When deck footings are not set deep enough, they become highly susceptible to a process called frost heave. This occurs when moisture in the soil freezes and expands, generating tremendous upward pressure that can have several damaging effects on the structure:
- Structural Misalignment: The frozen ground exerts enough force to lift shallow footings, which can twist support posts out of alignment and cause the deck frame to warp.
- Incremental Movement: As the ground repeatedly freezes and thaws, the footing moves upward in small increments. Over time, this shifting can cause fasteners to shear.
- Safety Risks: The cumulative effect of warping, shearing fasteners, and shifting posts eventually makes the entire deck structure unstable and unsafe.
- Cracking: Specifically for concrete foundations, this upward pressure is strong enough to crack slabs and footings that are not placed below the frost line.
In Nebraska, building codes typically require a minimum footing depth of 42 inches to reach stable soil temperatures and bypass these destructive freeze-thaw cycles.
Related FAQs
-
Can Polyurethane Foam Stabilize a Settling Home without Underpinning?
Read More »: Can Polyurethane Foam Stabilize a Settling Home without Underpinning?Polyurethane foam is generally not recommended for structural foundation stabilization. While it is an effective tool for slab jacking—which involves lifting non-structural concrete like sidewalks, driveways, or interior slabs with less than 2 inches of settlement—it lacks the capacity to…
-
Is Polyurethane Foam Injection a Permanent Solution for Foundation Lifting?
Read More »: Is Polyurethane Foam Injection a Permanent Solution for Foundation Lifting?Polyurethane foam injection is not a permanent solution for structural loads or foundation settlement. While it is an effective tool for non-structural applications, such as filling minor voids or leveling interior slabs, sidewalks, and driveways, it lacks the engineered capacity…
-
Which is Better for Fixing Uneven Concrete Slabs: Foam or Piers?
Read More »: Which is Better for Fixing Uneven Concrete Slabs: Foam or Piers?The choice between polyurethane foam and steel piers depends on whether you are looking for a surface-level lift or a permanent structural solution. While both address settlement, they serve very different purposes: When to choose steel piers: We recommend engineered…
-
Why do some Foundation Experts Recommend Steel Piers over Polyurethane Foam for Structural Issues?
Read More »: Why do some Foundation Experts Recommend Steel Piers over Polyurethane Foam for Structural Issues?We recommend steel piers over polyurethane foam when a permanent, engineered structural solution is required. While polyurethane foam is an effective tool for filling voids and performing minor, non-structural lifts for concrete slabs (typically under 2 inches), it is not…
-
What are the Pros and Cons of Polyurethane Foam Vs. Steel Piering?
Read More »: What are the Pros and Cons of Polyurethane Foam Vs. Steel Piering?When evaluating polyurethane foam vs steel piers, the choice depends on whether you need a temporary surface fix or a permanent structural repair. Polyurethane Foam Injection (Slab Jacking) Steel Piers (Helical or Push Piers) While foam is a suitable tool…