Insulation level are specified by r value.
Recommended r values for wall insulation.
Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces.
The r refers to absolute thermal resistance.
Department of energy r value recommendations for new and existing homes.
Thickness density and type of materials are some factors that contribute to.
You can achieve better thermal performance in your attic by adding an additional layer of insulation.
R value is a measure of insulation s ability to resist heat traveling through it.
The higher the r value the better the thermal performance of the insulation.
See the department of energy s doe ranges for recommended levels of insulation below.
Fiberglass batts for standard 2 4 walls are now available in low medium and high density products that range from r 11 to r 15.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
Other considerations may include indoor air quality impacts life cycle costs recycled content embodied energy and ease of installation especially if you plan to do the.
Note from this.
R value is a standard unit of measurement for determining among many things how effective your insulation will be.
The higher the r value the better the thermal performance of the insulation.
Recommended home insulation r values.
To choose the best insulation for your home from the many types of insulation on the market you ll need to know where you want or need to install the insulation and what r value you want the installation to achieve.
Achieving greater r values in exterior walls.
The following 2008 department of energy zone recommendations are based on comparing estimated future energy savings to the current cost of installing insulation.
While wall insulation is limited by the width of the studs different materials provide higher or lower r values.