Ice shields are required when using which roofing material at an average daily temperature of 25°F?

Ice shields are particularly required when using composite shingles in colder climates, especially where average daily temperatures can drop to 25°F. This requirement is based on the fact that composite shingles can be susceptible to ice dam formation, which occurs when warm air from the home melts snow on the roof, causing it to run down and re-freeze at the eaves where temperatures are colder. The ice shields act as a protective layer that prevents water from penetrating the roof system if ice dams do form.

While other roofing materials can also be affected by ice dams, composite shingles are more widely utilized in regions subject to cold weather and require these additional protective measures to ensure that leaks do not develop beneath the shingles during winter months. Typically, materials such as tile roofing and metal roofing have less susceptibility to ice dams due to their designs and materials, thus not necessitating the use of ice shields under the same conditions.