Most commercial roof failures in Texas begin quietly, during the first sustained stretch of early summer heat. In San Antonio, June marks a critical turning point for commercial roofing systems. Temperatures rise sharply, storms become more unpredictable, and existing weaknesses in flat roofing systems start to show. At Norwest Roofing, we see the same pattern in roofs that survived spring storms begin failing under thermal stress, drainage strain, and deferred maintenance issues. Let’s take a look at common causes for failing roofs in early summer in San Antonio.