How to Read a Foundation Inspection Report

You just paid $300 to $1,000 for a foundation inspection, and the report reads like an engineering exam. Elevation numbers, crack widths in fractions of an inch, phrases like “monitor” and “further evaluation” — none of it tells you in plain English whether your Phoenix, Arizona home needs work now or can wait. This guide translates the jargon line by line, so when you’re ready to act, we can review the findings and tell you straight whether repair is warranted.

The floor-level (elevation) survey — what the numbers mean

Most inspection reports open with a floor-level, or elevation, survey. An inspector walks a grid pattern across your slab with a laser level or manometer and records the height of the floor at dozens of points, then compares them to find the highest and lowest spots in the house. The result is usually expressed as a differential — the number of inches between the highest and lowest reading.

As a rough reference point, many foundation inspections treat differentials under about 1 inch across a 20-foot span as within normal tolerance for an Arizona slab, while readings that climb toward 2 inches or more — especially concentrated in one corner or along one wall — tend to correlate with active settlement. The exact threshold your inspector applies can vary with your home’s age, soil, and slab type, so don’t fixate on a single number in isolation. What matters more is the pattern: a smooth, gradual slope across the whole house reads very differently than a sharp dip that shows up on the diagram right where you’ve noticed a stuck door.

Look for the elevation map itself, not just the summary paragraph. A good report includes a floor plan with the actual readings plotted point by point, so you can see exactly where the low spots are and whether they line up with the cracks, gaps, and doors that prompted the inspection in the first place.

Crack measurements and why width and direction matter

Next comes the crack log — usually a table or a set of photos with measurements written directly on the wall or slab. Two things matter here far more than the crack’s length: its width and its direction.

Width is typically measured with a crack comparator card, and most inspectors use similar rules of thumb:

• Hairline to 1/8 inch — common in Phoenix stucco and drywall from ordinary curing, humidity swings, and seasonal soil movement; usually cosmetic.
• 1/8 inch to 1/4 inch — the range where inspectors typically start flagging a crack for closer attention, especially if it’s widening.
• Over 1/4 inch, or a crack you can slide a coin into, generally moves a report from “monitor” toward “further evaluation” or “repair recommended.”

Direction tells the rest of the story. A vertical crack usually points to straightforward settling and is often the least urgent. A horizontal crack — particularly in a block or poured foundation wall — can signal lateral pressure and warrants a closer look regardless of width. A stair-step crack, which zigzags along the mortar joints of a block or brick wall, is one of the more common patterns inspectors call out because it tracks how differential settlement pulls a masonry wall apart along its weakest seams. If your report lists a crack as stair-step and pairs it with an elevation reading on the low side of the house, that’s not a coincidence worth ignoring. Our guide on which foundation cracks are serious walks through more photo examples if you want to compare against what’s on your own walls.

If the report recommends a repair for cracking specifically, foundation crack repair covers how that process typically works, including when injection or reinforcement is the right call versus simple cosmetic patching.

Decoding the severity language

Reputable reports avoid alarmist language, which is exactly why the wording can feel vague if you don’t know the shorthand. You’ll generally see findings sorted into three tiers:

• Monitor — the finding is within a range considered normal or low-risk today, but the inspector wants it tracked over time (typically every 6 to 12 months) to confirm it isn’t progressing.
• Further evaluation recommended — the reading or crack pattern is outside normal tolerance, or the evidence is ambiguous enough that a more detailed assessment (sometimes by a structural engineer) is warranted before deciding on repair.
• Repair recommended — the inspector found clear, active signs of structural movement and believes intervention is warranted rather than continued observation.

These tiers are cumulative rather than a strict ladder — a report can list several “monitor” items alongside one “repair recommended” finding, and each should be read on its own. Skimming straight to the summary paragraph and missing the individual findings is the single most common way homeowners misread their own report.

Settlement vs. heave in the findings

Not every irregular reading means the same thing. Reports typically distinguish between two opposite movements, and mixing them up leads to the wrong conclusion about what’s happening under your slab.

Settlement is downward movement — soil beneath the foundation compresses, erodes, or loses moisture and the slab or footing sinks. It’s usually indicated by low elevation readings concentrated at one edge or corner, doors that stick at the top on the low side, and cracks that widen toward the bottom.

Heave is upward movement — expansive clay soils common in parts of the Phoenix Valley absorb moisture and swell, pushing the slab up. Heave often shows up as elevated readings near a specific area (frequently close to a slab edge, planter, or irrigation line), cracks that widen toward the top, and doors binding at the bottom.

The distinction matters because the fix is different in each case. If your report doesn’t clearly state which pattern it’s describing, that’s worth asking about directly — our breakdown of settlement vs. heave goes deeper on how to tell them apart from the symptoms alone. When settlement is confirmed, foundation settlement repair outlines the stabilization approaches typically used.

A good inspection report doesn’t just list numbers — it tells you what’s actively moving and what’s simply old and stable. Learning to read the difference is what lets you make a calm, informed decision instead of an anxious one.

What “monitor it” actually means (and when to act)

“Monitor” is the word that trips up the most homeowners, because it can sound like the inspector is dodging the question. In practice, it means the current readings don’t meet the threshold for recommending repair today, but the inspector isn’t ruling out future movement either. A monitor recommendation is a request for a baseline, not a clean bill of health.

To actually monitor a finding, you need to re-measure the same points — the same cracks, the same elevation grid — on a set schedule and compare against the original numbers. That means holding onto the original report with its photos and location diagrams, since “did this crack get wider” is only answerable if you know exactly where it was and how wide it measured the first time.

Move from monitoring to action when any of the following happen:

• A crack logged under 1/8 inch grows past 1/4 inch between checks
• New doors or windows start sticking that weren’t a problem at the time of inspection
• A “monitor” item appears alongside a new finding in the same area
• You simply don’t trust your own ability to measure consistently — which is common, and reasonable

If any of that sounds like where you are, the next step is a foundation inspection that specifically re-checks the items your existing report flagged, rather than starting from zero.

Frequently Asked Questions

How do you read a foundation inspection report?

Start with the elevation survey to see the differential and where the highest and lowest points fall, then cross-reference the crack log for width and direction, and finally check whether each finding is labeled monitor, further evaluation, or repair recommended. Reading the diagram alongside the summary — rather than the summary alone — is what keeps the findings in context.

What is a normal floor-level reading?

There’s no single number that applies to every home, but many inspectors treat elevation differentials under roughly 1 inch across a typical span as within normal tolerance for the region, while readings approaching 2 inches or more, particularly if localized, tend to prompt closer scrutiny. Ask your inspector what threshold they applied to your specific report.

What crack width is a problem?

Hairline cracks up to about 1/8 inch are common and usually cosmetic. Cracks between 1/8 and 1/4 inch are typically where inspectors start paying closer attention, and anything wider than 1/4 inch — or cracks that are actively widening between checks — is more often flagged for repair, especially when paired with horizontal or stair-step direction.

What does “monitor” mean on a foundation report?

It means the finding doesn’t currently meet the threshold for a repair recommendation, but the inspector wants it re-measured on a schedule to confirm it stays stable. It’s a request to track change over time, not confirmation that nothing is happening.

Should I get a second opinion on a foundation report?

If the report feels ambiguous, if it was written by the same contractor pitching the repair, or if the recommendation and your own observations don’t line up, a second opinion is a reasonable and common step. An independent read of the same numbers — without a stake in the outcome — is one of the most direct ways to confirm whether repair is actually warranted before you spend on it.

We’ve reviewed thousands of Phoenix-area slabs, and we’re glad to look at a report you already paid for and tell you plainly what it means. If your findings lean toward “further evaluation” or “repair recommended,” contact us for a written estimate, or start with a fresh foundation inspection if it’s been a while since your last one.