What is the purpose of ice-dam protection membranes?

The purpose of ice-dam protection membranes is primarily to prevent water leaks, which is crucial in areas prone to ice dams. These membranes are installed on roofs to create a waterproof barrier that prevents the infiltration of water caused by melting snow that refreezes at the eaves, typically when warm air from the home heats the roof and causes melting. As this meltwater runs down to the colder eaves, it can freeze and create an ice dam, obstructing additional meltwater, which can then back up under shingles and into the home, resulting in leaks.

While other options suggest benefits like insulation enhancement, ice accumulation prevention, or wind lift reduction, these are not the main functions of ice-dam protection membranes. Their key role is acting as a safeguard against water intrusion, ensuring that the interior of the home remains dry and free from damage that can occur due to ice damming.