Three-Piece Trimboard System

To help you finish window, door and other openings more quickly and neatly, CertainTeed now offers trimboard and J-Pocket trimboard with a grooved design similar to that of the one-piece ourside corner.

The trimboard system installation consists of (A) fastening the starter flange to the wall, (B) inserting the nail hem flange into the trimboard grooves and (C) fastening the trimboard system to the wall via the nail hem).

See our catalog for complete product offering.

InvisiPro Installation System

See the complete Restoration Millwork Installation Guide for additional details.


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 TrimTight™ cellular PVC cement. Our complete installation manual gives you the detailed instructions you need to help with proper installation.


Warranty Details

CertainTeed stands behind our Restoration Millwork® product with a 25-year limited warranty.

Sustainability Information

NAHB Research Center Green Approved

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