The weakest points of a residential roof are typically its valleys, flashing points, roof penetrations (such as plumbing vents, skylights, and chimneys), and eaves. These critical junctions are highly prone to water pooling, ice damming, and severe thermal expansion stresses that compromise waterproof seals. Without meticulous flashing installation and robust underlayment protection, these vulnerable structural areas are almost always the first locations where leaks, wood rot, and structural moisture damage develop.
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