Heat and UV: shingles cooked from both sides
Summer afternoons across middle Georgia regularly top 90°F, and the U.S. Department of Energy notes that a conventional dark roof in full sun can reach 150°F or more. Without enough intake at the soffits and exhaust at the ridge, that heat builds in the attic and bakes the shingles from underneath as well as from above.
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The results are blistering, early granule loss, brittle shingles and a cooling bill that climbs every July. UV also cracks rubber pipe boots and dries out sealant long before the shingles give up. On every inspection we check the ventilation balance and the boots, not just the shingle surface.
