Which of the following criteria is important for maximizing roof service life?

Minimizing ponding and limiting penetrations are crucial criteria for maximizing roof service life because both factors significantly impact the durability and performance of a roofing system. Ponding refers to the accumulation of water on the roof surface, which can lead to various problems, such as structural damage, increased wear and tear, and accelerated deterioration of roofing materials. If water is allowed to stagnate, it may seep into seams or joints, causing leaks and necessitating costly repairs.

Limiting penetrations in the roof also plays a vital role in preserving its longevity. Each penetration, such as those for vents, pipes, or skylights, creates potential weak points that can lead to water infiltration if not properly sealed and flashed. By minimizing these penetrations, the likelihood of leaks and subsequent damage is reduced, contributing to a longer service life for the roofing system.

In contrast, using the cheapest materials available may compromise the overall quality and durability of the roof. Similarly, installing as many layers as possible could add unnecessary weight and complexity, potentially leading to structural issues. Ignoring ventilation requirements can result in heat and moisture buildup, which adversely affects the roof's materials and structure. Hence, focusing on minimizing ponding and limiting penetrations is the best strategy for extending the service life