CertaTrim Skirtboard with DualStart design provides a starter board for fiber cement siding.

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. 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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