Building Enclosure Commissioning (BECx)

Building enclosure commissioning (BECx) helps project teams optimize performance requirements, reduce risk and long-term cost, increase quality assurance, and support resilient, high-performing buildings. 

Thornton Tomasetti provides BECx services for full enclosure systems: façades, roofs, and above- and below-grade waterproofing. From predesign through construction, turnover, and the warranty period, we help owners, developers, architects, contractors, and general contractors align enclosure design and construction with the project’s performance requirements. 

Our BECx services may be engaged as a standalone commissioning scope, in parallel with façade/envelope consulting, or as part of a broader LEED, sustainability, or resilience strategy.

Building Enclosure Commissioning Led by Design and Engineering

A building enclosure is an integrated system. Façades, glazing, roofing, waterproofing, insulation, air and vapor barriers, drainage, and structural interfaces must work together to manage water, air, heat, vapor, and movement over the life of a building. 

Thornton Tomasetti brings the independent perspective of a commissioning provider together with the technical depth of a multidisciplinary design and engineering firm. Our certified BECx teams draw on expertise in façade engineering, renewal, sustainability, resilience, forensics, construction engineering, and applied science to evaluate how enclosure decisions affect design intent, constructability, maintenance, and long-term performance. 

We understand not only how to review an enclosure, but the full life cycle of a building: how it is designed, detailed, installed, tested, operated, repaired, and renewed.

Our Building Enclosure Commissioning Process 

Our scope is tailored to the project’s size, complexity, procurement approach, and performance objectives. Services may include:

Predesign and Design 

• Assistance developing the Owner’s Project Requirements and reviewing the Basis of Design to define Owner’s Project Requirements for durability, energy performance, moisture control, resiliency, and operation.
• Independent peer review of façade, roofing, waterproofing, and enclosure documents. 
• Evaluation of system interfaces, detailing, constructability, and performance risks. 
• Development of BECx plans, specifications, and testing requirements. 
• Recommendations for mock-ups, laboratory testing, and field testing. 
• Early feasibility assessments for LEED and building enclosure commissioning readiness. 

Preconstruction and Construction

• Review of enclosure-related submittals and shop drawings. 
• Coordination with project teams and enclosure subcontractors. 
• Observation of visual and performance mock-ups. 
• Site observations of installed enclosure assemblies and interfaces. 
• Observation of field testing and recommended remedial testing as required. 
• Ongoing documentation of commissioning activities, field observations, findings, and resolution status. 

Turnover and Warranty 

• Final commissioning reporting and closeout documentation. 
• Review of maintenance and operating information related to enclosure systems. 
• Support during warranty-phase on-site reviews and follow-up evaluations, as appropriate.

Supporting LEED, Sustainability and Long-Term Asset Performance 

Building enclosure commissioning can support project teams pursuing applicable LEED commissioning pathways, including enhanced commissioning goals that require early coordination, clearly defined requirements, and independent review. Our sustainability specialists collaborate with the BECx team to help align enclosure commissioning activities with the project’s selected certification and documentation strategy. 

For owners assessing LEED v5, local energy-performance requirements, or broader decarbonization objectives, an early feasibility assessment can clarify the likely commissioning scope, enclosure-performance priorities, testing needs, and project-team responsibilities. This allows teams to make informed decisions before requirements become embedded in design and construction documents.

A Collaborative, Independent Perspective 

We work with owners and developers seeking confidence in long-term building performance; architects and designers seeking an independent enclosure review; and contractors and general contractors seeking clear, coordinated performance and testing requirements. 

Our approach is collaborative and hands-on. We look beyond isolated components to understand how the full enclosure should perform, where risks may occur, and how design intent can be carried through construction and into operation.