Which description most accurately reflects proper maintenance of thermoset membranes?

The correct choice highlights the importance of ensuring that new fasteners are installed with a repair patch that extends 3 inches beyond the fastener plate. This extended patch provides adequate coverage and support, preventing water infiltration around the fastener, which is critical for maintaining the integrity of a thermoset membrane roofing system. Properly sealing around the fasteners helps to protect against damage caused by moisture and environmental factors, thus prolonging the life of the roofing system and reducing the likelihood of leaks.

In contrast, leaving fasteners unsealed can allow moisture to penetrate, which compromises the roofing system’s effectiveness. Conducting all repairs in cooler temperatures is typically not a standard requirement for thermoset membranes, as flexibility and material characteristics can vary with temperature, possibly affecting the quality of the repair. Similarly, patches that are the same size as the fastener plate may not provide adequate overlap and protection compared to a larger patch, which is vital for ensuring a reliable seal.