Stopping a leak around a chimney stack requires identifying where the water is entering and applying appropriate temporary or permanent fixes. First, inspect the chimney cap, crown, flashing, and masonry joints for cracks, gaps, or rust. If the chimney crown is cracked, you can fill minor fissures with an elastomeric concrete crack sealant or crown coat. For gaps in the metal flashing or counter-flashing, cleaning the area thoroughly and applying a thick layer of exterior-grade roofing cement or silicone sealant can provide an immediate waterproof barrier. If the flashing is severely rusted, warped, or improperly installed, applying sealant will only be a temporary band-aid, and you will need to hire a professional roofer to remove the old metal and install new step flashing and counter-flashing with integrated waterproof underlayment to permanently resolve the issue.
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