CertaTrim Skirtboard with DualStart design provides a starter board for fiber cement siding.  CertaTrim Skirtboard is also reversible, offering a Smooth and Select Cedar side.

Designed with identical beveled edges to set the first course and built-in drip edge at the bottom.


  • Cellular PVC trim that installs like wood
  • Superior quality and excellent dimensional accuracy
  • Low-maintenance, long-lasting material
  • Natural White and ready to install
  • Can be painted to complement with exterior colors
  • Cuts and mills with traditional woodworking tools
  • Class A (Class 1) Flame Spread Classification
  • Stays beautiful without the need for painting
  • Meets ICC and CCMC code requirements.
  • 20-year limited warranty.


Technical Information

View technical specification guide and safety data sheet for product details.


Installing CertaTrim® properly is critical. For proper installation, using an appropriate PVC cement is critical especially for miter and scarf joints to help control expansion and contraction. We recommend Extreme PVC Trim Welder® or Partite® Adhesive.View installation guidelines before starting your project.

Warranty Details

CertainTeed's CertaTrim® is backed by a 20-year limited warranty. View warranty for details.

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