To stop a cold water supply pipe from forming condensation and dripping, you must isolate the pipe from warm ambient air by wrapping it entirely in closed-cell polyethylene foam insulation sleeves. Secure the insulation seams tightly with waterproof duct tape or contact adhesive so no gaps remain. Furthermore, if the pipe is located in a damp basement or crawlspace, running a continuous dehumidifier will significantly reduce the airborne humidity driving the condensation process. Verification: Check the insulation surface regularly to ensure it remains completely dry.
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