Section 1907.1 and Why It Still Matters in 2025
Michigan’s 2021 Building Code has not changed in the past four years yet its strict slab‑on‑grade rules continue to dictate every repair we perform. Section 1907.1 demands a minimum 3.5‑inch thickness and adequate reinforcement over questionable soil. When a driveway settles, the slab no longer meets those dimensions so an inspector can treat it like sub‑standard work. Demolishing and re‑pouring restores thickness but costs homeowners more than 15 dollars per square foot and forces them to live without parking for a week. Foam concrete leveling near me fixes the problem at roughly one‑third the price, in a single afternoon and without adding fresh cement that may crack again during its first freeze‑thaw cycle.
How High‑Density Foam Returns Slabs to Code
Polyurethane foam expands to roughly 25 times its liquid volume. When we inject it beneath a sunken patio, it performs three jobs at once: it fills voids in the sub‑base, hydraulically lifts the slab and then cures to a compression strength of about 100 psi. Because it weighs only two pounds per cubic foot it adds almost no load to weak soil. The lifted slab finishes at the elevation the code presumes for drainage, slope and reinforcement coverage. Engineers recognize foam lifting as a “maintenance” activity so we eliminate the need for a building permit on most residential projects. For commercial sites our method satisfies IEBC Chapter 6 alternatives for work in existing buildings, which the Michigan Department of Licensing and Regulatory Affairs accepts for repairs.
A Quick Case Study: Lansing Driveway Re‑leveling
Last August we restored a 620‑square‑foot driveway off Cedar Street that had settled nearly three inches at the garage apron. The slab showed stress cracks and pooled water against the foundation wall. Our crew drilled ten ⅝‑inch ports, injected 110 pounds of HMI 511 foam and monitored lift with laser transits. Total injection time: 96 minutes. By 3 p.m. the homeowner drove two vehicles back into the garage. An inspector from the city’s Building Safety Office confirmed elevation with a straightedge and accepted the repair without further permits because no structural concrete was replaced.
Long‑Term Durability in Mid‑Michigan Freeze Cycles
The 1907.1 thickness rule exists partly to resist frost heave. Polyurethane foam’s closed‑cell structure blocks liquid water so soil under the slab stays drier and freezes less often. Independent tests performed by the Minnesota Department of Transportation found no measurable foam deflection after 10,000 freeze‑thaw cycles, which exceeds a typical Mid‑Michigan lifespan by two decades. Because lifted slabs maintain proper pitch, meltwater drains away instead of refreezing in cracks, extending service life even further.
Environmental and Regulatory Benefits
Michigan’s Part 91 Soil Erosion law exempts maintenance that disturbs less than one acre and keeps earth changes more than 500 feet from surface water. Foam lifting easily qualifies, which means no soil‑erosion permit, no silt fence and no additional inspection fees. The product we use is a two‑component MDI‑based resin with blowing agents that comply with the EPA’s 2025 hydrofluorocarbon phase‑down schedule. Demolishing concrete, by contrast, creates about 20 pounds of CO₂ per cubic foot during cement manufacture according to the National Ready Mixed Concrete Association. Lifting therefore delivers a carbon footprint about 90 percent lower than replacement.
Frequently Asked Questions
Will the foam wash out? No. After cure it becomes water‑insoluble.
Can you lift stamped or decorative surfaces? Yes. Our small ports allow discreet patches that blend into patterns better than large mudjacking holes.
How long before I can drive on it? Normally one hour.
Does homeowners insurance cover lifting? Some policies do. We provide photos and invoices that customers submit for reimbursement.
For additional details read our step‑by‑step guide on how concrete levelling works and check pricing on our Concrete Lifting & Leveling page. Curious how other regions handle sunken slabs? See this helpful Angi article on mudjacking and foam costs.
Need concrete leveling near me? Call our Morrice office or request a free on‑site quote online today. We serve Lansing, Owosso, Fenton, Howell, Flint and every rural township in between.
