Which factor is the most useful indicator for deciding if a low-slope roofing system should be recovered or replaced?

The most useful indicator for deciding if a low-slope roofing system should be recovered or replaced is deck deflections and fungal growth in the roof membrane. This is because these factors provide critical insights into the structural integrity of the roofing system and its overall condition.

Deck deflections can indicate potential weaknesses in the roofing's support structure, which may lead to water pooling and additional damage over time. Even minor deflections can compromise the efficacy of a low-slope roof, leading to leaks and ultimately requiring replacement if not addressed.

Fungal growth, on the other hand, signifies moisture problems and can detrimentally affect the roofing materials, promoting further decay and loss of performance. The presence of fungi can lead to disintegration of the membrane and cause significant issues, such as leaks, which would warrant a thorough assessment to determine if recovery measures will suffice or if a full replacement is necessary.

While the age of the roof can offer some guidance, it does not provide the comprehensive view that structural integrity and material condition do. Owner’s preference may play a role in decision-making but is often less informed than the technical evaluation of the roof system’s condition. Weather exposure factors into the long-term durability of materials but does not directly assess the immediate conditions that could dictate recovery