In large commercial construction defect lawsuits, proving structural failures is the foundation of your case, whether you’re seeking damages or defending against liability. Structural failures affect property value, safety, and business operations.

Without solid evidence and expert testimony, your construction defect claim crumbles.

This guide walks you through the evidence requirements, expert witness role, discovery strategy, and proof methodology in large Florida construction law cases.

Florida courts, proving structural failures requires more than just identifying the defect, you must prove each element by clear and convincing evidence under Florida Statute § 90.702.

Physical Documentation

Photographic and video evidence showing visible cracking, displacement, water intrusion, or deterioration forms the visual record. Thermal imaging and moisture readings document hidden defects in structural cavities or under finish materials.

Structural Engineering Inspection Reports

An independent structural engineer must perform a hands-on inspection and issue a detailed written report. The report should include:

• Description of the defect’s location and extent
• Measurements of cracks, deflections, or gaps
• Comparison to building code standards and the original construction specifications
• Assessment of whether the defect poses an immediate safety risk

Testing and Analysis

For concrete defects, cores or petrographic analysis identify material quality issues. For steel, ultrasonic thickness testing or coating analysis reveals corrosion. Material testing proves whether the problem stems from defective materials or installation error.

This evidence must be admissible and defensible under Florida’s rules of evidence and expert testimony standards (Fla. Stat. § 90.702).

Florida Building Code Compliance

In Florida, this typically means compliance with the Florida Building Code, which adopts the International Building Code with Florida amendments. Your structural engineer must compare the defect to the applicable code section and explain how it fails.

For example, if foundation settlement exceeds acceptable limits under FBC Chapter 3, or if a load-bearing wall has insufficient shear transfer capacity per FBC Chapter 2, your expert must cite the specific code section and explain the deviation.

Contract Specifications

If the construction contract specified performance standards higher than code (common in commercial projects), you must prove the defect violates those contractual obligations.

Many commercial contracts include express warranties. Under Florida law, breach of express warranty is easier to prove than negligence, you need only show the condition fails to match the written promise.

Identifying the Root Cause

A structural engineer’s causation analysis must determine how and why the defect occurred.

Root causes typically include:

• Design error (architect/engineer failed to calculate loads correctly)
• Material defect (concrete didn’t meet strength specifications)
• Workmanship error (improper installation, inadequate curing, missed code requirements)
• Inadequate supervision (general contractor failed to oversee subcontractors)

Determining causation often requires commercial litigation discovery and expert analysis to connect the defect to the defendant’s actions.

Eliminating Alternative Causes

Your expert must address and rule out competing explanations:

• Was the defect caused by normal wear and tear? (Prove it occurred within reasonable time after completion.)
• Could poor maintenance by the owner explain it? (Prove maintenance was adequate.)
• Is the defect due to site conditions the defendant should have anticipated? (Show it was predictable and addressable.)

Connecting the Cause to the Defendant

Finally, you must prove the defendant, contractor, architect, engineer, or material supplier, had the duty and failed to meet it:

• Did the general contractor supervise subcontractors? (Show they didn’t.)
• Did the architect review shop drawings? (Show they were inadequate or not reviewed.)
• Were materials tested before installation? (Show they weren’t, or were defective.)

Preserve the Scene

Take dated photographs and video of all visible defects.

Collect Existing Records

These documents often prove what the contractor promised and whether they delivered.

Hire a qualified structural engineer early. The engineer should:

1. Conduct a Detailed Site Inspection: Measure, photograph, and document every aspect of the defect
2. Obtain Building Permits and Inspections Records: From the local permitting authority to see what code requirements applied and whether inspections were passed
3. Review Construction Documents: Compare the actual structure to the approved plans and specifications
4. Test Materials: If necessary, perform concrete strength testing, steel coating analysis, or moisture testing
5. Perform Calculations: Show mathematically that the structure fails to meet code or contract requirements
6. Prepare a Written Report: Document all findings in a detailed, court-admissible engineering report

The engineering report is your backbone. It must be specific, measurable, and defensible.

Design and Construction Documents

• Structural drawings and calculations prepared by the engineer of record
• Change orders showing deviations from the original design
• Submittals and shop drawings approved by the architect or engineer
• RFIs (Requests for Information) revealing design ambiguities
• Construction schedules showing time pressures that may have compromised quality

Inspection and Testing Records

• Quality assurance inspection reports from the general contractor
• Third-party inspection reports (if the owner hired independent inspectors during construction)
• Material test reports showing concrete strength, steel properties, or other acceptance criteria
• Warranty claims or punch-list items showing the contractor knew about defects

Expert Reports

• Any reports or studies the defendant commissioned about the defect
• Expert opinions they may have obtained
• Damage assessment reports filed with insurance carriers

Communications

• Emails and correspondence showing knowledge of construction problems
• Meeting minutes discussing defects or code violations
• Change order requests revealing design or material issues

In Florida, proving structural failures almost always requires expert testimony.

Your structural engineer will provide expert opinion on:

1. Existence and Extent of Defect: “The foundation has settled 2.5 inches beyond acceptable limits.”
2. Code Violation: “This settlement exceeds the limits in FBC Section 3.2 (now IBC 2020 equivalency).”
3. Causation: “The settlement was caused by inadequate soil bearing capacity, which should have been identified in the geotechnical investigation.”
4. Defendant’s Role: “The structural engineer failed to require a soil boring, which is a standard of care for foundation design.”
5. Damages: “Remediation requires underpinning at an estimated cost of $X.”

Expert testimony can be challenged through cross-examination, so your expert must be knowledgeable, composed, and clear in explanations.

For a general contractor, this means:

• Hiring qualified subcontractors
• Supervising work to ensure code compliance
• Testing materials before installation
• Following the specifications and change orders

For an architect or engineer, this means:

• Designing to code
• Reviewing shop drawings
• Performing site inspections
• Issuing stop-work orders for non-compliant work

For a material supplier, this means:

• Providing materials meeting specifications
• Testing materials before delivery
• Providing accurate documentation of material properties

Under Florida’s comparative fault rules (Fla. Stat. § 768.81), liability can be apportioned among multiple defendants. If the owner’s failure to maintain contributed to the defect, or if poor design combined with poor execution caused the problem, liability may be split.

This is why identifying all potentially responsible parties early is critical. Large commercial structures often involve multiple contractors, engineers, and designers, and each may share liability.

Under Florida law, construction defect claims must generally be filed within four years from the date the defect was discovered (or should have been discovered).

Critical: The statute of limitations can be earlier if the defect is latent. Courts may find the clock started when an owner had reason to suspect a defect, even if they didn’t obtain expert confirmation.

Start the investigation immediately upon discovery.

Not every construction difference is a defect.

Cosmetic issues or minor variations from plans are typically not actionable.

Establishing the defect exists is not enough. Many defect cases fail because the plaintiff cannot prove which defendant caused it. Multiple parties may have had a hand in the problem:

• Did the architect’s design fail to account for soil conditions?
• Did the contractor install materials outside the design envelope?
• Did the material supplier provide substandard concrete?

Without clear causation, liability is uncertain.

Structural engineering experts typically charge:

• Initial investigation and report: $5,000-$25,000 (depending on complexity)
• Deposition testimony: $2,000-$5,000 per day
• Trial testimony: $3,000-$10,000+ per day

Large commercial cases may require multiple experts (structural engineer, geotechnical engineer, contractor, architect). Budget accordingly.

Many large commercial cases settle once credible expert evidence is presented, which can save both sides substantial litigation costs.