BackerBead® with E-Flange™

Combination PVC Casing Bead with built-in closed cell backer rod

Factory-applied, closed-cell backer rod provides a sealed separation gap 1/4" wide where stucco abuts dissimilar materials such as the perimeter of window and door openings per ASTM C1063.


ClarkDietrich BackerBead® eliminates the need to install a backer rod separately, as the product features a factory-applied backer rod that is affixed to the vinyl casing bead and set to the exact height and depth. This allows the installer to create a “gap” on the wall without the hassle of aligning it in the field, thereby saving time and materials. When the gap is properly caulked, the blue backer rod will no longer be visible. E-Flange profile provides 80% more stucco embedment than traditional flat flange profiles.

Closed-cell backer rod compatible with elastomeric and other cold-applied sealants. The factory applied backer rod is adhered with setback of 1/4" from the leading edge of the ground on BackerBead casing bead products, unless noted. BackerBead also available with a solid 1-3/4" flange upon request. Backer Rod also available in white upon request for clear sealant applications.

Vinyl is impervious to corrosion when coated in veneer plaster, wet joint compounds, or when placed in contact with steel or aluminum frames and resists impacts, dents, and damage during construction. No priming is required to add paint to vinyl products due to its paint adhesion properties. Vinyl has low electrical and thermal conductivity and is considered an excellent insulator, as well as being self-extinguishing and offering better resistance to burning than many other common building materials. Additionally, vinyl has a lower cost than equivalent products manufactured from zinc or aluminum, for use when the highest levels of corrosion resistance are required.



Prior to setting the BackerBead, 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.

Easy Embedment System

BackerBead® Instalación


ASTM & Code Standards:

  • Vinyl Material: Complies with ASTM D1784 and ASTM C1063, Table 1, PVC for exterior use.
  • Backer Rod: Closed cell material per ASTM C1330, square, flexible continuous lengths of extruded polyethylene foam used as a backing material.
    • Tensile Strength (ASTM D 5249) …5.5 psi, 38.2 (kPa)
    • Density (ASTM D1622)…..1.3-2.3 lb/cu.ft., 20-37 kg/ (avg.)
  • BackerBead components are chemically Inert & virtually dust free
  • SDS & Product Certification Information
  • Passed ASTM E331 - Standard Test Method for Water Penetration of Exterior Windows, Skylights, Doors, and Curtain Walls by Uniform Static Air Pressure Difference.  This ASTM performance covers the determination of the resistance of exterior windows, curtain walls, skylights, and doors to water penetration when water is applied to the outdoor face and exposed edges simultaneously with a uniform static air pressure at the outdoor face higher than the pressure at the indoor face.   Stucco was tested in this condition both with the BackerBead® and caulking, vs. no bead and caulked gap, which did not pass the E331 test.  Test results are available upon request.

Product Submittal Sheets

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Product Code Description
BackerBead with  E-Flange BackerBead with E-Flange

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