By Nate MacIntyre · Principal Consultant, Construction Science Forensics, LLC
Building-envelope forensics & expert-witness services
Florida builds more, and faster, than almost anywhere in the country — and it does so in one of the
harshest climates for a building envelope. After 25+ years investigating why buildings leak, crack, and corrode, I can tell you that the same handful of defects show up again and again in Florida, regardless of price point or builder. This article walks through the ten construction defects and building failures I most often document in the field, what causes each one in a hot, humid, hurricane-exposed environment, and what the evidence usually looks like when I open the wall.
Key takeaways
– Most Florida building failures trace back to water and wind, not to exotic causes — the envelope simply has to manage more of both. – Stucco cracking, fenestration (window/door) flashing, roofing, and elevated-deck waterproofing account for a large share of the water-intrusion claims I investigate. – On the coast, concrete spalling and rebar corrosion are the slow, structural failures — now a focus of Florida’s post-Surfside condo inspection requirements. – Nearly all of these defects are detectable early. Phased inspections and good documentation are the cheapest insurance a project has.
Why Florida is different
Every building envelope manages heat, moisture, air, and structural load. In Florida, all four dials are turned up at once: intense sun and UV, high humidity with a strong inward vapor drive for much of the year, wind-driven rain and hurricane uplift, and — near the coast — salt-laden air that accelerates corrosion. A detail that performs adequately in a milder climate can fail quickly here because the loads rarely let up. That context matters for every item below.
The top 10 defects I investigate in Florida
1. Stucco cracking and water intrusion What it is: Cracking, debonding, and hidden water damage in hardcoat (cement) stucco and in exterior insulation and finish systems (EIFS) applied over wood or metal framing. What the evidence shows: Reverse-lapped or discontinuous barriers, missing or buried weep screeds at the base of the wall, and few or no control joints. Moisture testing and cut-outs almost always confirm the damage is worse behind the wall than the surface suggests.
Figure 1 — A typical hardcoat-stucco assembly and the path water takes through a surface crack into the sheathing behind it.
2. Window and door (fenestration) flashing failures What it is: Water intrusion at windows, sliding doors, and other openings caused by improper flashing rather than by the product itself.
What the evidence shows: Staining and decay directly below sill corners, caulk used in place of a pan flashing, and head flashing not properly integrated with the barrier above.
3. Roofing defects and wind-driven rain intrusion What it is: Premature leaks and blow-offs in tile, shingle, and low-slope roofs — usually a workmanship or detailing problem, not a material one. What the evidence shows: Fastener patterns that don’t match the product approval, missing peel-andstick underlayment at critical areas, and repairs layered over an unaddressed root cause.
4. Elevated balcony, walkway, and deck waterproofing failures What it is: Water penetration and, eventually, structural deterioration at elevated concrete or woodframed balconies, walkways, and decks. Why it matters now: Florida’s milestone-inspection and structural-integrity-reserve-study requirements for condominiums — enacted after the 2021 Surfside collapse — have put elevated decks and their supporting structure under far more scrutiny.
Figure 3 — Common balcony failure points: ponding at the threshold, a rail-post penetration, and corrosion beginning at the exposed slab edge.
5. Concrete spalling and reinforcing-steel corrosion What it is: Cracking, delamination, and spalling of reinforced concrete caused by corrosion of the embedded steel — the classic coastal-Florida structural defect. What the evidence shows: Rust staining and delamination that sounds hollow, exposed corroded bars at slab edges and balcony noses, and cover depths below what the drawings called for.
Figure 4 — Corrosion of embedded steel is a three-stage process. Visible spalling is the last stage, not the first.
6. Weather-resistive barrier and air/water-barrier defects What it is: Gaps, reverse laps, and unsealed penetrations in the layer that is supposed to keep water and uncontrolled air out of the wall. What the evidence shows: Discontinuities at transitions, tape and flashing that were never integrated, and moisture patterns that line up with barrier gaps rather than with the cladding above.
7. Roof-to-wall and structural connections for wind uplift What it is: Missing, undersized, or improperly fastened connectors in the continuous load path that resists hurricane uplift. What the evidence shows: Fastener counts below the manufacturer’s requirements, connectors that don’t match the structural drawings, and separation or splitting at the top plate.
Figure 5 — Wind uplift is resisted only when every connection in the load path is intact. A single missing connector breaks the chain.
8. Foundation movement, soils, and settlement What it is: Cracking and distortion caused by differential settlement, poorly compacted or expansive fill, and — in parts of Florida — sinkhole-related ground movement. What the evidence shows: Crack patterns and floor-elevation surveys that indicate direction of movement, along with geotechnical data on soils and compaction.
9. HVAC, humidity, and moisture-driven mold What it is: Condensation, elevated indoor humidity, and mold growth driven by mechanical systems and vapor management — as much a building-science issue as an equipment one. What the evidence shows: Condensation staining at supply registers and cool surfaces, duct leakage, pressure imbalances, and elevated interior humidity readings.
10. Sealant, expansion-joint, and transition failures What it is: Failed or misapplied sealant at joints and at the transitions between different materials and systems. What the evidence shows: Adhesive and cohesive failures, three-sided adhesion with no backer rod, and joints where sealant is doing a job that flashing should have done.
When should an owner bring in a forensic building expert?
As soon as a pattern emerges — recurring stains, repairs that don’t hold, or unexplained humidity and mold. Early, independent assessment usually costs far less than the repeated repairs and expanding damage that follow from treating symptoms. This article is general educational information, not project-specific engineering or legal advice. Every building is different; conditions should be evaluated on their own facts.