A blow-off is when wind lifts or removes roofing material, often exposing underlayment or decking.
Why It Matters
Even a small missing shingle area can allow water into the roof system if the exposed area is not protected.
Common Problems
Common causes include high wind, shingles that never sealed properly, fasteners placed incorrectly, brittle shingles, and poor edge details. Blow-offs can also happen when shingles have aged out and the factory sealant strip has lost its bond over time, making the roof more vulnerable to wind uplift.
Building Codes & Industry Standards
Roof coverings should be installed according to manufacturer wind-zone instructions, fastening patterns, and applicable building code requirements.
Exterior Echelon Notes
Exterior Echelon checks blow-off areas for both immediate water exposure and underlying installation or age-related factors.
