History of Polyurethane Foam Concrete Lifting Method
• Development for concrete lifting foam material was started in the 1990’s.
• Polyurethane foam concrete lifting method has been made more available and used more since the late 2000’s.
Polyurethane Foam Concrete Lifting Method Process
• 5/8” holes drilled into the concrete are spaced every 3 to 4 feet in a grid pattern depending how the concrete is sunk. Depending how much the concrete is sunk, 2 rows minimum or more is put into the concrete to properly raise and fill the concrete pad.
• Injection ports are then placed and tightened into the 5/8” holes.
• A 2-part liquid is then injected underneath the concrete, causing a chemical reaction and expands the polyurethane foam material. The foam expands and fills voids in the area being injected, causing the concrete to lift.
• The concrete is raised to original height and voids are filled best as possible. Then the job is cleaned up.
• 5/8” holes are filled and patched with a grout.
Polyurethane Foam Material
• Polyurethane foam is an expanding material.
• Sets quickly and can be fully set within 15 minutes.
• Made from recycled foams.
• Polyurethane foam is a high density engineered material that is designed for residential, commercial, industrial, highway work, and soil stabilization applications.
Polyurethane Foam Concrete Lifting Method Facts
• The spacing and the number of holes put into the concrete are the same as mudjacking.
• 50% to 80% more in cost than mudjacking if done properly and voids filled best as possible, because of material cost and extended labor times.
• Harder to predict material cost when raising concrete with polyurethane foam because of the unknown void filling process.
• Polyurethane foam concrete lifting method on a jobsite can be cleaner than mudjacking while doing the job, which makes it more desirable and suited to use for indoor jobs.
• It provides a good insulation value underneath the concrete when raising concrete with infloor heat.
• There is less control of the concrete because of expanding materials, which makes it more difficult to raise the concrete and fill voids.
• Polyurethane foam set times are fast. This can be a disadvantage while raising the pad because it doesn’t allow the concrete to float. This can cause more stress on the concrete while being raised, and in some cases, original elevation can be harder to accomplish. It can also be harder to tilt and adjust concrete panels to match trip spots.
Polyurethane foam concrete lifting method has its place in the concrete lifting industry. It can be a good solution for raising sunken concrete and solve many problems we have in the peace region and north country. As long as proper procedures are followed to raise the concrete, voids are filled best as possible, and the job is suited for the use of foam. The use should be determined by a professional installer, experienced in raising concrete with ALL methods in the concrete lifting industry.