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Concrete slab inspection checklist

A concrete slab inspection for finished, hardened concrete, filled in on a phone after the pour. Work area by area (a bay, a pour, a wall or a flight of steps): check the finish against the specified finish, levels, falls, joints and saw cutting, sealant, embeds and curing. Enter the flatness readings (F-numbers from the flatness report, or a straightedge gap) and any cover meter readings next to the specified values, and the form says which are out. Record each crack or defect with its location, GPS, size, pattern and photos, then the strength results from the laboratory. For the pour itself, use the concrete pour checklist.

For concrete contractors, superintendents, owner's representatives, quality managers and engineers checking a slab or concrete element before floor finishes, equipment or handover.

Written for any country. Choose US or metric units on page 1. The notes quote a US federal guide specification and OSHA where they help, and HSE on silica dust in the UK; your own specification sets every limit.

  • Area by area: element type, specified finish, levels, falls, joints, saw cut timing as recorded, sealant, embeds and curing
  • Flatness and levelness (F-numbers or straightedge) and cover meter readings compared with the values you enter from the specification
  • Each crack or defect with location, GPS, width, length, pattern and photos; widths can be estimated from a photo
  • Strength results from the laboratory with the specified strength and the acceptance as reported
  • Actions with priority, owner and due date, and signatures
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What is checked in a concrete slab inspection?

A slab inspection is useful when every reading sits next to the value the specification asks for, every crack and defect has a reference, a position and a photo, and each finding ends in an action with an owner. That is what the engineer needs to decide on repairs, and what the owner needs before floor finishes or racking go in.

Last updated . Facts checked by the SiteSurvey team on 27 October 2026 against Unified Facilities Guide Specifications, UFGS 03 30 00 Cast-in-Place Concrete (USACE, NAVFAC, AFCEC), OSHA 29 CFR 1926.701, Concrete and masonry construction, general requirements (eCFR), OSHA 29 CFR 1926.1153, Respirable crystalline silica (eCFR) and HSE, silica dust (construction).

How to inspect a finished concrete slab

Do it once the slab is finished and saw cut, and again before floor finishes, racking or handover.

  1. Set up the inspection

    Enter the contractor, the specification and drawings, the units you work in and the pour records for the areas you will walk.

  2. Walk each area

    Add each bay, pour or element. Check the finish, levels, falls, joints, sealant, embeds, curing evidence and protection, and say what needs doing for anything not right.

  3. Enter the readings

    Type the specified F-numbers and the measured values from the flatness report, or the straightedge gap and the allowed gap. Add cover meter readings if you took them. The form flags anything below the specification and asks where it is.

  4. Record cracks and defects

    Add each crack, honeycombed patch, spall or other defect with a reference, its position and photos. For a crack, record the pattern, width and length, and whether one side is higher.

  5. Add test results

    Enter each strength result from the laboratory report with the specified strength, and the acceptance as the testing agency or engineer reports it.

  6. Actions and sign-off

    List each repair or referral with a priority, owner and date, choose the decision and sign with the contractor.

What makes a slab inspection useful

Cracks and defects in this area, one item each with reference, location, GPS, size and photos

Bay 2, C to E / 1 to 6, placed 7 Oct. C1: nine short, roughly parallel cracks mid-panel D/3 to D/4, longest 3.5 ft, widest 0.02 in by crack card, no offset, none crossing a saw cut. Pour on a hot, windy afternoon. Referred to the engineer: rout and seal or monitor before racking.

Fictional example. Record the actual evidence and approved arrangements for your job.

A common recording mistake

Writing 'some cracking in bay 2' with no count, width, position or photo, so nobody can tell later whether the cracks have grown or which ones were repaired.

What happens next

Send the report to the engineer, record the agreed repair as an action, and re-inspect with the flatness retest and the 28-day results before acceptance.

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Every question in the concrete slab inspection template

An inspection of finished, hardened concrete slabs and elements: each area or pour with its element type, finish against the specified finish, dimensions, falls, joints and saw cut timing, sealant, embeds, curing evidence and protection, flatness and levelness (F-numbers or straightedge) and cover meter readings against the specified values, each crack and defect with location, size, pattern and photos, strength results from the laboratory, actions and sign-off. 4 sections and 128 questions. Follow-up questions and guidance appear only when an answer calls for them, so the person on site never sees the ones that do not apply.

Make it your own: every question is editable

This is a starting point, not a fixed form. Once it is in your SiteSurvey account you can reword any question, add or remove questions, sections and answer options, and add your own logo, so it fits the way your team works and the jobs you do.

Details you only enter once

Add this form to a project in SiteSurvey and it fills in what the project already knows, so nobody on site retypes it and every form on the job uses the same names. Anything filled in can still be changed.

  • Project: the project name
  • Site address: the site address, from the space or the project
  • Client or owner: the project's customer

Inspection details

Fill in before you walk the slab.

  • ProjectShort answer

    Filled in from the project in SiteSurvey.

    Fills in from the project name
  • Site addressShort answer
    Fills in from the site address, from the space or the project
  • Client or ownerShort answer
    Fills in from the project's customer
  • Location (GPS)Short answer
  • Inspection date*Date
  • Inspected by*Short answer
  • Concrete contractorShort answer
  • Engineer or architectShort answer
  • Specification and drawings inspected against*Short answer

    For example spec section 03 30 00, drawings S-101 rev C and the joint layout S-110.

  • Units used on this inspection*Choose one
    • US customary (inches, feet, psi)
    • Metric (mm, m, MPa)
  • StageChoose one
    • After finishing and saw cutting
    • Before floor finishes or equipment
    • Before acceptance or handover
    • Re-inspection after repairs
    • Other
  • Pour recordsShort answer

    Pour card and pour checklist references for the pours inspected.

  • CheckThis is a site record of the hardened concrete: what was seen, measured and photographed. It does not accept or approve the concrete. Tolerances, crack width limits, cover and strengths come from the specification, the drawings and the engineer, and are entered by the inspector; the form supplies none of its own.
  • Walk Cam: slab walk-roundWalk Cam video with voice-to-text

    Optional. Film a guided walk-round on the SiteSurvey app.

  • Weather on siteAnswer

Areas and elements

  • GuidanceAdd one area for each bay, pour or element. Enter the specified values from your specification next to each reading; the form compares them. Record each crack or defect once, as an item with its location and photos.
  • GuidanceF-numbers: where the specification calls for them, the flatness contractor tests to ASTM E1155 and issues a report. UFGS 03 30 00 (where a job uses it) requires the test within 24 hours of the final troweling, a report with a key plan of the readings, and floors that miss the tolerance repaired and retested after the repair is approved. Take the overall and local values from that report.
  • GuidanceUFGS 03 30 00 (3.15), where a job uses it, asks for the structure to be inspected before acceptance for cracks, damage and substandard concrete that may affect its service life, with a report recommending repair, removal or remediation, approved before the corrective work starts. This form is that kind of record.
  • Areas
    Repeat for each area. Each one asks:
    • Area or pour*Short answer

      For example Bay 2, grids C to E, 1 to 4, or Level 2 deck pour 3.

    • Element*Choose one
      • Slab on grade
      • Suspended slab or deck
      • Wall
      • Steps or stairs
      • Column or pier
      • Topping or screed
      • Other
    • Date placedDate
    • Where is it?Short answer
    • Specified finishChoose one
      • Steel trowel (hard trowel)
      • Float
      • Broom
      • Scratched
      • Exposed aggregate
      • Formed (as struck)
      • Formed (smooth or rubbed)
      • Other
    • Where the finish is specifiedShort answer

      Specification section or drawing note.

    • Photos of the areaPhotos

      An overall view from a corner, then the details.

    • Surface finish matches the specified finishChoose one

      Texture, trowel or broom finish and colour as the specification and any approved sample show.

      • Acceptable
      • Action needed
      • Not checked
      • Not applicable
    • What needs doing, or why not checkedNotes
      Shown only when the answers above make it relevant
    • Dimensions, levels and set-downs as drawnChoose one

      Edge thickness, steps in level, recesses and set-downs.

      • Acceptable
      • Action needed
      • Not checked
      • Not applicable
    • What needs doing, or why not checkedNotes
      Shown only when the answers above make it relevant
    • Falls to drains and channels where the drawings show themChoose one
      • Acceptable
      • Action needed
      • Not checked
      • Not applicable
    • What needs doing, or why not checkedNotes
      Shown only when the answers above make it relevant
    • Contraction joints and construction joints where drawn, straight and clean, edges not ravelledChoose one
      • Acceptable
      • Action needed
      • Not checked
      • Not applicable
    • What needs doing, or why not checkedNotes
      Shown only when the answers above make it relevant
    • Joint sealant or filler where specified, at the time the specification setsChoose one

      UFGS 03 30 00, for example, seals joints that will receive floor finishes after the curing period.

      • Acceptable
      • Action needed
      • Not checked
      • Not applicable
    • What needs doing, or why not checkedNotes
      Shown only when the answers above make it relevant
    • Embeds, anchor bolts, sleeves, drains and penetrations where drawn and undamagedChoose one
      • Acceptable
      • Action needed
      • Not checked
      • Not applicable
    • What needs doing, or why not checkedNotes
      Shown only when the answers above make it relevant
    • Curing evidence seen (compound, sheets, blankets or wet cure)Choose one
      • Acceptable
      • Action needed
      • Not checked
      • Not applicable
    • What needs doing, or why not checkedNotes
      Shown only when the answers above make it relevant
    • Protruding starter bars and dowels capped or guardedChoose one

      US: OSHA 29 CFR 1926.701(b) requires protruding reinforcing steel that someone could fall onto to be guarded against impalement.

      • Acceptable
      • Action needed
      • Not checked
      • Not applicable
    • What needs doing, or why not checkedNotes
      Shown only when the answers above make it relevant
    • Finished surface protected from following tradesChoose one
      • Acceptable
      • Action needed
      • Not checked
      • Not applicable
    • What needs doing, or why not checkedNotes
      Shown only when the answers above make it relevant
    • Saw cutting as recorded by the contractorShort answer

      When the joints were cut after finishing, and the depth, from the contractor's log.

    • What the specification requiresShort answer
    • Flatness and levelness*Choose one

      Use the method your specification names.

      • F-numbers (ASTM E1155 report)
      • Straightedge
      • Not measured
    • Specified overall FFNumber
      Shown when “Flatness and levelness” is “F-numbers (ASTM E1155 report)”
    • Specified overall FLNumber
      Shown when “Flatness and levelness” is “F-numbers (ASTM E1155 report)”
    • Measured overall FFNumber
      Shown when “Flatness and levelness” is “F-numbers (ASTM E1155 report)”
    • Measured overall FLNumber
      Shown when “Flatness and levelness” is “F-numbers (ASTM E1155 report)”
    • Specified minimum local FFNumber

      Leave blank if the specification gives none.

      Shown when “Flatness and levelness” is “F-numbers (ASTM E1155 report)”
    • Specified minimum local FLNumber
      Shown when “Flatness and levelness” is “F-numbers (ASTM E1155 report)”
    • Lowest local FF measuredNumber
      Shown when “Flatness and levelness” is “F-numbers (ASTM E1155 report)”
    • Lowest local FL measuredNumber
      Shown when “Flatness and levelness” is “F-numbers (ASTM E1155 report)”
    • Straightedge lengthShort answer

      For example 10 ft, or 3 m.

      Shown when “Flatness and levelness” is “Straightedge”
    • Largest gap under the straightedgeNumber

      In the units chosen on page 1.

      Shown when “Flatness and levelness” is “Straightedge”
    • Gap the specification allowsNumber
      Shown when “Flatness and levelness” is “Straightedge”
    • Flatness against the specificationWorked out by the form
      Shown only when the answers above make it relevant
    • a_flat_failWorked out by the form
    • Where it is outShort answer

      Grid or area of the high or low spot.

      Shown only when the answers above make it relevant
    • Position (GPS)Short answer
      Shown only when the answers above make it relevant
    • Photos of the straightedge or the out-of-tolerance areaPhotos
      Shown only when the answers above make it relevant
    • Cover meter readings taken?Yes or No
    • Specified cover (minimum)Number

      From the drawings. In the units chosen on page 1.

      Shown when “Cover meter readings taken?” is Yes
    • Lowest cover measuredNumber
      Shown when “Cover meter readings taken?” is Yes
    • Cover meter used and where the readings were takenShort answer
      Shown when “Cover meter readings taken?” is Yes
    • Cover against the specificationWorked out by the form
      Shown when “Cover meter readings taken?” is Yes
    • a_cover_lowWorked out by the form
    • Cracks and defects in this area
      Repeat for each crack or defect. Each one asks:
      • Reference*Short answer

        For example C1, or HC2. Mark the same reference on the drawing.

      • What is it?*Choose one
        • Crack
        • Honeycombing or voids
        • Scaling
        • Spalling
        • Pop-outs
        • Cold joint
        • Exposed reinforcement
        • Crazing
        • Dusting or weak surface
        • Damage (impact, tyre marks, stains)
        • Other
      • LocationShort answer

        Grid and distance from a grid line, for example C/3, 4 ft east of the column.

      • Position (GPS)Short answer
      • Crack patternChoose one
        • Single straight crack
        • Several short, roughly parallel cracks
        • Random or map pattern
        • Along a joint or a reinforcement line
        • From a corner, opening or penetration
        • Other
        Shown when “What is it?” is “Crack”
      • Type of crack, if knownChoose one

        As judged by the engineer or an experienced inspector. Leave as Not known if unsure.

        • Plastic shrinkage
        • Drying shrinkage
        • Settlement
        • Thermal
        • Structural: refer to the engineer
        • Not known
        Shown when “What is it?” is “Crack”
      • How manyNumber

        Approximate count in this location.

        Shown only when the answers above make it relevant
      • Width at the widest pointNumber

        Crack width gauge or card. A measure from a photo is an estimate only. In the units chosen on page 1.

        Shown when “What is it?” is “Crack”
      • Crack width limit from the specification or engineerNumber

        Leave blank if none is given.

        Shown when “What is it?” is “Crack”
      • Width against the limitWorked out by the form
        Shown when “What is it?” is “Crack”
      • LengthNumber

        Tape, or a photo measure with a known size in the same plane (an estimate). In the units chosen on page 1.

      • Width of the affected areaNumber
        Shown only when the answers above make it relevant
      • DepthNumber
        Shown only when the answers above make it relevant
      • One side higher than the other, or moving?Yes or No
        Shown when “What is it?” is “Crack”
      • CheckOn jobs that use UFGS 03 30 00, excessive voids and honeycombing are listed as signs of non-conforming concrete and a reason for the owner to ask for more sampling and testing (3.14.3.9). Tell the engineer.
        Shown when “What is it?” is “Honeycombing or voids”
      • PhotosPhotos

        One wide shot to show where, one close up with a scale or gauge.

      • Action*Choose one
        • Repair needed
        • Refer to the engineer
        • Monitor
        • No action
      • Proposed repair or what the engineer is askedNotes

        Agree the repair method with the engineer before work starts.

        Shown only when the answers above make it relevant
    • Cracks and defects recordedWorked out by the form
    • Needing repair or the engineerWorked out by the form
    • a_cracksWorked out by the form
    • This area: items needing actionWorked out by the form
    • Not checkedWorked out by the form
  • Areas inspectedWorked out by the form
  • Cracks and defects recordedWorked out by the form
  • Of which cracksWorked out by the form
  • Areas out of the specified flatnessWorked out by the form
  • Area items needing actionWorked out by the form
  • Not checkedWorked out by the form

Curing and test results

  • Curing method usedChoose one
    • Curing compound
    • Wet cure (wet burlap, sprinkling or ponding)
    • Curing sheets
    • Curing blankets
    • Left in forms
    • Mixed
    • Other
  • Curing the specification requiresShort answer

    Method and period, from the specification.

  • Curing record seen?Yes or No
  • What the record shows, or what is missingNotes
  • GuidanceEnter each strength result from the laboratory report with the specified strength. Acceptance follows the criteria in your specification, not one result against the specified strength: UFGS 03 30 00, for example, requires the compressive tests to meet the specification and ACI 301, and calls for cores tested to ASTM C42 where the in-place strength is in doubt. Record the acceptance as the testing agency or engineer reports it.
  • Strength results received
    Repeat for each result. Each one asks:
    • Report and sample set*Short answer

      Laboratory report number and set, for example R-2219, set 4.

    • Area or pour it representsShort answer
    • Date sampledDate
    • Test age (days)Number
    • Is this the specified test age?Yes or No

      For example the 28-day result where the specification names 28 days.

    • Strength result as reported*Number

      The strength test result on the report (usually the average of the specimens). In the units chosen on page 1.

    • Specified strengthNumber
    • Result against the specified strengthWorked out by the form
    • Acceptance as reported by the testing agency or engineer*Choose one
      • Meets the specification
      • Does not meet the specification
      • Not assessed yet
      Shown when “Is this the specified test age?” is Yes
    • What happens next (cores, review, repair)Notes
      Shown when “Acceptance as reported by the testing agency or engineer” is “Does not meet the specification”
  • Results enteredWorked out by the form
  • Below the specified strength at the specified ageWorked out by the form
  • Not meeting the specificationWorked out by the form
  • Results still awaited?Yes or No
  • WhichShort answer
    Shown when “Results still awaited?” is Yes
  • Laboratory and flatness reports (PDF or photos)Photos

Result, actions and sign-off

  • Items needing actionWorked out by the form
  • ResultWorked out by the form
  • Actions
    Repeat for each action. Each one asks:
    • Action*Notes
    • PriorityChoose one
      • Urgent: safety
      • Before floor finishes or equipment
      • Before acceptance
      • Monitor
    • Who will do it*Short answer
    • Due byDate
    • Status*Choose one
      • Open
      • In progress
      • Done, checked
    • Photo when donePhotos
      Shown when “Status” is “Done, checked”
  • Actions still openWorked out by the form
  • Decision*Choose one
    • No action needed
    • Accept once the listed repairs are done
    • Refer to the engineer before acceptance
  • Next check or re-inspection dateDate
  • CheckRepairs that grind, cut, drill or core concrete make silica dust. US: OSHA 29 CFR 1926.1153 applies, with the controls in its Table 1 for tasks such as floor grinders, handheld grinders and drills. UK: HSE names cutting, drilling, grinding and polishing concrete as dusty tasks that need controls.
  • Summary for the clientNotes
  • Inspector nameShort answer
  • Inspector signature*Signature
  • Concrete contractor nameShort answer
  • Concrete contractor signatureSignature

See it filled in

A completed concrete slab inspection report, made by SiteSurvey from a fictional site visit: every answer, the photos, the guidance that applied and the sign-off, ready to send as a PDF.

See completed form (PDF) ↗

Concrete slab inspection FAQs

Is this the same as a concrete pour checklist?

No. This form inspects the concrete after it has hardened: finish, joints, flatness, cracks and defects, and the test results. The concrete pour checklist records the pour itself (delivery tickets, slump, samples, placing and curing), and the concrete pour card is the trade sign-off before the pour. Many jobs use all three.

When are floor flatness F-numbers measured?

When the specification asks for them, F-numbers are measured to ASTM E1155 soon after finishing. On jobs that use the federal guide specification UFGS 03 30 00, the slab is tested within 24 hours of the final troweling, the flatness inspector gives a report with a key plan and the E1155 results, and floors that miss the specified values are repaired and retested after the repair method is approved. Enter the specified and measured values from that report in the form.

Source: Unified Facilities Guide Specifications, UFGS 03 30 00 Cast-in-Place Concrete (USACE, NAVFAC, AFCEC).

How wide can a crack in a slab be before it needs repair?

The form does not set a limit, because the answer depends on the slab's use, exposure and the specification. Enter the limit from the specification or the engineer, if there is one, and the form compares each crack width with it. UFGS 03 30 00, for example, asks for the structure to be inspected before acceptance for cracks, damage and substandard concrete that may affect its service life, with a report recommending the repair, approved before corrective work starts.

Source: Unified Facilities Guide Specifications, UFGS 03 30 00 Cast-in-Place Concrete (USACE, NAVFAC, AFCEC).

Does a 7-day strength result below the specified strength mean the concrete has failed?

Not on its own. Acceptance follows the criteria in the specification at the test age it names (28 days in UFGS 03 30 00 unless a job picks 56 or 90 days), so the form treats earlier results as information. UFGS 03 30 00, for example, requires the compressive tests to meet the specification and ACI 301, and calls for cores tested to ASTM C42 where there is evidence the in-place strength falls short. Record the acceptance as the testing agency or engineer reports it.

Source: Unified Facilities Guide Specifications, UFGS 03 30 00 Cast-in-Place Concrete (USACE, NAVFAC, AFCEC).

Why does the form ask about protruding dowels and starter bars?

Slabs are often poured in bays with dowels or starter bars left sticking out for the next pour, and people walk past them for days. In the US, OSHA 29 CFR 1926.701(b) requires protruding reinforcing steel that someone could fall onto to be guarded to eliminate the hazard of impalement. The check sits in each area so uncapped bars are an action with an owner.

Source: OSHA 29 CFR 1926.701, Concrete and masonry construction, general requirements (eCFR).

What should I watch for when the repairs are done?

Grinding high spots, cutting out spalls, routing cracks and drilling cores all make dust from concrete, which contains silica. In the US, OSHA 29 CFR 1926.1153 applies, and its Table 1 sets controls for tasks such as floor grinders, handheld grinders and drills. In the UK, HSE names cutting, drilling, grinding and polishing as tasks that create silica dust. Agree the repair method with the engineer first, then record it as an action with an owner and a photo when done.

Sources: OSHA 29 CFR 1926.1153, Respirable crystalline silica (eCFR) and HSE, silica dust (construction).

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