mudjacking, or polyurethane foam injection, both are designed to accomplish the same results, and that is to raise concrete.

Mudjacking uses a grout, which is comprised of a sand-based material, fused with cement. The process requires a large hole, approximately 1 5/8” in diameter, drilled through the slab, which the grout is then pumped under the slab, causing the slab to be lifted. The material for this process weighs approximately 100 lbs per cubic foot.

Problems associated with mudjacking involve:

• Containment of the mess caused by excess mud or grout pumped into the slab to be raised
• Drilling of large holes that can weaken the slab
• The visible evidence of the holes after work is completed
• The grout takes approximately 24 hours to completely cure
  
• The material is effected by moisture
  
• Over a short period of time, the material may crack, break down, weakening in strength
• Requires a large amount of holes to properly raise the concrete, completely filling all the voided areas
• Material is very heavy, which may result in further settlement in a short amount of time

Polyurethane slabjacking uses a two part expanding polymer foam. The process to raise the concrete by foam injection requires a small hole, approximately 5/8” in diameter, drilled through the slab. The polyurethane is then injected under the slab and into the soil, which then expands, filling in all the voided areas, and raises the concrete. The material for this process is very dense, and only weighs approximately 2 lbs per cubic foot.

Benefits from polyurethane foam injection include:

• Seeks out weak soils, and during expansion, creates a strong, more dense, sub-base
• The material will take the path of least resistance, and will fill in all voided areas
• The foam is not weakened by moisture
• Will retain its cured shape and form, reducing the possibility of forming new voids or further settlement
• Completely cures within 15 minutes
  
• Very strong, dense, and lightweight
• Requires much smaller and fewer holes

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