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R Value


This indicates a material’s amount of resistance to heat transfer. The higher this number, the more insulation the product provides. Other factors to consider when looking at R-Value are assembly, thickness, and location.

  • Assembly: To increase the accuracy of insulation’s R-value the entire assembly (exterior and interior walls as well as insulation material)is sometimes considered. But for most consumers calculation at this level is not necessary.
  • Thickness: A common misconception about the R-Value is that the thicker the insulation material, the more efficient it is. While the R-value may increase as the amount of insulation increases, there is actually a decreasing return in terms of efficiency. For example, fiberglass batting with an R-value of 3.3 increases to an R-value of 6.6 when the amount of material is doubled, however, the efficiency does not double in the same way.
  • Location: Building codes in different parts of the country call for different R-values. Fuel and material costs as well as climate conditions determine these varying insulation needs.


At Costa Building Supplies Ltd., our professional team specializes in supplying the highest quality of drywall in Vaughan and Cambridge. Visit us at costabuildingsupplies.com if you are looking for affordable drywall in Cambridge, Vaughan and the surrounding areas.

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