What is one method of testing the integrity of a BUR roof?

A moisture survey using infrared thermography is an effective method for testing the integrity of a Built-Up Roofing (BUR) system. This technique utilizes thermal imaging technology to detect temperature variations on the roof surface, which can indicate the presence of moisture within the roofing materials. When moisture infiltrates the roof system, it often leads to a different thermal signature compared to dry areas. This allows for the identification of possible leaks or saturated insulation without causing any damage to the roof.

In contrast, while visual inspections are important for identifying obvious issues such as surface damage or debris, they may not reveal hidden moisture problems. Excessive hammer tapping can provide some information about the substrate's condition but is not a reliable or systematic method for assessing a BUR roof's integrity. Finally, simply assessing a roof by its age does not accurately reflect its current condition or performance; roofs can deteriorate at different rates based on various factors, including exposure to elements and maintenance history. Thus, infrared thermography stands out as a sophisticated and non-invasive method for evaluating BUR roofs, making it the optimal choice for this question.