According to the NRCA Roofing Manual, how often should a termination bar be fastened on single-ply base flashings?

The correct answer is based on the guidelines provided in the NRCA Roofing Manual, which states that a termination bar should be fastened at intervals of every 6 inches on single-ply base flashings. This fastening approach is crucial because it ensures that the termination bar is securely attached, preventing wind uplift and potential water infiltration. When installed at this interval, the bar provides adequate support, creates effective tension across the base flashing, and helps to maintain the overall integrity of the roofing system.

Fastening the termination bar too far apart could lead to areas where the base flashing is not adequately adhered, increasing the risk of failures. Conversely, fastening it too closely does not usually provide additional benefits and may complicate installation without practical advantage. Therefore, adhering to the recommended 6-inch spacing strikes a balance between structural integrity and practical installation.