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WindowWrap® Flex is a flexible, self-adhering waterproofing tape designed for curved window or door openings, as well as sealing building joints.

With proper application, WindowWrap® Flex will prevent water leaks, air and insect infiltration, and reduce noise. WindowWrap® Flex is a self adhered membrane consisting of a rubberized asphalt adhesive which is laminated to cross-laminated polyethylene crepe film. The crepe film allows WindowWrap® Flex to be stretched around arched windows, doorways and other popular curved shapes.

  • Cross-laminated polyethylene crepe film allows exceptional stretch and durability
  • Rubberized asphalt adhesive remains flexible over a wide temperature range
  • Adheres aggressively to plywood, OSB, masonry, aluminum, rigid vinyl, steel, drywall and house wrap
  • Impermeable to water vapor, moisture, insects and air
  • Self-seals around nails and other mechanical fasteners
  • Easy to remove release liner for quick installation
  • May be left exposed for 90 days

WindowWrap® Flex has many intended uses including:

  • Beneath exterior siding as a backup waterproofing system
  • To flash windows and doors in new or remodeling construction
  • To seal joints, vents and other exterior openings
  • Conforms to arched and curved windows and doorways
  • May replace kraft paper, metal flashing, foam sealants, house wrap and tapes where extra protection is needed

WindowWrap® Flex comes in individually packaged rolls and offers a 10-Year Limited Warranty.

WindowWrap® is protected by US Patent Nos. 6,479,119 and 6,627,017.

WindowWrap® Flex

ProductProduct IDSizeUnits/CartonCarton Wt.
WindowWrap Flex45WF1212” x 50’352 lbs
45WF099” x 50’452 lbs
45WF066” x 50’652 lbs
45WF044” x 50’952 lbs

WindowWrap® Flex 12” and 4” are one pallet minimum order products.

MFM WindowWrap® Flex

Roll Sizes: 6", 9" x 50'