Water leaking around a residential exterior door or window during heavy rain is typically caused by clogged or damaged roof gutters overflowing and dumping water directly against the exterior wall, missing or degraded exterior weatherstripping around the door frame, a lack of a proper drip cap above the trim, or exterior flashing that has failed, allowing rainwater to track behind the siding and pool at the threshold. You can troubleshoot exterior leaks easily with a hose test. You can verify that your corrective action is successful when cleaning out roof gutters, replacing worn weatherstripping, and sealing exterior trim joints stops rainwater from penetrating your home threshold.
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