Foundation grade documentation is the record that protects the residential contractor when finished floor elevations are disputed, when framing crews cannot close a floor-to-ceiling dimension, or when a buyer claims the slab is out of level. The documentation must be produced before concrete is placed — after the pour, the data underneath it is gone.
What grade documentation is required for a residential foundation?
Residential foundation grade documentation should include: a benchmark reference tied to a known control point; footing bottom elevation shots at each corner and at 20-foot maximum intervals on long runs, taken before concrete placement; top-of-form elevation verification before the pour; top-of-wall elevation shots after stripping at all corners and at intermediate points; a comparison of actual to design elevations; and a record of any deviation that exceeded tolerance and the corrective action taken. This documentation supports framing authorization, building inspection sign-off, and disputes about finished floor elevation.
Footing bottom elevations must be verified before concrete is placed — they cannot be measured after the pour. The verification establishes that the footing is at the correct depth below finish grade, at the correct absolute elevation for floor-to-ceiling compliance, and at or below the frost depth required by the local building code.
| Measurement Point | Why It Matters | Timing |
|---|---|---|
| Corner footing bottoms | Controls building corner elevations and framing datum | Before concrete, after compaction |
| Intermediate footing shots (20-ft max) | Detects high or low spots that affect slab grade and drainage | Before concrete, after compaction |
| Bearing pad or column footing bottoms | Structural engineers typically require tighter tolerance at point loads | Before concrete, engineer observation may be required |
| Top-of-form elevation | Controls finished slab or top-of-wall elevation | After forming, before pour |
After forms are stripped, shoot top-of-wall elevations at all corners and at 20-foot intervals on long walls. Document results in a table with design elevation, actual elevation, and deviation. The framing contractor uses this data to determine plate heights and identify any walls that need shimming or grinding.
A top-of-wall elevation report that shows actual measurements is more valuable than one that only reports "pass" or "fail." Framing crews can use actual elevation data to adjust — they cannot use a binary conformance statement.
Tolerance Standards by Project Type
| Project Type | Top-of-Wall Tolerance | Authority |
|---|---|---|
| Production residential | ±3/8 inch in 10 feet | NHQA residential standards |
| Custom residential | ±1/4 inch in 10 feet | Project specifications |
| Multi-family (wood frame) | ±3/8 inch in 10 feet | Project specifications, ACI 117 for concrete |
Three instruments are commonly used for residential foundation grade verification:
Regardless of instrument, the documentation must record the instrument type, calibration date, benchmark used, and all measurement points with design and actual elevations. A list of elevations with no context — no benchmark reference, no design comparison — is not a usable record.
The foundation grade package is the record that authorizes framing to begin. It should be assembled before the framing crew mobilizes and should include:
Sitemark captures these measurements in the field and assembles the foundation grade package automatically, ready for the framing contractor and building inspector without manual data entry or spreadsheet formatting.
Sitemark captures footing and wall elevations in the field and generates the grade package your framing crew and building inspector need — before work is covered and disputes become expensive.
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