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BackerBead® Drip Flashing - 3-1/2" Flange

Drip flashing with built-in closed cell backer rod

BackerBead® Drip Flashing - 3-1/2" Flange is designed to provide positive drainage above exterior window and door openings while also providing a caulk tray at the top of window and door frames for the proper seal and added moisture protection.

Application(s): Stone Veneer, Stucco

Eliminates the need to install a backer rod separately, as the product features a factory-applied backer rod that is affixed to the vinyl Drip Flange and set for accurate jointing. This accessory allows the installer to create a “gap” on the wall without the hassle of aligning it in the field, thereby saving time and materials.  The Drip Flange is recommended over window, door heads, short roof flashing, or underneath stone for a brick-ledge condition.  Punched holes near top of attachment flange facilitates easy fastening.

Features / Benefits:

  • Combination Bead - Reduces steps in the field installation of Drip Flashing and separate backer rod. Ensures backer rod is installed around all door and window openings.
  • Improved Quality - Factory-applied blue backer rod with preset width and depth to ensure proper caulk gap for sealant application. When the gap is properly caulked, the blue backer rod will no longer be visible.
  • Separation of Dissimilar Materials - Properly terminates stucco and mortar at window and door frames. (ASTM C926)
  • Sealant Compatibility - Closed-cell backer rod compatible with elastomeric, silicone, urethane and other cold-applied sealants.

Product Data & Ordering Information

Product codeGround (A)Flange (B)Drip leg (C)LengthPcs./Box

Lengths: All 10-foot long standard. Custom lengths upon request.
Colors: Available in white, tan, brown, gray or black.
Backer Rod: Blue standard, white backer rod optional (for clear sealants)

Product Notes:

  • Factory applied 3/8" x 3/8" backer rod is adhered 1/4" from the leading edge of the ground on BackerBead casing bead products, unless noted otherwise. Custom placement of the backer rod is available.
  • U.S. Patent Number D861,196
  • Backer Rod also available in white upon request for clear sealant applications
  • All Drip Flanges are 1/4" drip edge



Prior to setting the Drip Flange, clean all surfaces to receive the bead and remove any debris. Refer to sealant manufacturer’s recommendations on caulking this gap. Dry off surfaces. Have the backer rod touch the adjacent surface continuously.  Make sure the Drip Flange component on the Head opening extend 1/2" wider than the casing bead intersection below, terminating from the jamb.

BackerBead® Instalación

Code Approvals & Performance Standards

  • ASTM C926 Standard Specification for Application of Portland Cement - Based Plaster
  • ASTM C1063 Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
  • ASTM C1330 Standard Specification for Cylindrical Sealant Backing for Use with Cold Liquid-Applied Sealants
  • ASTM C1780 Standard Practice for Installation Methods for Cement-based Adhered Masonry Veneer
  • ASTM C1861 Standard Specification for Lathing and Furring Accessories, and Fasteners, for Interior and Exterior Portland Cement-Based Plaster
  • ASTM D1784 Standard Classification System and Basis for Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds
  • ASTM D4216 Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) and Related PVC and Chlorinated Poly(Vinyl Chloride) (CPVC) Building Products Compounds
  • ASTM E331 Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference
  • SDS Vinyl Corp PVC Compounds


All stored materials shall be kept dry.  Materials shall be stacked off the ground, supported on a level platform, and protected from the weather.

Product Submittal Sheets

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Product Code Description
BackerBead Drip Flashing - 3-1/2" Flange BackerBead® - Drip Flashing - 3-1/2" Flange

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