Concrete footings are the difference between a house that stands for a century and one that settles, cracks, and costs you five figures in repairs. Inspecting footing work before the concrete sets or before you sign off on a completed job requires knowing exactly what to check, when to check it, and what measurements actually matter. This guide walks you through the critical inspection steps that protect your investment.
Why Footing Inspection Matters
Your footings bear the entire structural load of the building. Poor depth, inadequate compaction, wrong concrete mix, or improper reinforcement placement can trigger foundation failure within years. A foundation repair job—underpinning, piering, or replacement—typically runs $15,000 to $50,000+, making upfront inspection the cheapest insurance you'll buy.
Most footing problems are cheapest to fix before concrete is poured. Once cured, you're looking at demolition and reconstruction. That's why inspecting before the concrete truck arrives is non-negotiable.
Check the Excavation and Soil Preparation
Before any concrete goes down, verify that the hole is dug to the correct depth. Local frost lines vary—in northern climates, footings must reach 3–4 feet below grade; in warm regions, 12–24 inches is sometimes acceptable. Check your local building code or ask your concrete contractor what depth applies to your project.
Inspect the soil at the bottom of the excavation. It should be:
- Undisturbed native soil (not backfill or loose material)
- Properly compacted (the contractor should have tamped it; don't rely on guesswork)
- Free of debris, organic matter, and topsoil (these compress over time and cause settling)
- Dry or at proper moisture level (excessively wet soil loses bearing capacity)
Push a screwdriver or probe into the bottom—it should meet firm resistance, not slide in easily. If the soil feels spongy or wet, ask the contractor to allow time for drainage or bring in fill material rated for bearing.
Verify Footing Dimensions and Placement
Footings must match the structural design. A typical single-story house footing is 12–18 inches wide and 12 inches deep; multi-story buildings require wider, deeper footings. Your plans should specify exact dimensions.
Measure the footing trench width at multiple points (every 4–6 feet) and check depth with a level and measuring tape. Variations of more than 1 inch are red flags—they suggest careless excavation or inconsistent soil conditions that the contractor hasn't addressed.
Also confirm footing placement relative to the structure. Footings should center under walls. Offset footings distribute load unevenly and can cause cracking.
Inspect Reinforcement Before Concrete Pours
Steel rebar or wire mesh placement is critical and invisible once concrete cures. Before the concrete truck arrives:
- Count and verify rebar size and spacing. Most residential footings use #4 or #5 rebar spaced 12–16 inches apart, either one or two layers depending on load.
- Check concrete cover. Rebar should be 2–3 inches from the bottom of the footing (this protects steel from corrosion and ensures it bonds properly with concrete).
- Confirm rebar is tied, not just laid. Rebar should be secured so it won't shift when concrete is poured.
- Look for rust, oil, or debris on rebar. These reduce bond strength between steel and concrete.
If reinforcement is missing, undersized, or poorly placed, ask the contractor to halt the pour and correct it.
Monitor the Concrete Pour and Finishing
Concrete quality depends on mix design, delivery temperature, and placement technique. Standard concrete for footings should be 4,000 psi strength, ordered for the weather conditions on pour day.
During the pour:
- Observe workability. Concrete should flow into corners without excessive vibration but shouldn't be soupy or runny (that's too wet and loses strength).
- Watch for voids. Use a vibrator to consolidate concrete and eliminate air pockets, especially around rebar.
- Check finish grade. The top surface should be level and even, sloping slightly (1/4 inch per foot) away from the structure for drainage if required.
Final Documentation
Once concrete cures (7–14 days depending on conditions), do a final walk-through. Look for cracks wider than 1/8 inch, soft spots, or spalling (surface deterioration). Take photos and request written sign-off from the contractor.
If you're comparing concrete footing contractors, Mercoly lets you review provider profiles, read past projects, and compare bids from trusted specialists in Concrete Foundations & Footings in your area.
Frequently Asked Questions
Q: How long should I wait before building on poured footings? Standard concrete reaches 90% strength in 7 days and full strength in 28 days, but most contractors recommend waiting at least 7 days before heavy construction loads.
Q: What's the typical cost per linear foot for concrete footings? Residential footings usually run $8–$15 per linear foot depending on depth, width, rebar requirements, and local labor rates; get 2–3 quotes to compare.
Q: Can I use old concrete rubble or recycled material as footing fill? No—footings require undisturbed native soil or engineered fill; recycled concrete can settle and compress unevenly, compromising foundation stability.
Ready to get your footing work inspected by qualified professionals? Find and compare trusted Concrete Foundations & Footings providers in your area today.