Authored by Robert J. Dinjar, P.E., Structural Technical Director, Technical Services
Published June 12, 2026.
Case Study Overview
Before a new K-12 school broke ground in Texas, an independent, third-party review of the building’s water, air, and thermal barrier design was required. The review identified critical gaps in the construction documents and provided actionable recommendations that protected the project, the owner, and the building’s future occupants.
|
SERVICE LINE |
FACILITY TYPE |
LOCATION |
REVIEW PHASE |
|---|---|---|---|
|
Third-Party Design Review |
K-12 School |
San Antonio, Texas |
Pre-Construction (Design Documents) |
|
3 |
PRE-CONSTRUCTION |
K-12 |
100% |
|---|---|---|---|
|
Building enclosure systems reviewed: water, air, and thermal |
Issues caught before any work began on site |
School facility: occupant health, comfort, and durability at stake |
All comments delivered with specific, actionable guidance for the Designer of Record |
The Challenge: Catching Design Oversights Before Construction Begins
Building a new school is a significant construction project for the community it serves. Unlike commercial or residential buildings, a K-12 facility is designed for decades of continuous use by children and educators. It is essential for the building envelope system to protect this population from poor indoor air quality, moisture intrusion, and thermal discomfort.
The project team constructing a school campus in San Antonio, Texas, understood and emphasized this requirement. As the project approached the construction phase, the architect of record engaged the Rimkus Built Environment Solutions (BES) team to conduct an independent, third-party review of the building’s water, air, and thermal barrier design.
Our experts’ goal was to identify any gaps, inconsistencies, or omissions in the construction design documents before work began on the job site. Finding issues to resolve before construction begins can lead to time and cost savings on the project, rather than delays and additional expenses later.
The core question: Do the construction documents provide sufficient detail and guidance on how the building’s water, air, and thermal barriers will perform as intended to protect the building and its occupants for the long term?
The Approach: Identifying the Mechanism, Not Just the Symptoms
Rimkus was retained to perform an independent review of the construction drawings and specifications, only for the building enclosure systems. This targeted review is not a full code compliance review; it is performance-focused evaluation grounded in building science, industry best practices, and field experience with how buildings actually behave under real-world conditions.
The review covered three interconnected systems that collectively define a building’s ability to resist the environment:
Water Barrier Systems
- Flashings, sill pans, fenestration details, roof drainage, crickets at scuppers, and the continuity of waterproofing across all penetrations and transitions
Air Barrier Systems
- The design’s ability to maintain a continuous, uninterrupted air control layer across all assemblies, details, and building transitions
Thermal Barrier Systems
- The placement and continuity of insulation, with particular attention to potential thermal bridging and inconsistencies between details
Our comments on each system’s components represented were sorted into two categories:
- Necessary revisions to reduce performance risk
- Recommended considerations to improve performance
To maximize efficiency and avoid redundancy, each unique condition was only marked once, with the understanding that the same comment applied to all similar conditions throughout the documents.
Key Findings: Pivotal Requirements and Recommendations
The Rimkus BES experts recognized a series of specific, actionable issues spanning all three enclosure systems and the supporting specifications. All identified issues were fairly common in complex construction documents, showing why independent reviews can add significant value. When a design team is deeply immersed in a project, it can be difficult to spot the gaps that an experienced reviewer can identify from an unbiased perspective.
|
System / Area |
Type |
Issue Identified |
Recommended Action |
|---|---|---|---|
|
Water barrier: sill pans, window flashings, and drainage |
Recommended |
Sill pan drainage, weep spacing, and flashing details were unspecified or incomplete, creating risk of water infiltration at fenestration. |
Specify sill pan type, integral back dams, drainage slopes, weep locations, and continuous coating on exposed flat concrete. |
|
Water barrier: roof drainage (crickets and scuppers) |
Recommended |
No slope specified for crickets at scuppers; tapered insulation slope not doubled at crickets and saddles per NRCA best practice. |
Specify cricket locations, slopes, and saddle insulation at minimum 1/2:12 (twice the field slope of 1/4:12) per NRCA guidance. |
|
Air barrier: continuity across details |
Required |
Air barrier continuity was not confirmed across all details, leaving potential gaps in the building’s air control layer. |
Ensure air barrier is continuous and fully detailed across all assemblies and transitions. |
|
Thermal barrier: continuous insulation consistency |
Required |
Inconsistency between details: some showed continuous insulation behind concrete tilt panels; others showed only wall sheathing. |
DOR to align all details to consistently indicate a continuous thermal barrier behind tilt panels. |
|
Specifications: mockups and quality control |
Recommended |
Mockup requirements referenced in specs but not indicated on drawings; no specific QA/QC or field performance testing protocols defined. |
Add mockup locations to drawings; specify required inspections, QA/QC procedures, and field performance testing protocols. |
|
Specifications: sealant joint field testing |
Recommended |
No hand pull-tab field testing protocol specified for installed sealant joints — a standard building enclosure quality assurance practice. |
Specify testing frequency (10 tests per first 1,000 LF, then 1 per 1,000 LF), documentation requirements, repair obligations, and escalation protocol for failures. |
|
Specifications — foundation drainage |
Required |
No specification section or drawing detail addressing foundation drainage was included in the construction documents. |
Provide dedicated specification section and supporting drawings for foundation drainage design. |
One finding proved the importance of adhering to quality assurance processes. The documents referenced mockup requirements in the specifications, but did not locate or define them on the drawings. Without the ability to utilize mock-ups during construction, the contractors would have had no clear guidance on what needs to be built and where. This could have led to inconsistencies throughout the project.
Similarly, the absence of a sealant field testing protocol meant there was no structured mechanism in place for verifying that a critical water-shedding system had been installed correctly before the building was closed up.
“The best time to find a problem in a building’s design is before a single component has been installed. Third-party review turns potential field failures into document corrections.” – Robert J. Dinjar, P.E., Structural Technical Director, Technical Services
The Value Delivered: Prevention is the Most Cost-Effective Form of Building Performance
The fundamental value of a pre-construction building enclosure review is both economic and technical. Industry research shows that the cost of correcting a design issue during the drawing and specification phase is a fraction of the cost of correcting the same issue during construction, including building envelope remediation.
For this case study, the Rimkus BES team’s review delivered value across the project scope.
|
Risk Eliminated at the Source |
Design Accountability |
Occupant Protection |
|
Every issue identified was flagged before construction began — when corrections cost a fraction of what they would cost to fix after the building is enclosed. |
Clear, categorized comments gave the Designer of Record specific, actionable guidance — not vague concerns — enabling targeted revisions to drawings and specifications. |
For a K-12 school, building enclosure performance directly affects indoor air quality, thermal comfort, and the long-term health of the learning environment. Getting it right at design stage protects students and staff for decades. |
|
Codes and Standards Alignment |
Quality Assurance |
Long-Term Cost Savings |
|
Rimkus identified gaps relative to NRCA best practices and ANSI/SPRI standards, ensuring the design would meet or exceed recognized industry requirements before construction commenced. |
Recommending sealant field testing protocols and mockup specifications embedded QA/QC into the construction process itself — not as an afterthought, but as a designed-in safeguard. |
Building envelope failures are among the most disruptive and expensive remediation projects a facility owner can face. Catching these gaps at design stage avoids future water damage, mold risk, and energy loss at their root cause. |
Why Third-Party Building Enclosure Review Matters
Building enclosure failures are among the most common and costly problems facing facility owners — and they are almost always preventable. Moisture that finds its way through an undetailed sill pan, air that bypasses a discontinuous barrier, or heat that bleeds through a thermal bridge in an uninsulated wall assembly: these are not dramatic failures. They are slow, cumulative, and often invisible until significant damage has occurred.
Third-party review works because it introduces an independent perspective trained specifically in building science and enclosure performance. The Rimkus BES team is experienced investigating how buildings fail in the real world, and uses that knowledge to read construction documents not just for what they say, but for what they leave unsaid. An omitted detail, an unspecified drainage slope, an inconsistent insulation strategy: these are the kinds of issues that pass through internal review cycles undetected and become field problems.
For public and institutional facilities like schools, the stakes are especially high. A building envelope that underperforms creates maintenance costs and repair bills, but it also creates uncomfortable, unhealthy learning environments that affect students and staff every day the building is in use.
Key Takeaway
The building enclosure review transformed a set of construction documents containing performance gaps into a clearer, complete set of instructions, giving the design team, contractor, and owner the confidence that the building would be built to perform as intended.
Why Choose Rimkus Built Environment Solutions?
Rimkus provides third-party building enclosure design reviews that identify performance risks before they become construction problems — protecting your project, your budget, and your building’s occupants from day one.
This case study reflects the building enclosure consulting capabilities of our Built Environment Solutions team:
- Third-Party Building Enclosure Design Review
- Water Barrier System Evaluation (Flashings, Sill Pans, Fenestration, Roof Drainage)
- Air Barrier Continuity Review
- Thermal Barrier and Continuous Insulation Assessment
- Construction Document (Drawings and Specifications) Review
- Quality Assurance and Mockup Protocol Recommendations
- Sealant Joint Field Testing Specification
- NRCA and ANSI/SPRI Standards Compliance Review
- Building Enclosure Commissioning (BECx) Support
- Pre-Construction Risk Reduction for Institutional Facilities
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Meet Our Texas Expert: Robert J. Dinjar, P.E.
Structural Technical Director, Technical Services
Built Environment Solutions, Texas
+1 512 492 2290
[email protected]
View Robert’s Expert Profile
Robert Dinjar specializes in preparing structural engineering designs, designing building lateral resistive systems, and the inspection and certification for high wind and flood compliance. He has experience working with a wide range of structures including commercial buildings, residences, retaining walls, and pools. Robert provides other built environment services such as remediation, construction defect evaluation, structural failure analysis, and storm and flood damage assessment.
This case study is intended to provide general information and insights into prevailing industry practices. It is not intended to constitute, and should not be relied upon as, legal, technical, or professional advice. The content does not replace consultation with a qualified expert or professional regarding the specific facts and circumstances of any particular matter.