WEATHERMATE™ Straight Flashing

Flashing combines a blue high-density polyethylene (HDPE) film facer with a butyl rubber adhesive to form a strong mechanical and chemical bond to most building materials in residential and commercial applications.

Used In

  • Seal around windows, doors and penetrations in residential applications
  • Part of the THERMAX™ Wall System for steel stud cavity walls in commercial building applications
  • Temporary flashing over insulation joints on standing seam metal roofs

Product Advantages

  • Can be applied in temperatures as low as 30°F (-1°C)
  • Combines blue high-density polyethylene (HDPE) film facer with a butyl rubber adhesive that forms a strong mechanical and chemical bond to most building materials
  • Polymeric-coated paper release liner for a more consistent peel than plain paper liners
  • Available in 4" (100 mm), 6" (150 mm) and 9" (230 mm) widths on 100' (30.5 m) rolls

Typical Physical Properties

These properties are typical but do not constitute specifications.


Property Value
Water Vapor Permeance, ASTM E96, perm ≤1
Application Temperature, oF (oC) min. 30(-1)
UV Resistance, days 120
Thickness, ASTM D3767, Method A, mil 20
Size 4" x 100' (100 mm x 30.5 m)
6" x 100' (150 mm x 30.5 m)
9" x 100' (225 mm x 30.5 m)

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