One of the primary reasons for wrapping aluminum foil around bathroom drain pipes is to deter rodents. Mice and rats often find their way into homes through gaps and openings around plumbing. These pests are excellent climbers and can squeeze through very small spaces. The shiny, reflective surface of aluminum foil can confuse and disorient rodents, making it an effective deterrent. Additionally, the texture and noise of aluminum foil are unappealing to them, reducing the likelihood of them attempting to chew through it.

Aluminum foil is an excellent insulator. By wrapping it around pipes, you can help maintain the temperature of the water inside, whether it’s hot or cold. This can be particularly useful in preventing pipes from freezing in colder climates. The foil helps to reflect heat back onto the pipe, providing an extra layer of protection against the cold.

Aluminum foil can also act as a moisture barrier. Bathrooms are prone to high humidity levels, which can lead to condensation forming on pipes. Over time, this can cause corrosion and rust, especially on metal pipes. Wrapping the pipes in aluminum foil helps to minimize condensation by reflecting heat and preventing moisture from settling directly on the pipe surface.