Protecto Flex

Window & Door Sealing Tape For Curved & Radius Surfaces Forms a permanent waterproofing air/vapor seal around curved and radius doors and windows that prevents air and moisture leaks. Protecto Flex® is a 40-mil thick peel and stick flashing tape. The flexible cross-laminated top surface will expand and conform to irregular or curved surfaces while the aggressive adhesive forms a permanent bond between the window fin and the building substrate. Protecto Flex gives you a total air and water seal without having to cut and patch in the membrane to conform to irregular or curved window and door openings.


  • Expands and conforms to radius or curved window fins
  • Aggressive adhesive forms a permanent bond between the window fins and the building substrate
  • Easy to install peel and stick application
  • Self seals around nails, screws and staples
  • Adheres to plywood, OSB, vinyl, aluminum, metal, foam, Dens-Glass Gold®,* concrete and masonry surfaces
  • Protecto Flex may be left exposed up to 120 days
  • Backed by over 50 years of manufacturing expertise


  • Window and door perimeters to the building substrate
  • Joints in stucco applications
  • Sheet rock joints
  • Other areas where a water or air seal is needed

Click on link below to download sheet.