On which roof systems can a pull test be performed?

• A. All roof types
• B. Only on fully adhered BUR or mod bit
• C. Only on single-ply roofing systems
• D. On metal roofs only

Answer: (B)

A pull test is a specific procedure used to evaluate the adhesion of roofing materials to the substrate beneath. This test helps determine if the roofing materials are properly adhered and capable of withstanding environmental stressors.

The correct answer indicates that a pull test can be performed on fully adhered built-up roofing (BUR) or modified bitumen (mod bit) systems. These roof types are designed to have an adhesive bond that may be tested using pull tests. For fully adhered systems, the integrity of the bond is crucial for ensuring the roof's water-shedding capabilities and its overall performance. Therefore, conducting a pull test on these systems provides valuable insights into their adhesion strength and longevity.

Other options suggest the pull test applies to all roof types, single-ply roofing systems, or metal roofs only. However, pull tests are not universally applicable to all roofing types or configurations, such as mechanically fastened systems or roofs that use different bonding methods where this test would not accurately assess adhesion. Each roofing system has its own set of evaluation methods and requirements, making the fully adhered BUR and mod bit systems the focus for pull testing.