What condition must be maintained during the base pressure measurement?

During the base pressure measurement, it is essential to maintain winter conditions to ensure accurate readings that reflect the actual performance of the building. In winter conditions, the differences in temperature between the inside and outside of the building are more pronounced, which influences air infiltration and creates a larger pressure differential. This allows for a more reliable assessment of how well the building envelope is performing under typical cold weather scenarios.

In colder months, buildings usually experience higher rates of heat loss, and understanding how these conditions affect pressure is crucial for diagnosing potential issues related to air leakage and energy efficiency. Thus, measuring base pressure in a simulated winter environment provides valuable insights into the building’s performance and helps in identifying necessary improvements to maintain comfort and efficiency.