Definition
A self-sealing waterproof membrane applied along eaves, valleys, and penetrations. In Rochester's freeze-thaw climate it's the key defense against ice-dam leaks.
Why this term matters for homeowners
In Greater Rochester, roofing terms usually connect to material grade, freeze-thaw and ice-dam risk, and whether repair or replacement is the smarter long-term spend.
- Use this term to ask better follow-up questions during estimates.
- Look for this language in Learn and Evaluate guides to connect definition to decisions.
- Confirm how this applies to your specific roof age, pitch, and home layout.
Related pages
Category: Roofing