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newSchoolWorks.com › VoTechWorks › Building & Construction › Masonry › Footings: Layout, Excavation, and Masonry Foundation Construction › Lesson 7
BLD-MASO04-06 · Lesson 7 · 8 clock hours · field

Footing Inspection, Stripping, and Quality Documentation

Objective. Students will strip cured footing forms, perform a dimensional and visual quality inspection of the finished footing, identify any defects with their likely cause, and complete a written quality-control inspection record.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a licensed professional engineer or master tradesperson or by a certification or approval body. It is a study draft and may contain errors. Do not use it as instructions for work on a job site or on live equipment. Always follow your instructor, your supervising professional, and current official references and regulations.

VoTechWorks program approval and accreditation are still in progress. Credentials are issued only by the certifying bodies named in each program, after their own exams.

Why Inspection and Documentation Matter

Stripping forms and walking away is not the end of footing work — it is the beginning of accountability. A footing that is out of tolerance, honeycombed, or cracked can compromise every course of masonry built on top of it. Quality-control inspection, done systematically and recorded in writing, protects the structure, the owner, and your crew. It also produces the paper trail that contractors, inspectors, and project managers rely on throughout the life of a building.

When Can Forms Come Off?

Concrete gains strength through a chemical process called hydration, not simply by drying. Footings must reach adequate strength before formwork is stripped. In standard conditions (roughly 50–90 °F air temperature), residential and light-commercial footing forms are typically left in place a minimum of 24–48 hours after the final pour. Cold weather slows hydration significantly; hot, dry weather accelerates surface drying but can actually weaken concrete if moisture escapes too fast. Always follow the project specification or the licensed designer's instructions for cure time. Never strip early to save time — early stripping can cause corner spalling, cracking, or dimensional distortion.

Safe Form-Stripping Technique

Before touching any form board, conduct a pre-task safety check:

Dimensional Inspection

Once forms are off, measure the finished footing at three points: near each end and at the center. Record each measurement on the inspection record form before moving on. Measure:

1. Width — compare against the design drawing dimension.

2. Depth (thickness) — probe with a tape into the excavation at the side or use a depth rod if the bottom is accessible.

3. Top-of-footing elevation — use a digital level referenced to a known benchmark or the established grade stake. Compare the measured elevation to the design elevation and record the deviation.

Deviations outside the project tolerance (commonly ±3/8 inch for residential footings, though always defer to the project spec) must be flagged on the inspection record — circled, noted, and brought to the supervisor's attention before the next course is laid.

Visual Inspection and Common Defects

After dimensions are recorded, walk the entire length of the footing and examine all exposed surfaces. Look for:

Honeycombing — a rough, porous, void-filled surface caused by concrete failing to fully surround the aggregate. The most common cause is inadequate internal vibration during placement, or a mix that was too stiff. Minor surface honeycombing may be cosmetic, but any honeycombing that exposes reinforcing steel always requires evaluation by a qualified person (engineer or project supervisor) before repair or continuation of work. This is a fundamental ACI field principle. Do not patch and proceed without that sign-off.

Cold joints — a visible seam or plane of weakness where a fresh concrete pour met concrete that had already begun to set. Caused by delays between pours or by placing concrete on a partially hardened lift without proper bonding. A cold joint can be a structural concern depending on its location and orientation.

Surface cracking — hairline cracks from rapid moisture loss (plastic shrinkage) are common in hot or windy conditions and are often cosmetic. Wider cracks, or cracks that run through the full depth, require engineering evaluation.

Rebar exposure — reinforcement visible at the surface has insufficient cover, which leads to corrosion over time. This is always flagged and evaluated; it is never acceptable to leave exposed rebar unaddressed.

Photograph every defect with a tablet or camera, annotate the image with the defect type and location (e.g., "NE corner, 8 in. from end"), and attach the photos to the inspection record.

Completing the Inspection Record

A quality-control inspection record is a legal and professional document. Every entry must be:

If a defect is found, note the probable cause, whether you assess it as cosmetic or structural, the recommended remedy, and whether a qualified person's evaluation is required before work continues. Your instructor reviews the completed record as the primary check for this lesson.

Summary

Stripping, inspecting, and documenting a footing closes the loop on foundation work. Safe stripping technique protects both the concrete and the crew. Systematic three-point dimensional checks catch tolerance violations before they become costly problems. Recognizing defects — and knowing which ones stop work until an engineer or supervisor signs off — is the mark of a professional mason.

Key terms9

HoneycombingA defect in hardened concrete where voids remain because the mortar or paste did not fully surround the coarse aggregate, often caused by inadequate vibration or a too-stiff mix.
Cold jointA plane of weakness in concrete formed when fresh concrete is placed against concrete that has already begun to set, preventing full bonding between the two lifts.
Form strippingThe process of removing formwork from cured concrete; must be done only after adequate cure time and without striking the concrete surface directly with pry bars.
Cure periodThe time allowed after a concrete pour for hydration to progress and the concrete to gain sufficient strength before formwork is removed or loads are applied.
Top-of-footing elevationThe measured height of the finished top surface of a footing relative to a known benchmark or grade reference, compared against the design elevation to check conformance.
Inspection recordA written quality-control document that records all dimensional measurements, observed defects, probable causes, remedies, and the signature of the person who performed the inspection.
Rebar exposureA condition in which reinforcing steel is visible at or near the concrete surface due to insufficient cover, creating a corrosion risk and requiring evaluation before work continues.
Plastic shrinkage crackA surface crack that forms in fresh or recently placed concrete when moisture evaporates from the surface faster than bleed water can rise, often occurring in hot or windy conditions.
Dimensional toleranceThe allowable variation between a measured dimension and the design dimension; deviations outside tolerance must be flagged on the inspection record and reviewed before proceeding.

Worked examples4

1. You measure the footing width at three stations and get 11 7/8 in., 12 1/8 in., and 12 in. The design calls for 12 in. wide with a tolerance of ±3/8 in. Which readings, if any, must be flagged?
  1. State the design dimension and tolerance: 12 in. ± 3/8 in., so acceptable range is 11 5/8 in. to 12 3/8 in.
  2. Check Station 1: 11 7/8 in. = 11.875 in. Lower limit = 11 5/8 in. = 11.625 in. Since 11.875 > 11.625, Station 1 is within tolerance.
  3. Check Station 2: 12 1/8 in. = 12.125 in. Upper limit = 12 3/8 in. = 12.375 in. Since 12.125 < 12.375, Station 2 is within tolerance.
  4. Check Station 3: 12 in. = 12.000 in. Exactly at design dimension, well within tolerance.
  5. Record all three measurements on the inspection form; mark the deviation column for each. No flags are required because all readings fall within the ±3/8 in. tolerance band.
Answer: No measurements require flagging; all three stations fall within the acceptable range of 11 5/8 in. to 12 3/8 in.
2. The design top-of-footing elevation is 98.50 ft above a benchmark. You measure elevations of 98.46 ft, 98.53 ft, and 98.41 ft at the three stations. The allowable tolerance is ±3/8 in. (±0.031 ft). Which stations must be flagged?
  1. Convert tolerance to decimal feet: 3/8 in. ÷ 12 = 0.03125 ft ≈ 0.031 ft. Acceptable range: 98.469 ft to 98.531 ft.
  2. Station 1: 98.46 ft. Lower limit is 98.469 ft. Since 98.46 < 98.469, Station 1 is 0.009 ft low — outside tolerance. FLAG.
  3. Station 2: 98.53 ft. Upper limit is 98.531 ft. Since 98.53 < 98.531, Station 2 is within tolerance.
  4. Station 3: 98.41 ft. Lower limit is 98.469 ft. Since 98.41 < 98.469, Station 3 is 0.059 ft low — outside tolerance. FLAG.
  5. Record all measurements; circle and annotate Stations 1 and 3 as out-of-tolerance low and bring to supervisor before laying masonry.
Answer: Stations 1 and 3 must be flagged as out-of-tolerance (both below the acceptable lower limit of 98.469 ft). Station 2 is acceptable.
3. You are filling out the inspection record defect section. You observe honeycombing 4 inches long on the face of a footing near the end. When you probe it, you can see a horizontal rebar. What do you record for (a) probable cause, (b) cosmetic or structural concern, and (c) next step?
  1. Identify the defect: honeycombing with exposed reinforcing steel.
  2. Probable cause: Insufficient internal vibration during concrete placement (or mix was too stiff), preventing paste from fully encasing the aggregate around the rebar.
  3. Cosmetic or structural: Exposed rebar means this is NOT a cosmetic defect. Per ACI field guidance, any honeycombing that exposes reinforcement always requires evaluation by a qualified person.
  4. Next step: Do NOT patch and proceed. Photograph and annotate the defect, record it on the inspection form with your assessment, and halt work on that section until a qualified person (engineer or project supervisor) has evaluated and authorized a repair method.
Answer: (a) Probable cause: inadequate vibration. (b) Structural concern requiring evaluation — not cosmetic. (c) Stop work on that section; notify supervisor or engineer before any patching or continuation.
4. A footing section is 18 ft long. You must record measurements at three evenly spaced stations. Where (in feet from the starting end) is each station located?
  1. Three stations divide the footing into sections. Place stations near each end and at the center for representative coverage.
  2. Station 1: approximately 1–2 ft from the starting end — use 1.5 ft as a practical near-end point.
  3. Station 2: midpoint = 18 ÷ 2 = 9.0 ft from the starting end.
  4. Station 3: approximately 1–2 ft from the far end — use 16.5 ft (i.e., 18 − 1.5 ft) from the starting end.
  5. Record these three locations on the inspection form so measurements are reproducible and traceable.
Answer: Station 1 at ~1.5 ft, Station 2 at 9.0 ft, Station 3 at ~16.5 ft from the starting end.
In class: After the required cure period, student teams strip forms by removing stakes and kicker boards, then clean and stack lumber for reuse — instructor evaluates safe form-stripping technique (no pry-bar strikes against concrete, lumber stacked flat). · Each student independently measures the finished footing (width, depth, top-of-footing elevation versus design elevation) at three points and records measurements on an inspection record form; visible defects (honeycombing, cold joints, rebar exposure) are photographed with a tablet and annotated. · Defect cause-and-remedy exercise: instructor reveals two pre-seeded defects in a demonstration footing section (honeycombing from insufficient vibration, a surface crack from rapid drying); students write the probable cause, the prevention measure, and whether each defect requires structural repair or is cosmetic, referencing the ACI field guide principle that honeycombing exposing reinforcement always requires evaluation by a qualified person.
Materials: Cured footing sections from Lesson 6; pry bars (wedge type only); lumber stacking area; tape measure; digital level; tablet or camera for documentation; inspection record forms; ACI field reference card on concrete defects; personal protective equipment (hard hat, safety glasses, gloves)
Check: Completed inspection record reviewed by instructor; all three measurement points must be recorded, deviations from design flagged correctly, and both seeded defects correctly identified with cause and remedy to pass — missing a rebar-exposure defect requires immediate remediation review.

Practice check8

Answer each question, then check it. Nothing is recorded; this is your own practice.

NCCER Masonry - Tools, Equipment, and Work Practices
1. When stripping footing forms, where should a wedge-type pry bar be positioned to avoid damaging the concrete?
NCCER Masonry - Concrete and Masonry Fundamentals
2. According to ACI field guidance principles, honeycombing that exposes reinforcing steel in a footing requires:
NCCER Masonry - Quality Control and Inspection
3. A mason measures the footing top-of-footing elevation at three stations and finds one reading 1/2 inch below the design elevation. The project tolerance is ±3/8 inch. What is the correct action?
NCCER Masonry - Concrete and Masonry Fundamentals
4. What is the most common cause of honeycombing in a poured concrete footing?
OSHA 10 - Construction Safety and Health
5. Which of the following is the primary reason form boards must be stacked flat immediately after stripping?
NCCER Masonry - Concrete and Masonry Fundamentals
6. A surface crack running along the top of a footing appeared within hours of the pour on a hot, windy day. The most likely cause is:
NCCER Masonry - Quality Control and Inspection
7. An inspection record must be signed and dated by the person who performed the inspection primarily because:
NCCER Masonry - Quality Control and Inspection
8. During form stripping, a worker notices a cold joint on the side of the footing. What information about this defect must appear on the inspection record?
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