What is a critical condition that must be avoided regarding moisture on flat roofs?

Moisture retention on flat roofs is a critical condition that must be avoided because it can lead to a host of structural and material issues. When moisture accumulates and does not evaporate, it can compromise the integrity of the roofing materials, leading to deterioration, mold growth, and ultimately, roof failure. In flat roof designs, where proper drainage is crucial, moisture retention can create weak points and exacerbate structural problems over time.

Proper design, installation, and maintenance practices must be employed to promote effective drainage and minimize the risk of moisture retention. This includes ensuring adequate slope, regular inspections, and maintenance of drainage systems to prevent water from accumulating. By addressing moisture retention effectively, the lifespan and performance of the flat roof can be significantly improved, avoiding costly repairs or replacements in the future.