Property owners, contractors, and even some developers often ask a fair question: “What value does an engineer or consultant bring to a restoration project?” It’s valid, especially when the cost of hiring an engineer doesn’t immediately reduce the project’s bottom line. In fact, in the short term, our involvement might feel like an added cost. However, the true value of engineering on façade restorations and replacements, parking garage rehabilitations, or roof replacements doesn’t lie in the money saved today, but the problems (and costs) of what is avoided in the future.
Take the images above—a seemingly minor detail from a residential home that is under construction near my house. ZIP System flashing tape is applied over a fully adhered Henry Blueskin VP100 air barrier. These two materials are probably compatible. But probably isn’t proof. The warranties from either manufacturer may not cover this condition, and there’s no third-party testing to confirm long-term performance of this specific assembly.
On a single-family house, you may never see the consequences, or the next owner in 10 years doesn’t know that the addition is only 10 years old and just does the repairs as needed. When that this situation translates to a 30-story building, things change dramatically. Granted, these exact systems would likely not be used on a 30 story building, but bear with us on the analogy, as there are similar systems that are often used interchangeably by some contractors and owners without thought to long term performance.
Without engineered oversight, these kinds of undocumented pairings are installed all the time—unwittingly baking in future failure. Now that we have highlighted it, you’ll likely start seeing it more and more. The reason behind it is rather simple, the construction industry often favors what’s available, fast, and familiar—not necessarily what’s proven.
At its core, engineering is the application of scientific method. When an engineer designs or reviews an assembly, we are ensuring that the materials are tested together in controlled settings—not just in separate lab trials. Assemblies are selected based on ASTM, AAMA, and ACI standards that confirm adhesion and compatibility, moisture intrusion resistance and structural integrity under real loads.
This approach means you’re not relying on tribal knowledge passed down from generation to generation or hearsay—you’re relying on data. Without this rigor, the industry is just trusting the hope that “they’re close enough in chemistry.” While we readily admit there are times and places to take these risks or use rules of thumb, they should be calculated and involve some level of analysis and thought before implementing.
Let’s put the risk in perspective:
- Mobilizing scaffolding or swing staging can cost $100,000 or more for a mid-rise building. We often find it can be half the project costs on projects less than $500,000.
- Accessing a parking garage deck post-occupancy can trigger fire watch fees, tenant complaints, or closures.
- Replacing a failed roof prematurely adds six figures of avoidable capital expenditure.
Hiring a consultant ensures a durable, field-validated, and warranty-compliant solution—protecting owners not just from rework costs, but from reputation risk, liability exposure, and tenant disruption.
Some say, “consultants are just there to make sure you get your warranty.” But warranties are often full of exclusions and come with complex procedures. Worse, if improper detailing voids them, they become meaningless.
Engineers aren’t here to tick a box. We’re here to help:
- Avoid premature failures that void coverage anyway
- Detail transitions that match field conditions—not just manufacturer illustrations
- Confirm materials match climate, exposure, and movement patterns
In short, we help you build smarter and more defensibly. Just because you get a 20 year warranty doesn’t mean you can’t have that system last much longer with proper detailing and maintenance.
Each restoration project brings a unique combination of existing conditions, building age, structural limitations, and environmental exposures. The wrong repair technique—even if it “looks right”—can accelerate deterioration. As noted in the ACI 546R-04 and 201.1R-08 guides, the symptoms (e.g., cracking or spalling) are often misdiagnosed, leading to misapplied repairs that don’t address root causes.
Our role is to understand the mechanism of deterioration—whether due to chloride ingress, freeze-thaw cycling, carbonation, or poor detailing—and prescribe durable, scientifically justified repairs.
Next time someone says, “We’ve always done it this way,” or “This will probably work,” ask yourself: would you accept “probably” from a surgeon, an airplane mechanic, or even your accountant?
Why would you accept it from your contractor?
Engineers don’t exist to slow projects down, although again we would readily admit some do unnecessarily, but rather we exist to safeguard your investment for the long haul.
Principal
Duffy Engineering
