Building Enclosure Commissioning (BEC)

Building Enclosure Commissioning is a structured process aimed at ensuring the quality and performance of a building's exterior, including walls and roofs. This process is crucial for:

• Meeting the owner's requirements
• Avoiding construction issues
• Enhancing durability
• Reducing energy costs
• Mitigating indoor environmental risks

Process Overview

1. Establish Standards

   • The commissioning agent collaborates with the owner to set standards.
   • These standards are checked against the architect's drawings and contractor submittals.

2. Field Observations

   • The commissioning agent observes construction to ensure quality and compliance.

3. Testing Recommendations

   • Recommend appropriate tests for each building.

Testing Methods

Infrared Imaging and Enclosure Tightness Testing

• Infrared Imaging

  • Identifies deficiencies such as:
    • Thermal bridges
    • Insulation defects
    • Moisture accumulation
    • Air leakage

• Enclosure Tightness Testing (Blower Door Testing)

  • Measures building tightness by inducing pressures and taking airflow readings.
  • Compares airflow data to desired tightness levels.

Concurrent Testing

• Typically performed together to quantify air leakage and observe through infrared imaging.

Inspection Process

• Exterior Inspections: Identifies large anomalies and penetrations.
• Interior Inspections: Prepares for pressure testing, ensuring safety and accuracy.

Key Inspection Items

• Windows, mechanical equipment, exhaust fans, hazardous materials, etc.

Building Preparation

• Disable mechanical equipment and seal up intentional openings.
• Ensure quality control checks comply with ASTM standards.

Testing Procedure

• Equipment:

  • Uses a calibrated fan, manometers, and custom frames.
  • Control accuracy via laptops.

• Conditions:

  • Best performed in calm weather with minimal temperature difference.

Pressure Testing

• Depressurize the building while performing infrared scans.
• Use smoke wands to trace airflow paths when necessary.

Results Analysis

• Quantitative airflow testing determines leakage rate based on geometry.
• Compare results to project goals and standards.

Outcome

• Provide a detailed list of air leakage locations.
• Recommend corrective actions to enhance comfort, reduce energy waste, and improve maintenance issues.