To stop copper water supply pipes from sweating and dripping water in humid weather, you must install closed-cell foam pipe insulation sleeves or self-sealing polyethylene pipe wrap tape. This creates an effective thermal barrier that stops warm, humid indoor air from touching the chilled pipe surface. Ensure all longitudinal slits and joints are tightly sealed with waterproof tape to prevent air infiltration. Additionally, running a dehumidifier lowers ambient humidity. Verification: Inspect the insulated pipes after installation to confirm zero moisture collection.
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