Technical content for those who want to understand construction, diagnosis and judicial expert testimony in civil engineering.
In this blog I write about the topics I deal with every day in practice:
building pathology, building inspection, judicial expert testimony, judicial technical assistance,
precautionary neighborhood surveys, works acceptance and the technical standards that guide this work.
The content is written in first person, with the practical vision of someone who has been in the field
for years and knows that a well-prepared expert report can decide cases, prevent conflicts and
protect people.
Building diagnostics: when the report and the proof unite to decide
In many judicial proceedings I have participated in, the technical report was the piece that turned the case around — not because it was dramatic, but because it was precise. When building diagnostics are done well, the evidence has the weight that documents alone cannot carry.
Technical diagnostics combine visual inspection, documentary analysis, material testing when applicable, and the engineer's experience reading what the building shows. A crack is not just a crack: it indicates load, deformation, time, improper maintenance or hidden pathological process.
When the technical report and the expert proof are aligned — one supporting the other — the result is a technically robust conclusion. The judge reads, understands and can decide. The lawyer defends or challenges with arguments, not just narratives. The technical truth emerges from the method, not from authority.
That is why I dedicate time to documentation during inspections: photographs, measurements, descriptions, technical references. This care is not bureaucracy — it is what makes the diagnosis credible and the proof useful.
The property manager's civil liability: what building inspection protects
When a building shows pathological problems — infiltration, cracking, facade deterioration, structural failures — the question is always: who is responsible? The answer depends on what can be technically proven. And this is where building inspection plays an essential role.
A building inspection conducted periodically, following NBR 16747, identifies anomalies, classifies their risk level and recommends maintenance actions. This document protects the condominium administrator because it demonstrates that the building was monitored and that identified problems were treated or flagged for correction.
I have seen cases where condominium managers were sued for damages that, had there been an inspection report in the file, would have been attributed to the original builder, the maintenance company or even the owner who did not comply with the recommended correction. The inspection report serves as legal protection and management tool.
Building inspection is not just for old buildings. New constructions also have deficiencies — and catching them early is much cheaper than correcting them under legal pressure. This is practical civil engineering: preventing is less expensive than repairing and defending in court.
Facades and coatings: the most common pathologies I encounter
Of all the elements I inspect in buildings, facades concentrate the highest frequency and variety of pathologies. They are directly exposed to the climate, to seasonal expansion and contraction, to design errors, execution errors and lack of maintenance. The result I see most in the field is coating detachment — at different stages, but always with identifiable causes.
Among the most recurring pathologies are: saline efflorescence resulting from infiltration of rainwater or rising damp; alligator cracking from substrate deformation or thermal cycling; incomplete coating detachment from inadequate preparation of the receiving surface; and paint blistering, usually from poor surface preparation or application in inappropriate conditions.
Each symptom has a history. In my inspections, I try to read this history before reaching the conclusion. A bubbled facade may be the result of an application error, but it may also indicate infiltration at some higher point that has not yet manifested visibly inside. Isolating the symptom without understanding the cause produces an incomplete diagnosis.
In expert proceedings, facades are a frequent source of claims. Determining whether the detachment results from builder error, design failure, improper maintenance or material incompatibility requires method and experience. That is exactly what technical expertise provides.
Expert testimony on unfinished construction: how to assess what isn't finished yet
One of the more complex challenges in engineering expertise is being called to assess a property that isn't complete. Unfinished construction appears in court proceedings involving stalled developments, abandoned contracts, budget disputes between owners and contractors, and delivery failures by construction companies.
The central question is almost always the same: what was delivered, what is missing, and who bears the cost of what remains? To answer this, the expert cannot limit himself to what is visible. He must compare what was built with what was contracted — examining drawings, specifications, the descriptive memorial, invoices and the construction schedule.
I use a percentage-of-completion methodology, breaking down the work into stages and evaluating the execution level of each phase. This allows quantifying what was done and, consequently, what remains. The resulting report shows the physical and financial execution balance — a technically defensible document that supports judicial decision.
In these cases, photographic documentation is essential. It freezes the state of the construction at a specific point in time, preventing later disputes about what was or was not in place at the time of the inspection. The camera is one of the most important tools in the expert's kit.
Garages and basements: the pathologies no one wants to see
Garages and basements concentrate some of the most serious and costly pathologies I encounter in residential and commercial buildings. Because they are underground or semi-underground spaces, they experience high rates of humidity, poor ventilation, exposure to contaminants from parking areas and, frequently, insufficient attention from managers and residents.
The most common pathologies I find in these spaces include: active infiltration through foundation walls and floor slabs; reinforcement corrosion from carbonation, moisture or aggressive agents; concrete delamination and spalling exposing reinforcement; and expansion joint failures that allow water passage.
The issue with these environments is that the problems are often visible for a long time before anyone acts. The water that appears in the corner, the rust stain on the pillar, the patch that keeps flaking — these are all warning signs that, when ignored, evolve into serious structural problems.
In my expert inspections, garages and basements always deserve special attention. What I find there often explains what is happening in the apartments above. Humidity in lower floors frequently has its origin in garage infiltration. Understanding this connection is part of the diagnosis — and part of correctly attributing responsibility.
How I answer the judge's questions without losing technical objectivity
When the expert report is delivered to the court, the work does not end there. Questionnaires are formulated by both parties — the plaintiff and the defendant — and it is the expert's obligation to answer each one objectively, technically and impartially. This is one of the most delicate parts of the expertise function.
My approach when answering questionnaires is to always return to the observed facts: what I saw during the inspection, what the documents show, what the applicable technical standards determine. I avoid personal opinions that are not supported by technical data, and I avoid hedging language that makes the answer unreadable. The judge needs a clear answer, not a qualification of a qualification.
When a question asks me to attribute responsibility, I am precise: I describe the cause of the pathology, the mechanism of damage, the probable origin and the technical standards that establish duties. From this, the legal conclusion emerges — but I do not anticipate judgments. My role is to provide the technical foundation, not to decide.
I also answer supplementary questionnaires and clarification requests with the same rigor. Expert work does not end with the report — it ends when the court's technical questions are properly answered. That is what serving justice through engineering means.
Precautionary survey as a legal defense instrument
One of the most underused tools in Brazilian civil construction is the precautionary neighborhood survey — a preventive inspection that documents the condition of neighboring properties before a construction or demolition begins. When done correctly, it protects everyone involved: the builder, the property owner and the neighbor.
The survey records, at a fixed point in time, all pre-existing cracks, infiltrations, settlements, damage to finishes and any other pathological conditions in adjacent structures. These records, when made with photographic evidence, measurements, descriptions and a technical signature, constitute legal proof of the property's condition at a specific date.
I have seen many cases where a construction company was held responsible for damage that clearly predated their project. Without the precautionary survey, the burden of proof is difficult — the neighbor states that the crack appeared after the construction started, and the builder cannot demonstrate otherwise. With the survey in hand, the defense is documented.
The ideal time for the survey is before the first earthwork or demolition. Once the machines start moving, it is too late to establish the reference state. This is a simple precaution with high protective value — and it costs much less than a judicial dispute.
Post-storm building inspection: what to check when the rain stops
After a significant storm — with strong winds, heavy rain or hail — buildings may show damage that was not visible before. In some cases, the storm reveals pre-existing vulnerabilities; in others, it causes new damage. Differentiating between the two is a technical job, not a visual impression.
The elements I prioritize in a post-storm inspection include: roof and covering condition, checking for displaced or broken tiles, detached ridges or saturated flashings; drainage systems, looking for blocked downspouts and water accumulation areas; facades, identifying fresh cracks, detachments or infiltration marks; electrical systems, when there is risk of lightning damage or water ingress; and foundation areas, looking for signs of erosion or localized settlement.
Post-storm inspection is also useful in insurance claim contexts. The technical report documents the damage, its probable cause, its relationship with the weather event and the measures required for repair. This report is the basis for claim negotiation with the insurer and, if necessary, for expert proceedings.
The faster the inspection is done after the event, the better. Evidence deteriorates: repairs are made, materials dry, damage changes. Documenting the damage right after the storm preserves evidence and makes the technical analysis more accurate.
Expert report with budget estimate: the proof that speaks the real value of the damage
In construction damage proceedings, the expert report usually describes the damage — but the judge also needs to know its financial value to order compensation. This is why many expert appointments include the task of quantifying the cost of repair as part of the technical evidence.
The repair budget estimate within an expert report must follow the same rigor as the damage diagnosis. I use official references — SINAPI, SICRO, regional price tables — and I specify the services, quantities, unit prices and total cost. The budget must be understandable to both technical and non-technical readers.
An important distinction: the budget estimate is for repair of the technical damage identified, not for general improvements or works the property would need regardless. Separating the claim from other needs is part of the expert's analytical work — and this distinction often determines the scope of compensation the court will grant.
When the technical report brings together the diagnosis of the problem and the quantification of its cost, it becomes a complete document — capable of directly supporting the judicial decision. This is the standard I set for myself in every expertise work I take on.
The technical assistant and questionnaires: the art of asking the right question
In judicial expert proceedings, the questionnaires submitted by the parties are the main instrument for directing the expert's work. A well-formulated question can reveal a technical fact that completely changes the outcome of the case. A poorly formulated question wastes an opportunity and leaves the file without essential information.
The technical assistant's role is precisely to help the lawyer formulate precise, technically correct questions that extract from the expert the information that matters for the party's defense or claim. This requires understanding the technical phenomenon involved — whether it is a building pathology, a value calculation or a construction defect — and translating it into procedurally effective questions.
I frequently work as a technical assistant for law firms in civil engineering proceedings. One of the things I have learned is that the questions that seem simple are often the most powerful. "What is the probable cause of the damage?" "Was the damage existing before the reported date?" "Which technical standard establishes the builder's duty?" — these questions, when answered in the report, become the technical foundation of the legal argument.
The technical assistant who only accompanies the inspection without contributing to the questionnaire strategy is operating at half capacity. The questionnaires are where the technical foundation of the cause is built — and this requires engineering knowledge combined with a clear understanding of what the lawyer needs.
Waterproofing: execution failure, design failure or maintenance failure?
Waterproofing is one of the elements most frequently involved in construction defect claims. When it fails, the result is infiltration — often serious, with damage to finishes, furniture, electrical systems, and significant reduction in the quality of life of residents. But identifying the cause of the waterproofing failure is not always simple.
There are three main types of failure: design failure, when the specification is inadequate for the exposure the element will face; execution failure, when the specified product is applied incorrectly, on inadequate substrate or in unfavorable conditions; and maintenance failure, when the system was adequate but was not maintained — waterproofing ages and needs periodic inspection and reapplication.
Differentiating between these causes is what the expertise does. I analyze the original design, the specifications, the execution record — when available — the age of the building, the maintenance history and the location of the infiltration. Each of these elements contributes to building the probable cause.
The practical implication is relevant: if the failure is in the design, the responsibility tends to be with the designer or the builder who adopted it. If it is in execution, it is the builder. If it is maintenance, it may fall on the condominium or the property owner. The technical diagnosis defines the legal path.
Pre-litigation technical opinion: the evidence that anticipates the lawsuit
Not every engineering problem ends up in court — and often the best way to avoid litigation is to have a clear technical opinion in hand before the dispute escalates. The pre-litigation technical opinion is exactly this: a professional document that establishes the technical facts before proceedings are filed.
In practice, I have seen many disputes resolved out of court because one of the parties had a technical opinion demonstrating the existence, cause and extent of the damage. When the evidence is documented and technically grounded, negotiating is more attractive than litigating — for both sides.
The pre-litigation opinion differs from the judicial expert report in that it is produced at the party's request, without judicial formality, but with the same technical rigor. It can be used in extrajudicial negotiations, mediation, arbitration or as supporting evidence in proceedings.
I recommend this tool especially in construction damage situations, delivery disputes and waterproofing failures. When the problem is documented early — before repairs are made, before evidence is altered — the technical analysis has much more substance. Waiting until proceedings are filed can mean losing essential evidence.
Damage quantification: how I arrive at the value that supports compensation
One of the most delicate tasks in engineering expertise in construction is quantifying damage — arriving at a figure that represents the real cost of what was damaged, not an estimate inflated by wishful thinking or deflated by defensive interest. This rigor is what makes the expert report useful for the judicial decision.
My methodology for damage quantification begins with a clear identification of what was damaged: finishes, structure, systems, furniture, productive losses. Then I survey the unit prices for each repair service, using official sources such as SINAPI and regional price tables. I apply the quantities measured during the inspection and calculate the total repair cost.
An important distinction I always make: I quantify the cost of repairing the damage caused — not the cost of correcting pre-existing deficiencies or making upgrades the property would need anyway. This boundary is technically and legally relevant. Confusing the two can make the report unacceptable or generate unjust compensation.
The final figure in the quantification report has technical support behind it. When challenged, I can demonstrate each item of the calculation. That is what gives the document its judicial credibility — not the size of the number, but the transparency of the path used to reach it.
Building inspection in commercial condominiums: what cannot be ignored
Commercial condominiums have specific characteristics that make building inspection especially important — and more complex. The coexistence of public areas, private areas, different uses, service elevators, loading docks, collective air conditioning systems and intensive human circulation creates a combination of challenges that residential buildings do not face in the same proportion.
In my inspections of commercial buildings, the elements I always include in the assessment are: structural conditions of pillars, slabs and beams; fire protection systems — a legally mandatory requirement that I see frequently neglected; waterproofing of roofs and terraces, especially in flat-roof buildings; facades and curtain walls, with particular attention to glass joint fixings; and elevators, which have specific regulation and whose maintenance must be documented.
The building inspection report for commercial condominiums also serves a specific function: it demonstrates to tenants, owners and investors that the building is maintained and monitored. In corporate real estate, this inspection history can influence contract renewal, rent negotiation and even the building's market value.
Neglecting building inspection in a commercial condominium is a management and legal risk. When something goes wrong — a fire, a structural collapse, a serious accident — the question of whether maintenance standards were followed falls on the administrator. The report is his technical defense.
Hidden defects vs. natural wear: engineering defines the line
One of the most recurring controversies in civil construction legal proceedings is the distinction between hidden defects — which are the builder's responsibility — and natural wear — which is part of the building's life cycle and is the owner's maintenance responsibility. Confusing the two, intentionally or not, generates many unjust claims and many legitimate ones that are refused without technical basis.
A hidden defect is one that was not apparent at delivery but was latent — it existed from construction, in design or in execution, and manifests itself over time. Examples: waterproofing that fails within the warranty period, a beam designed with insufficient capacity, a masonry coating applied without adequate preparation. These defects are covered by builder's warranty regardless of when they appear, within the legal terms.
Natural wear is the normal deterioration of elements due to time and use. A paint that fades after eight years outdoors, tiles that lose shine with intensive use, seals that need replacement after five years — these are not defects, they are aging. Their correction is the owner's responsibility, under proper maintenance.
Engineering defines this line precisely: it looks at the building's age, the life cycle of the failed element, the maintenance history, the original specifications and the applicable technical standards. It is not a legal judgment — it is a technical diagnosis that the judge uses to make the legal judgment.
Coating detachment: the tile that falls has a story
Ceramic tile detachment is one of the most frequent complaints I receive — both in inspections and in expert proceedings. It appears in floors, walls, facades, swimming pools, kitchens and bathrooms. But behind each detachment there is a history: of material choice, application, preparation, environmental conditions and maintenance. Reading this history is the expertise's job.
The main causes of ceramic detachment that I identify in my inspections are: inadequate substrate preparation — dust, efflorescence, loose paint, contamination by grease or moisture; incompatible adhesive mortar — wrong product for the tile type or application environment; insufficient open time — mortar already starting to set when the tile is applied; lack of expansion joints — leading to accumulated stress that eventually causes a rupture; and high porosity variation tiles applied with techniques appropriate to low porosity tiles.
When detachment occurs on a facade, the safety risk is added: a detached tile at height can cause accidents. In this case, the diagnosis urgency increases, and the inspection must classify the immediate risk and recommend interim measures before the technical discussion about responsibility.
In expert proceedings involving ceramic detachment, my work is to identify, among all the plausible causes, which one actually explains the observed pattern. The distribution of detachments, the location of failures in the adhesive bed, the condition of the substrate and the expansion joint layout are the elements that tell me the building's story. The tile that falls is the end — not the beginning.
How my technical report supports the lawyer's strategy
A common mistake I see in engineering expert proceedings is treating the technical report and the legal strategy as separate things. In practice, they are inseparable. The technical report provides the factual basis on which the legal argument is built — and a good lawyer knows how to use each technical finding strategically.
When I work as a technical assistant, I always try to understand what the lawyer needs from the technical analysis: is it proving the existence of a defect? Demonstrating that the defect predates a certain event? Quantifying damage to support a specific compensation claim? Challenging the methodology used by the opposing expert? Each of these objectives leads to a different emphasis in the analysis.
My technical report is written to be clear, objective and well-documented. It must be understood not only by a judge with engineering training — which is not always the case — but by any intelligent reader who takes the time to follow the arguments. Technical clarity is also a form of legal strategy.
I also provide technical support after the report is delivered: reviewing the opposing report to identify methodological failures, preparing technical arguments for the lawyer, and formulating supplementary questions when the initial questionnaire was not exhausted. The technical assistant's work is continuous — it does not end when the inspection is over.
Causal link in expert testimony: the question that defines responsibility
In engineering expertise, establishing the causal link is perhaps the most important and most technically demanding task. It is not enough to identify that there is damage — it is necessary to demonstrate that this specific damage was caused by this specific act or omission, in a technically demonstrable and legally applicable way.
The causal link in construction expert testimony is built from evidence: photographs with dates, technical standards that establish duties, documents demonstrating what was contracted and what was executed, material tests when applicable, and a logical technical narrative that connects the facts. When this chain is robust, the judge can follow the argument from the cause to the effect without technical gaps.
A common example: infiltration appearing in an apartment. The causal link analysis asks — where does the water enter? Through what path? Is there any element in the path that should have been waterproofed and wasn't? Who was responsible for that element? Was there adequate maintenance? Each of these questions, answered with technical evidence, builds or destroys the causal link.
When the causal link is not clearly established, the expert report may be technically correct in the description of the damage but legally useless for attributing responsibility. That is why I treat this as the central question in every expert testimony: not just what happened, but why it happened and who, technically, contributed to it happening.
Differential settlement: when the soil speaks louder than the structure
Differential settlement is one of the most serious pathologies I deal with in structural engineering expertise. When different parts of a building settle at different rates, the resulting deformations generate cracks, structural misalignments, door and window jamming, and in severe cases, risk of partial or total collapse.
The causes of differential settlement are varied: inadequate geotechnical investigation at the design stage, incorrect foundation type for the soil characteristics, changes in soil conditions during or after construction (groundwater fluctuation, nearby excavations, underground leaks), and loads not anticipated in the original structural design.
Diagnosing differential settlement requires more than just observing cracks. I analyze the crack pattern — diagonal cracks at corners, stepped cracks in masonry, horizontal cracks at floor transitions — and compare them with the structure's load distribution and the foundation type. This analysis tells me where the settlement is occurring and how severe it is.
In expert proceedings involving settlement, the geotechnical investigation is a critical document. When it was not done, or when it was insufficient for the soil complexity, this is in itself evidence of design negligence. When it was done but not followed, the responsibility moves to construction. Each case requires reading the specific history of that building and that soil.
Preventive maintenance plan: the document that protects the manager and the condominium
The preventive maintenance plan is one of the most powerful tools a condominium administrator has — and one of the least used. It is a technical document, based on the building inspection report, that establishes what maintenance activities must be performed, on which elements, at what intervals and by which specialized professionals.
From the technical point of view, the preventive maintenance plan is recommended by NBR 5674 — the standard on maintenance of construction works. It establishes a systemic approach: identifying the building's elements, their expected lifetimes and their maintenance requirements. This approach prolongs the building's life, reduces emergency intervention costs and prevents pathological problems from evolving to the point of compromising safety.
From the legal point of view, the preventive maintenance plan documents that the building is being managed responsibly. If a damage claim arises — from a resident, from a neighbor, from a service provider — the maintenance history is the manager's technical defense. Without this history, proving that maintenance was done properly becomes very difficult.
I always recommend that condominiums commission a building inspection followed by the preparation of a preventive maintenance plan. It is an investment with rapid payback: maintenance done preventively costs a fraction of corrective maintenance done under emergency pressure. And it protects the administrator from legal liability that, without documentation, can fall entirely on him.
Neighborhood damage: the engineering that proves what the construction caused
When a new construction starts next to an existing building, the risk of neighborhood damage is real. Excavations affect the soil, vibration propagates through the ground, dewatering can cause settlement, and construction activities can directly damage adjacent structures. Proving that this damage was caused by the neighboring construction — and not by other factors — is engineering work.
The technical proof of neighborhood damage begins, ideally, with the precautionary survey done before the construction starts. This survey documents the original state of the neighboring properties, establishing what was and was not there at the start of the works. When damage later appears, the comparison between the survey and the post-damage inspection is the technical foundation of the claim.
When there is no precautionary survey, the expertise becomes more complex but not impossible. I analyze the crack pattern, the construction timeline, the vibration or settlement data when available, and compare the damage with the typical effects of the type of work carried out. The technical narrative that emerges can be convincing, even without the prior reference.
In neighborhood damage proceedings, the complexity lies in demonstrating causality: not just that the damage exists, but that it was caused by the neighboring construction. This is where the quality of the technical inspection, documentation and expert argumentation makes all the difference in the outcome.
Early production of evidence: when time is the enemy of technical proof
One situation I frequently encounter in expert work is being asked to assess damage that was partially repaired, altered or even eliminated before proceedings began. When evidence is altered before the inspection, technical work becomes much more difficult — and in some cases impossible to conduct with the desired precision.
Early production of evidence is a Brazilian procedural mechanism that allows, before or during proceedings, the preservation of evidence that may disappear or be altered by the passage of time. In civil construction, this tool is essential for freezing the state of a building — a crack, an infiltration, a detachment — before repairs or further deterioration modify the technical picture.
As a technical expert appointed or requested in early evidence proceedings, my job is to rigorously document what exists at that moment: photographs, measurements, descriptions, samples when applicable. This documentation becomes the technical reference for the entire subsequent judicial discussion.
My advice to lawyers and parties involved in construction disputes: never repair the damage before having it inspected and documented. The repair solves the practical problem but destroys the legal evidence. Do it the other way around: document first, repair after. This precaution can be decisive in the outcome of the case.
Dissenting technical report: when the technical assistant must disagree
In expert proceedings, the appointed expert has a duty of impartiality — he works for the court, not for the parties. The technical assistant, on the other hand, works for the party that hired him. This means that when the assistant finds methodological errors, omissions or conclusions that do not hold up technically in the expert report, it is his job to formally express his disagreement.
The dissenting technical report — or technical contestation — is the document through which the technical assistant presents his objections to the expert's work. It must be technical, specific and well-grounded: it is not enough to say "the expert is wrong" — it is necessary to demonstrate where, how and why the analysis is deficient, citing applicable technical standards and presenting alternative evidence.
I write dissenting reports when the inspection was superficial, when the methodology was inadequate for the complexity of the case, when relevant documents were ignored, or when the conclusions do not follow logically from the observed facts. Each of these points is presented with technical precision and supported by references.
The dissenting report is not an attack on the expert — it is an instrument of quality control of technical evidence. The court deserves to receive evidence produced to the highest possible standard. When the appointed expert fails in this standard, the technical assistant who challenges it is serving justice, not just the party that hired him.
NBR 15575: what the performance standard requires from the builder
NBR 15575, the Building Performance Standard, is one of the most important standards in Brazilian civil construction — and one that generates the most expert proceedings. It came into force in 2013 and established, for the first time, objective performance criteria that buildings must meet throughout their useful life.
The standard defines minimum performance levels for structural systems, floors, internal and external masonry walls, roof systems, thermal performance and acoustic performance. It also establishes the concepts of design useful life — the time the building must function without major failures under normal maintenance conditions — and warranty periods for different building systems.
In practice, NBR 15575 gave buyers a technical basis to demand performance from builders. When a building does not meet the standard's criteria within the warranty period, there is a technical basis to claim for correction or compensation. The expert's job is to verify, in the field, whether the building meets what the standard requires.
For builders, the standard imposes obligations that go beyond what is merely stated in the contract. They must design and build to meet the minimum performance criteria, under conditions of normal maintenance by the user. This is an important point that often comes up in expertise: the builder cannot be held responsible for performance failures caused by inadequate maintenance by the condominium or the owner.
Rebar corrosion: the silent damage that compromises structures
Of all the pathologies that affect concrete structures, rebar corrosion is probably the most insidious. It develops slowly, invisibly, inside the concrete — until the day the element shows the first visible signs, usually cracks in the concrete cover, stains or, in advanced cases, spalling that exposes the compromised steel.
Corrosion occurs when the alkaline environment of the concrete — which protects the steel — is neutralized by two main processes: carbonation, where CO₂ from the atmosphere penetrates and reduces concrete alkalinity; and chloride attack, where chloride ions from marine environments, deicers or industrial environments penetrate the concrete and trigger the corrosion reaction. Both processes are invisible in the early stages, which is why prevention and monitoring matter so much.
In my structural expert inspections, corrosion almost always appears accompanied by inadequate concrete cover — the layer of concrete that protects the steel. When the cover is insufficient, the penetration of agents is faster and corrosion initiates earlier. Inadequate cover is usually a result of construction failure: badly positioned reinforcement, poorly designed formwork or concrete placement without adequate control.
The technical consequence is relevant: rebar corrosion reduces the structural capacity of the element. In columns and beams, this can mean a real safety risk. The expert inspection must evaluate not only the visible damage but also the extent and depth of corrosion, to correctly judge the severity and recommend appropriate repair — or, in critical cases, structural reinforcement.
How to formulate efficient questionnaires in engineering expertise
The questionnaire is one of the most important instruments in a judicial expert proceeding — and also one of the most misused. I have seen questionnaires with questions so vague that any answer would be valid, questions that go beyond the object of the expertise, and questions that ask for legal opinions from a technical professional. All of this weakens the evidence.
An efficient questionnaire in engineering expertise has a clear technical objective for each question. It asks what was observed, what the probable cause is, whether a specific standard was followed, what the repair cost would be. It avoids compound questions — questions with "and" that require multiple answers in one — and avoids leading questions that suggest the desired answer.
As a technical assistant, I always contribute to formulating questionnaires that maximize the technical yield of the expertise. This means knowing what the engineer needs to observe during the inspection to answer each question — and making sure those observations are feasible within the scope of the appointed expert's work.
It is also important to submit questionnaires within the procedural deadline — not at the last minute. Late questionnaires often require an extension, delay the work and create procedural friction. When the questionnaire is well-prepared and submitted on time, the process runs better for all parties — including the judge, who receives clearer technical evidence.
NBR 13752: the normative basis of engineering expertise in construction
NBR 13752 — Engineering and Architecture Expertise — is the technical standard that establishes the procedures, definitions and requirements for carrying out engineering expertise in Brazil. For anyone involved in judicial or extrajudicial expert proceedings, understanding this standard is not optional: it is the normative foundation of all the work done in this area.
The standard defines the types of expert evidence — inspection, examination, examination of documents, field testing, laboratory testing — and establishes how each should be conducted and documented. It also defines the required components of the expert report, the deadlines and the expert's professional obligations.
In judicial proceedings, the expert who follows NBR 13752 produces a report that is technically defensible and formally compliant. When technical assistants challenge the report, one of the first things they check is whether the standard was followed — and a deviation can be an opening for a legitimate challenge.
For lawyers who work with engineering proceedings, knowing the main requirements of NBR 13752 helps formulate more precise questionnaires and assess the quality of the work delivered. Many procedural discussions could be avoided — or won — if both the technical and legal teams had a clear understanding of what the standard requires of the expert.
Wall infiltration: why masking the symptom is expensive
Wall infiltration is one of the most common complaints in buildings of all ages — and one of the most often poorly resolved. The temptation to apply a waterproofing product directly over the damp wall, or repaint it to "hide" the stain, is almost irresistible for someone who wants a quick solution. The technical consequence of this approach is inevitably a more serious and more expensive problem in the medium term.
Infiltration is a symptom. The problem is the water entry path, which almost never coincides with where the stain appears. Water penetrates at one point — a roof slab, a failed expansion joint, a cracked beam-column junction, a plumbing pipe — and travels through the masonry and structure until it finds a porous surface where it becomes visible. Treating the stain without finding the entry path solves nothing.
My approach in infiltration diagnoses begins with mapping: where is the stain? What is above, laterally, and below it? Is there piping? Roof covering? External elements exposed to rain? This mapping, combined with the building history and rainfall patterns, usually indicates the most likely entry path — which I then investigate more specifically.
The technical and financial lesson is simple: a correct diagnosis and the right treatment cost less than multiple emergency repairs over years. Repainting, re-waterproofing and plastering damp walls without correcting the cause is a cycle of expenditure with no solution. It is cheaper — and calmer — to do it right the first time.
Works acceptance: what to check before signing the property delivery
The moment of works acceptance — when the property is delivered to the buyer by the construction company — is legally and technically crucial. Once the delivery receipt is signed, demonstrating that defects are the builder's responsibility becomes much more difficult. This is why a careful technical inspection before signing the delivery is an essential investment.
In works acceptance inspections, I systematically check: conformity between what was delivered and what was specified in the contract and descriptive memorial; finishing quality in all areas — floors, walls, ceilings, windows, doors; functionality of electrical, hydraulic and ventilation systems; conditions of common areas, when applicable; and any visible signs of pathological problems — cracks, moisture, deficient drainage.
When I identify problems during acceptance, I document everything — photographs, descriptions, measurements — and include it in a technical opinion delivered to the buyer before signing the receipt. This document serves two purposes: it records defects that the builder must correct, and it protects the buyer in any subsequent dispute.
Works acceptance is not a bureaucratic ceremony — it is the moment when the buyer, as the final recipient of the service, exercises quality control. Having an engineer at this stage is an investment that can save years of conflict and thousands in repairs. The delivery receipt signed without technical inspection is a legal instrument that can work against the buyer.
Cracks: learning to differentiate what is concerning from what is aesthetic
Cracks are the pathological manifestation that most worries residents and managers of buildings — and rightly so, because some cracks indicate serious problems. But it is also true that many cracks are purely aesthetic, with no structural significance and no imminent risk. The difference between the two requires technical analysis, not just visual alarm.
The first classification I make is by width. Cracks up to 0.2 mm are generally aesthetic in most structural elements — they indicate normal concrete contraction or accommodation, but do not compromise durability or safety under normal conditions. Above 0.4 mm, attention is required; above 0.6 mm, structural analysis is strongly recommended.
The second analysis is the pattern. Diagonal cracks at window and door corners usually indicate localized settling or concentrated loads. Horizontal cracks in structural walls may indicate lateral pressure. Radial cracks around penetrations indicate improper sealing. Cracks following mortar joints indicate accommodation or thermal movement. Each pattern tells a different story.
The third element is evolution: is the crack static or active? A static crack — the same today as three months ago — is less concerning than an active crack that grows progressively. Monitoring with crack gauges is a simple and inexpensive tool that answers this question with technical precision. An active crack deserves immediate structural investigation.
Judicial Technical Assistance: the technical voice inside the process
In judicial proceedings involving civil engineering matters, the parties have the right to appoint a technical assistant — an engineer who accompanies the expert process from the party's perspective, protecting their interests and ensuring that the technical evidence meets the highest standard.
The technical assistant is not a substitute for the court-appointed expert, but he can produce his own technical opinion and critically review the expert work. His role is to verify whether the inspection covered all relevant elements, whether the questionnaires were answered completely and correctly, whether the applied methodology is adequate, and whether the final conclusions are consistent with the observed facts and applicable technical standards.
In practice, the presence of a good technical assistant elevates the quality of the entire expert process. When the expert knows that his work will be scrutinized by a technically competent professional, the level of care and rigor in the report tends to increase. The technical assistant also contributes by formulating precise questionnaires and, when necessary, presenting a dissenting technical report.
My work as a technical assistant covers the entire process: I analyze the file before the inspection, accompany the survey, contribute to questionnaire formulation, review the delivered report and, when applicable, prepare the contestation. This comprehensive involvement is what allows the party to truly benefit from technical support in the proceedings.
Judicial expert testimony in construction disputes: how engineering decides cases
Civil construction is one of the areas that generates the most judicial proceedings in Brazil — and it is also one where engineering expertise is most decisive. Unlike disputes involving purely legal or contractual matters, construction disputes almost always have a technical fact at their core: was there a defect? Was the defect the builder's responsibility? How much did the damage cost?
The judicial expert is appointed by the court to answer these technical questions with scientific method and impartiality. His analysis is the technical foundation that the judge uses to form his conviction and issue the sentence. In many construction proceedings I have participated in, it was the expert report that determined the outcome — either confirming the builder's responsibility or exonerating him based on technical evidence.
This is why the quality of expert testimony in civil construction matters so much. A well-conducted expertise — with rigorous inspection, solid documentation, technically correct methodology and clear report — gives the court the information it needs to decide fairly. A poorly conducted expertise leaves technical gaps that favor the party with the better procedural argument, not necessarily the technically correct one.
In my experience as a judicial expert, the cases that are decided most fairly are those where both parties had strong technical assistants — because when both sides know the technical terrain well, the discussion elevates and the truth tends to emerge. Expert testimony is not a formality: it is the technical justice engine of civil construction disputes.
NBR 16747: the standard that gives technical basis to Building Inspection
NBR 16747, published in 2020, established in Brazil the technical bases for building inspection — the systematic evaluation of physical, functional and technical characteristics of buildings, aiming to identify pathological manifestations, risk conditions and the need for maintenance. This standard marked a turning point in how buildings should be monitored throughout their useful life.
The standard defines what building inspection is, who can conduct it, what the report must contain, and how anomalies should be classified. The classification system is particularly useful because it organizes findings by severity, urgency, evolution trend and impact on safety, functionality and conservation. This allows condominium managers, owners and administrators to prioritize actions with technical criteria.
For the inspection to be valid technically and legally, it must be signed by a qualified engineer. NBR 16747 reinforces this requirement and establishes that the professional must have technical knowledge of pathologies, building systems and applicable standards. This is not just bureaucracy: it is what guarantees the reliability of the inspection document.
In my practice, I have seen the adoption of NBR 16747 gradually improve building management quality in the regions where I work. Condominiums that implement periodic inspections detect problems earlier, spend less on corrective maintenance and have better legal protection for their administrators. The standard is not just a technical requirement — it is a practical tool for keeping buildings safe and well-managed.
Precautionary Neighborhood Survey: protect your construction before it even begins
I start this article with a recommendation that I always give to construction companies and developers: before the first machine moves on your site, inspect the neighbors. Document the current state of all adjacent buildings — their cracks, settlements, humidity, existing damages. This precaution, called a precautionary neighborhood survey, is the most effective preventive protection a construction has against damage claims.
The logic is simple: without this documentation, if a neighbor claims that your construction caused damage to their property, you will have difficulty demonstrating that the crack existed before your works began. With the survey, the evidence is documented, dated and technically signed. The burden of proof shifts significantly.
The precautionary survey must be conducted by a qualified civil engineer, with complete photographic record, technical descriptions, measurements of existing cracks and conditions of all visible elements — floors, walls, ceilings, stairs, facades. The report must clearly establish the date of the inspection and identify each surveyed property.
The ideal time is before any earthwork, demolition or activity that generates vibration or movement in the ground. Once works begin, the opportunity to establish the reference state is lost. I have conducted surveys the day before works began — and this timing was exactly what protected the client from an unfounded claim filed two months later. Time, in this case, literally meant money.
Building Inspection: the check-up every building needs
I often use a medical analogy to explain building inspection: just as a person has periodic health check-ups — even when they feel well — a building must also be periodically evaluated by qualified professionals. Buildings age, degrade, accumulate stresses and develop pathological problems that, when detected early, are easily and cheaply corrected.
Building inspection is this periodic check-up. It evaluates structural systems, foundations, facades, roofs, hydraulic and electrical installations, waterproofing, fire protection and all elements that affect the building's safety, performance and durability. The result is a technical report that classifies each finding by risk and recommends the appropriate maintenance or repair action.
Under NBR 16747, building inspection should be planned according to the building's age, use, state of conservation, maintenance history, system criticality and the technical recommendations in the report. New buildings may also benefit from early inspection, while older buildings or those with previous anomalies often require closer monitoring.
The building inspection report also serves as documentation for the condominium administrator. In case of damage claims by residents or neighbors, the inspection history demonstrates that the building has been monitored and that identified problems have been treated. This documentation can be decisive in determining responsibility in judicial proceedings. Building inspection is not an expense — it is risk management.
Building Pathology: the symptom is not the problem
I begin this blog with the concept that I consider fundamental for everyone who deals with civil construction — whether as an owner, manager, lawyer or engineer. Building pathology is the area of engineering that studies the diseases of constructions: their origins, their manifestations, their consequences and their treatments. And the first lesson of pathology is: the symptom is not the problem.
When a crack appears in a wall, when a ceiling stain shows up after rain, when a ceramic tile detaches on the facade — these are symptoms. They are the building's way of communicating that something is wrong. But where the symptom appears is not necessarily where the problem is. Water that stains the ceiling of the third floor apartment may enter through the roof slab on the fifth. The crack in the masonry may be the result of differential foundation settlement that happened months or years ago.
This is why building pathology requires a technical reading that goes beyond the visual. An engineer trained in pathology knows that he must investigate origins, not just describe manifestations. He asks: where is the water coming from? What mechanism generated this deformation? What combination of factors — design, execution, materials, maintenance — contributed to this pathology appearing?
Throughout this blog I will share practical knowledge about the most common pathologies, about technical standards guiding this work, about expert testimony in construction disputes and about preventive tools that every building should use. The goal is to make this technical knowledge accessible and useful — because understanding how buildings work and get sick is the first step to treating them well.
