Insulation in your space, home, garage, or office, helps to resist heat flow. A properly insulated space will help to make it more comfortable and reduce heating or cooling costs by making it more efficient.

R-Value is the rating at which your insulation resists heat flow through conduction. Conduction is the way heat moves from one object to another. Think of a coffee mug before and after you fill it with hot coffee.  So, the higher the R-value, the greater your insulation is at doing its job, insulating.  R-value is calculated by the type of insulation, its density and the thickness being applied.

Insulation effectiveness depends on where it is installed, as you add more loose-fill or blown-in insulation it begins to compress under its own weight. Because of this compression, the R-value does not continue to increase at the same rate with added thickness.  Consult Spring Valley Insulation or your insulation contractor to determine how much insulation you need for your space.

The amount of R-value or insulation you need will depend upon the part of your house or space you plan to insulate, our South California climate (Zone 3) and the type of cooling or heating system you currently have in your space. It’s important to factor in moisture control and air flow to keep your home comfortable, healthy and efficient.



The US Department of Energy recommends the following R-value ratings for each of the zones on the map above. We in Southern California fall within Zone 3 mostly for our energy rating. These recommendations have been conducted by Energy Star.

Zone Uninsulated Attic Existing 3-4″ of insulation Floor
Zone 1 R30 to R49 R25 to R30 R13
Zone 2 R30 to R60 R25 to R38 R13 to R19
Zone 3 R30 to R60 R25 to R38 R19 to R25
Zone 4 R38 to R60 R38 R25 to R30
Zone 5 R49 to R60 R38 to R49 R25 to R30