In building and construction, the R-value is a measure of how well an object, per unit of its exposed area, resists conductive flow of heat: the greater the R-value, the greater the resistance, and so the better the thermal insulating properties of the object.
When insulating a house, the greater the R-value, the better thermal performance, regardless of the brand/make of the product.
When building a new home, the builder will have minimum insulation requirements for the home. These requirements may meet building standards, but they may fall short of optimum thermal performance. You can always discuss with your builder the option to upgrade your insulation. Asking about higher R-value product for your ceiling and walls may cost you a few extra dollars now, but could save you ongoing energy costs for years to come.
The rule of thumb is to maximise your R-value, as much as your budget will allow. Focus on your ceiling first (as more heat is lost through your ceiling than walls), then your walls. Remember that insulation is a cost you only spend once. Your savings will continue as long as your house is standing.
The minimum R-values recommended are R4.0 ceiling and R2.0 wall insulation.
|Area of Home||Thermal or Acoustic Purpose||R-Value Recommended|
|Internal Walls||Acoustic (reduce noise)||R2.5 HD|
|Home Theatre Rooms||Acoustic (reduce noise)||R2.7 HD|
|Between floors||Acoustic (reduce noise)||R2.5 HD|