What is a primary consideration when designing a roof to support energy efficiency?

Utilizing reflective coatings is a primary consideration in roof design aimed at enhancing energy efficiency. Reflective coatings, often referred to as cool roof coatings, are specifically designed to reflect more sunlight and absorb less heat compared to standard roofing materials. By reflecting solar radiation, these coatings can significantly lower a building's temperature, which in turn reduces air conditioning costs and overall energy consumption. This is particularly beneficial in warmer climates where cooling costs can be substantial.

In contrast, other options may not prioritize energy efficiency. While choosing lower-cost materials could save money upfront, it may not provide the performance necessary for energy efficiency. Increasing roof slope can aid in drainage but doesn't necessarily correlate with improved energy performance. Similarly, using dark-colored shingles can contribute to heat absorption, leading to higher cooling loads and energy usage, making this option counterproductive in the context of energy-efficient roofing.