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Crownduit® Crown Moulding Keystone Panel

Add-on keystone connector for Crownduit crown moulding

Item # 388KS45

Use this keystone connector to fill in gaps between pieces of Crownduit crown moulding.

Use this keystone connector to fill in gaps between pieces of Crownduit crown moulding.

Item # 388KS45

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About the Crownduit® Crown Moulding Keystone Panel

Complete the look of your Crownduit crown moulding

If you use Crownduit's crown moulding system, you can pick up this keystone connector to fill in the gaps between crown moulding pieces. It seamlessly installs onto the main crown moulding and track kit and for a finished, sophisticated look. 

Product highlights:

  • keystone piece for Crownduit's crown moulding and track system
  • seamlessly connects and hides gaps between two main crown moulding pieces
  • made from paintable poplar wood
  • can be pre-finished and painted prior to installation
  • warranty: 60 days
  • MFR # KS-45

What's in the box:

  • Crownduit keystone seam cover with PVC backing

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More details on the Crownduit® Crown Moulding Keystone Panel

Stacey B.

Product Research


Overview: The Crownduit System gives you a unique way to hide your home audio/video wiring in your home. This Keystone piece (KS-45) lets you cover the seams where two linear pieces come together. The facing of the Crownduit moulding is made of natural poplar wood with a PVC backing that snaps into the mounting track (supplied with the Crownduit System linear pieces). Installation requires no nails, glue, or putty. Also available are outside corners (OT-45) and inside corners (IN-45), all sold separately.

Materials: Crownduit's faceplate and components are made from poplar wood, sourced and manufactured in the United States. Poplar has a tight, straight grain, which provides a smooth surface. It comes unfinished in its natural color, and you can stain or paint it prior to installation. The moulding installs between your walls and ceiling at a 45° angle. It is made in a classic Greek architectural style that would enhance the interior of most homes or businesses. The internal wire chase and mounting track is made of Color Master CMR4240 ridged PVC compound. The backing of the moulding and the facing of the mounting track snap together for easy installation.

Installation: The mounting track installs in full lengths where the crown moulding will be installed. It is held in place with 1-1/4" course sheetrock screws placed every 16", starting at the center of the wall and working toward the outer edges. When installing over doors and windows, you can install a decorative keystone. Along the mounting track, markings are made 3" apart to show where the ends of the linear pieces will be and where the keystone will be installed. After the straight crown moulding is installed, the keystone snaps into place on the mounting track to cover the seams.

Tools Needed for Installation:

  • Chop box
  • Hand saw
  • #2 Phillips screwdriver (with or without drill)
  • Measuring tape
  • Pencil
  • Black Marker
  • 1-1/4" Course sheetrock screws

Uses: The Crownduit System has many practical uses for routing cables around the room. It protects and conceals your wires, and is removable for adding or removing wires. You can route HDMI cable, speaker wire, Ethernet cable (including POE), and optical cables. Using Crownduit can also make it easier to add electrical outlets to a room without drilling through vertical studs. Installing LED rope lights or light strips on the Crownduit moulding provides an easy way to add indirect lighting to your room.


  • Keystone (KS-45): Width 8-1/8", Height 5-3/4" Depth 3/4" (1-1/2" w/ PVC backing)
  • Crown Moulding (sold separately):
    • Length (each): 7 feet 10 inches
    • Width: 5 inches
    • Thickness: 5/8 inch (1-1/4" with PVC backing)
  • Mounting Track (included with crown moulding):
    • Length (each): 7 feet 9-11/16 inches
    • Height: 3 inches
    • Depth: 2-5/8 inches
  • Installed Dimensions:
    • Height: 3-7/8 inches
    • Depth: 3-3/16 inches
    • Width: 5 inches
  • Other Accessory Pieces (sold separately):
    • Inside Corner (IN-45): Width 8-5/16", Height 4-1/4" Depth 6-3/4"
    • Outside Corner (OT-45): Width 8-3/8", Height 4-5/16" Depth 6-3/4"

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