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Show Energy Tip From Garkane Power Association Much is being said today to-day about R-values of the various types of insulation insula-tion and building materials. "R" simply means the thermal resistance of a material to the passage of heat. For example, loose-fill cellulose insulation has a 3.8 R value per inch of thickness; rock wool has 2.9 and fiberglass 2.2 per inch of thickness. An 8-inch concrete block wall with inside plaster has an R-value of 2.9, while a 1-inch wall of wood sheathing, with inside plaster has a little over 4. A double wood floor has a 3.6 R-value while the same double wood floor with asphalt tile surface has a 3.8 R-value. Single glass windows have a .88 while the same window with storm window win-dow has a 1.5 R-value. Solid wood doors, exposed to the outside average about an R-value of approximately ap-proximately 2. If you're planning to build or buy a new home, or even add on to your present home you should keep in mind the R-values of the various insulation and building materials. Remember, the higher the R-value the less the heat loss. |