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.

Recommended r values for wall insulation.

Thickness density and type of materials are some factors that contribute to. While wall insulation is limited by the width of the studs different materials provide higher or lower r values. R value is a measure of insulation s ability to resist heat traveling through it. Achieving greater r values in exterior walls.

The higher the r value the better the thermal performance of the insulation. Higher r value numbers mean that the insulating material resists the cold or heat from the outside better. The r refers to absolute thermal resistance. Department of energy r value recommendations for new and existing homes.

See the department of energy s doe ranges for recommended levels of insulation below. The higher the r value the better the thermal performance of the insulation. Note from this. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

You can achieve better thermal performance in your attic by adding an additional layer of insulation. Insulation level are specified by r value. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed your attic to reach r 30 if you live in zones 2 or 3. 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.

The following 2008 department of energy zone recommendations are based on comparing estimated future energy savings to the current cost of installing insulation. Recommended home insulation r values. R value is a standard unit of measurement for determining among many things how effective your insulation will be.