What is another name for roofing felt in the context of roofing applications?

Roofing felt is commonly referred to as underlayment in roofing applications. Underlayment serves as a protective layer that is installed beneath roofing materials, such as shingles, to provide an additional barrier against water infiltration. It helps to prevent leaks and offers a layer of protection from the elements, particularly in the event of wind-driven rain or ice damming.

Although terms like tar paper and vapor barrier relate to roofing, roofing felt specifically aligns with the designation of underlayment because it functions as a structural component in the assembly of the roofing system. Tar paper is often an older term for roofing felt, and while they are similar in purpose, the term underlayment is the more widely accepted and used term in modern roofing practices. Vapor barriers are specifically designed to prevent moisture vapor from passing through, but they are not synonymous with roofing felt, which has a different primary function. Lastly, an ice shield is a specialized type of underlayment designed for areas prone to ice dams, but it is not a generic term for roofing felt.

Overall, recognizing roofing felt as underlayment underscores its essential role in enhancing the durability and effectiveness of roofing systems.