R-Value Truths

We have all heard that the higher the R-Value the better the insulation…
but is that the whole truth of it?
Did you know, the real R-value of insulation when installed can be as little as 50% of the R-value listed on the package. (Source: California Energy Commission study)
R-Values measure how heat moves through an insulation material by conductive heat flow, but a home can lose heat in 3 ways:

  • Conductive conductive convection radiation image
  • Convection
  • Radiation

Building codes set standards for the minimum R-Value of a new construction, but if there are gaps in your insulation then air is allowed to pass through, effectively making your insulation worthless. In order to get the maximum effectiveness of your R-Values, then your home needs to be properly air-sealed with every nook and cranny filled…. NO GAPS!

Questions about how to improve your home?

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(715) 765-4483


14 + 11 =

Effective R-Values Bat Insulation image
*Derived from ASHRAE document “Heat Transmission Coefficients for Walls, Roofs, Ceiling, and Floors” 1996

Good — No gaps or other imperfections.
Fair — Gaps over 2.5% of insulated area. (This equals 3/8 inch space along a 14.5 inch batt.)
Poor — Gaps over 5% of the insulated area. (This equals 3/4 inch space along a 14.5 inch batt.)

Please note: Homes built after 1994 most likely have the 6″ for walls and 12″
for roofs, that is the current installation standards for new homes.
Homes built prior to 1994 will probably have thinner batt Insulation installed.

The Truth About Insulation R-Values by Icynene™ Video:
The Truth About Insulation R-Values by Applegate™ Video: