Composite wood shutters made with Extira

The Rockbridge™ shutter collection is made entirely of Extira®. Also Larson's PlacerCraft™ wood raised panel shutters are made standard with Extira® panels.

Rockbridge exterior composite shutters are made are made with Extira® panels and are crafted with the same woodworking techniques and milled with the same machinery that our quality real wood shutters are.

Extira® is a revolutionary new-to-the-world
material that is unique:

  • Extira® resists moisture, rot and termites and offers excellent performance in exterior environments.
  • Extira® can be used in paint-grade EXTERIOR applications. It also works well for high moisture interior environments.
  • Extira Panels: Take It Outside!
  • Exterior composite shutters are moisture, rot and termite resistant
  • Extira panels are treated with zinc borate
  • Phenolic-bonded for exterior durability
  • Essentially no formaldehyde emissions


Moisture Resistance, as measured by ASTM D1037 (water absorption and thickness swelling). Rot Resistance, as measured by AWPA E-10 (standard method of testing wood preservatives by laboratory soft-block cultures). Termite Resistance, as measured by AWPA E-7 (standard method for laboratory evaluation to determine resistance to subterranean termites).


extira ingredients