When shingles blow off your roof, it does not automatically mean your home will experience an immediate leak, but it significantly increases your vulnerability to water infiltration during the next rainfall. Beneath the outer layer of asphalt shingles lies a secondary waterproof barrier, typically consisting of heavy-duty felt paper, synthetic underlayment, or self-adhering ice and water shield adhered directly to the wooden roof decking. While this underlayment is designed to provide temporary protection against moisture, it is not meant to be permanently exposed to ultraviolet light and driving rain. If a severe storm blows off multiple shingles, the exposed underlayment can quickly degrade, tear, or fail, allowing water to seep through the nail holes and wood decking into your attic. Therefore, missing shingles should always be patched or replaced as quickly as possible.
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