Open Shutters A natural fit for Australian living

Thermal and insulation properties of cedar

Open cedar shutters help improve the quality of life through their thermal qualities. Being solid Western Red Cedar, we have found that Open Shutters insulate a home by improving heat loss by up to 47%. The resultant reduction in heat transfer significantly lowers the requirements for air conditioning. Which simply means lower power bills.

Motorised exterior cedar louvres, Saffire Freycinet, Robert Morrison Nunn & Assoc, 2010

Cedar shutters have an R value 4 times that of brick

  • Western Red Cedar is an excellent thermal insulator, far outperforming brick, concrete, steel and aluminium. It protects buildings and houses from the extremes of heat and cold.
  • The cellular structure creates low density and air spaces that make it the best insulator of any available softwood.
  • Its thermal conductivity factor K is 0.74 BTU in / ft2 h F.
  • thermal conductivity in units of watts per meter per Kelvin (W·m−1·K−1) is 0.11.
  • Cedar has an R-value of 1.35 per 25mm of thickness
  • The R value is equivalent of 100mm of brick.

Interior shutters just as effective insulator as external installation

Until recently it was commonly thought the best insulation was achieved by placing shutters outside. However recent research seems to indicate the tightness of the vacuum between the window and its covering is the main requirement for good insulation. If this becomes the accepted wisdom, then it should make no difference if your shutter is inside or outside the home as long as it is a snug fit. When one considers that shutters outside require more maintenance an interior installation becomes compelling.

  • Thermal conductivity in units of watts per meter per Kelvin (W·m−1·K−1):
  • Aluminium 210 - 250.
  • Concrete 0.8 – 1.28
  • Polymer high density: 0.33 - 0.52
  • Cedar 0.11