What is the “Building Thermal Envelope” Condition of Approval in Clark County ?
This test is also referred to as Thermal Envelope Testing or Blower Door Testing. It is a Condition for Approval with the Clark County Building Department for many residential and commercial buildings. Building thermal envelope testing is a diagnostic tool used in building performance analysis to measure the airtightness of a building's envelope. The test involves temporarily installing a powerful fan in an exterior door frame, which is then used to pressurize or depressurize the building. By measuring the airflow required to maintain a specific pressure difference between the inside and outside of the building, technicians can determine the air leakage rate.
During the test, the technician closes all windows, doors, and other openings in the building except for the one with the blower door. The fan creates a pressure difference between the inside and outside of the building, causing air to flow through any leaks in the building envelope. The airflow rate is measured using a pressure gauge, and results are typically expressed in air changes per hour (ACH) or cubic feet per minute (CFM) at a standard pressure differential.
Blower door testing helps identify areas of air leakage in a building, which can lead to energy loss, discomfort due to drafts, and decreased indoor air quality. Once these areas are identified, they can be sealed to improve energy efficiency, comfort, and indoor air quality. Blower door testing is also used to verify the effectiveness of air sealing measures after they have been implemented.
To book your Building Thermal Envelope Test in Clark County and to learn more, please call us at (702) 376-9105.
To provide a quote, we will need the following:
Permit Number
Plans (email to Admin@EnergyAuditingCo.com)
Current Stage of Construction
Be sure to read our page on how to pass this test.