Built for Real-World Forces — Not Just Standards
Functional Performance Testing (FPT) verifies building enclosure performance under controlled, measurable conditions. By integrating dynamic testing, we simulate real environmental forces—wind, pressure fluctuation, and wind-driven rain—to identify vulnerabilities that static testing alone may not uncover.
Why Traditional Testing Isn't Enough
Industry standards and laboratory testing provide important baseline information, but buildings do not experience wind and water under static, uniform conditions. In the field, fluctuating pressures, shifting wind directions, and wind-driven rain often expose vulnerabilities that standardized testing alone cannot reveal.
Dynamic testing is designed to evaluate performance under these real-world forces.
Industry standards and laboratory testing are essential for evaluating building envelope performance. Static pressure chamber tests, mockups, and component-level evaluations provide valuable baseline data and verification of code compliance.
However, buildings do not experience wind and water in static, uniform conditions.
In the field, exterior assemblies are subjected to fluctuating pressures, shifting wind directions, and wind-driven rain that interacts with geometry, detailing, and installation quality in ways laboratory testing cannot fully replicate. These real-world forces often expose vulnerabilities that go undetected in testing limited to steady-state conditions.
This gap between standardized testing and actual performance is where failures occur—not because systems were untested, but because they were never tested under conditions that reflect how the building will truly be loaded.
By introducing controlled variability in wind pressure and water delivery, dynamic testing enables evaluation of enclosure performance under conditions that more closely mirror real environmental exposure. This approach provides insight into how assemblies respond as systems rather than as isolated components.
Benefits of Functional Performance Testing
Functional Performance Testing (FPT) provides objective, field-based verification of building enclosure performance. By evaluating how assemblies respond to air, water, and thermal loads—and, when appropriate, dynamic wind and water exposure—FPT helps identify vulnerabilities early and supports informed decisions that reduce long-term risk.
Code & Standards Compliance
Verifies enclosure performance against applicable ASTM, AAMA, and other industry standards, helping reduce liability and support defensible decision-making.
Improved Building Longevity
Confirms that enclosure systems perform as intended, reducing the likelihood of premature deterioration, maintenance issues, and unexpected repairs.
Energy Efficiency Optimization
Identifies air leakage and thermal performance issues that impact HVAC efficiency, energy use, and overall building performance.
Early Issue Detection
Reveals air and water intrusion paths, thermal inconsistencies, and installation-related deficiencies—before they escalate into costly failures.
Cost Savings & Risk Reduction
Reduces the potential for warranty claims, remediation costs, and disputes by validating enclosure performance under field conditions prior to project completion.
Enhanced Occupant Comfort & Indoor Air Quality
Helps prevent drafts, moisture intrusion, and condensation-related issues that can affect occupant comfort, durability, and indoor air quality.
How Functional Performance Testing Is Performed
Functional Performance Testing evaluates building enclosure performance using a combination of established field testing methods. Depending on project goals, scope, and risk profile, testing may include air infiltration testing, water penetration testing, thermal performance evaluation, and other applicable ASTM- and AAMA-based procedures.
These methods provide valuable insight into baseline performance, code compliance, and construction quality at the time of testing.
For projects where real-world exposure, system interaction, or performance risk is a concern, dynamic wind and water testing can be incorporated to evaluate how the enclosure responds under fluctuating pressures and wind-driven rain—conditions that static testing alone cannot fully replicate.
This flexible, project-specific approach allows Functional Performance Testing to be tailored to each building's needs, rather than applying a one-size-fits-all testing strategy.
Functional Performance Testing Methods
Functional Performance Testing employs a range of field-based testing methods to evaluate how building enclosure systems perform under environmental loads. The specific methods selected depend on project goals, enclosure complexity, and performance risk.
Dynamic Wind and Water Testing
Dynamic wind and water testing evaluates enclosure performance under fluctuating pressures and wind-driven rain that more closely reflect real environmental exposure.
BEPG uses proprietary, custom-built testing systems, including the Beast and the Mini-Beast, to generate controlled, repeatable wind and water conditions in the field. These systems allow enclosure assemblies to be evaluated under variable loading, helping identify air and water infiltration pathways, transition vulnerabilities, and installation-related deficiencies that may not be revealed through static testing alone.
Dynamic testing is typically incorporated into projects where real-world exposure, system interactions, or performance risk warrant a more rigorous evaluation.
Air Infiltration Testing
Air infiltration testing measures the effectiveness of air barrier systems, seals, and interfaces in limiting unintended air leakage through the building enclosure.
This testing helps identify leakage paths that can affect energy performance, occupant comfort, moisture control, and long-term durability.
Water Penetration Testing
Water penetration testing evaluates the ability of enclosure components and assemblies to resist water intrusion under applied pressure differentials.
Testing is commonly performed at windows, curtain walls, doors, and transitions to verify installation quality and confirm performance at critical interfaces.
Thermal Performance Testing
Thermal performance testing assesses insulation continuity and thermal barrier effectiveness to identify deficiencies that can contribute to energy loss or condensation risk.
Infrared thermography and related methods may be used to evaluate thermal performance under appropriate conditions.
Functional Performance Testing You Can Trust
We provide expert-driven functional performance testing that delivers accurate, reliable results, supports performance verification, and helps reduce risk across a wide range of building enclosure conditions.
When Should Functional Performance Testing Be Conducted?
When Dynamic Testing Makes Sense
Dynamic wind and water testing may be appropriate when a project involves higher performance risk, complex enclosure systems, or exposure conditions that are difficult to evaluate using static testing alone.
Dynamic testing is commonly considered for:
Dynamic testing is not necessary for every project. When appropriate, it is incorporated into a broader Functional Performance Testing strategy to provide targeted, project-specific insight.
Real-World Results: FPT in Action
Functional Performance Testing has helped our clients identify performance risks early and support long-term building enclosure performance. From high-rise developments to complex retrofit projects, our testing has identified air and water leakage issues, verified enclosure integrity, and optimized energy efficiency. Below are a few examples of how FPT made a measurable impact.
FAQ
If the systems look correct, why is testing necessary?
Visual review alone cannot confirm performance. Building enclosure systems may appear properly installed while still allowing air or water intrusion due to detailing, transitions, or installation-related issues that are not visible.
Functional Performance Testing verifies that systems operate as intended under applied conditions, helping identify vulnerabilities before they result in moisture intrusion, durability issues, or costly remediation.
How early in a project should Functional Performance Testing be considered?
Functional Performance Testing is most effective when considered early enough to influence decisions. While testing is often performed during construction or prior to occupancy, early coordination aligns testing strategies with project goals, risk tolerance, and enclosure complexity.
Early planning helps ensure testing provides actionable insight rather than reactive confirmation.
How does Functional Performance Testing support new construction projects?
Functional Performance Testing helps verify that enclosure systems are designed and installed to perform as intended before issues arise. Given the complexity of modern building enclosures—and the wide range of materials and assemblies used—testing provides objective confirmation that selected systems function together as a complete enclosure.
FPT supports informed decision-making during construction and helps reduce the risk of post-occupancy performance issues.
Is Functional Performance Testing required on every project?
No. Functional Performance Testing is tailored to each project's needs based on risk, exposure, enclosure complexity, and performance goals.
In some cases, targeted testing is sufficient. In others, a broader or more rigorous testing approach—including dynamic testing—may be appropriate. BEPG works with project teams to determine the most effective testing strategy for each building.
What’s the difference between laboratory testing and field-based Functional Performance Testing?
Laboratory testing evaluates individual components or assemblies under controlled conditions, often prior to installation. Functional Performance Testing evaluates installed systems in the field, accounting for construction sequencing, detailing, transitions, and workmanship.
Both approaches serve important roles, but field-based testing provides insight into how the enclosure performs as a complete system.
Can Functional Performance Testing be phased or targeted to specific areas?
Yes. Functional Performance Testing does not have to be all-or-nothing. Testing can be targeted to specific assemblies, elevations, or high-risk details based on project priorities and observed conditions.
A phased or targeted approach is often used to balance performance goals, schedule, and budget considerations.
What types of fenestration and air barrier tests does BEPG perform?
BEPG performs a wide range of field-based fenestration and air barrier tests in accordance with applicable ASTM and AAMA standards. Testing methods may include air leakage, water penetration, structural performance, and diagnostic evaluations.
Commonly performed standards include (but are not limited to):
- ASTM E283 / E783 - Air leakage testing
- ASTM E779 / E1827 - Whole-building air leakage testing
- ASTM E331 / E547 / E1105 - Water penetration testing
- AAMA 501.1 / 501.2 - Dynamic and diagnostic water testing
- AAMA 502 / 503 / 511 - Field and forensic fenestration testing
- ASTM E1186 - Infrared and air leakage detection methods
Specific test selection depends on project conditions and objectives. Clients are encouraged to contact BEPG to discuss testing needs.
What types of roof system testing does BEPG perform?
BEPG conducts field testing of roof and waterproofing systems to evaluate performance, locate deficiencies, and verify installation quality.
Common roof system testing standards include:
- ASTM C1153 - Infrared detection of wet insulation
- ASTM D5957 - Flood testing of waterproofing systems
- ASTM D7877 - Electronic leak detection
- ANSI/SPRI FX-1 - Fastener withdrawal resistance testing
- ANSI/SPRI IA-1 - Uplift resistance of insulation assemblies
Testing methods are selected based on roof system type, project phase, and investigation goals.
Who typically engages BEPG for Functional Performance Testing?
Functional Performance Testing is commonly engaged by owners, commercial real estate developers, architects, contractors, and facility teams seeking objective, third-party evaluation of building enclosure performance.
BEPG collaborates with project teams to provide testing and interpretation that support informed decision-making.
