: Pipes running through unheated crawl spaces, attics, or exterior walls are highly susceptible to ambient cold.
: Place a safe space heater in the room or crawl space where the pipe is located to raise the ambient temperature. drain freeze
This is the most common DIY method for sinks and bathtubs. : Pipes running through unheated crawl spaces, attics,
This is a long-term solution used for thawing and prevention. drain freeze