No, it is never normal for a residential roof to leak during heavy rainstorms, regardless of how intense the downpour or wind-velocity may be. A properly installed and well-maintained roofing system featuring intact shingles, functioning underlayment, sealed flashing joints, and clear gutters is engineered to completely shed high volumes of water safely away from the home structure. If water manages to penetrate the interior during heavy rain, it signifies a localized failure, such as compromised flashing around a chimney, cracked roof valleys, missing shingle tabs, or clogged gutters forcing water backward under the eaves. You can troubleshoot heavy rain leaks safely by inspecting attic spaces with a flashlight during storms. You can verify that your corrective action is successful when clearing blocked drainage channels, sealing flashing gaps, and repairing damaged roof materials ensures your home remains entirely dry during future heavy downpours.
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