Attic Insulation R Value Wisconsin

R value is a measure of insulation s ability to resist heat flow.

Attic insulation r value wisconsin.

C computed r values may not include values for air films or for building materials other than insulation materials. In layers such as framing cavity insulation and insulating sheath ing shall be summed to compute the component r value. Where you live different climates require different insulation r values. The r value needed depends on the insulation s type material thickness and density.

The higher the r value the better the thermal performance of the insulation. Blown in cellulose is the most common product we install for insulating large attic spaces. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. Insulation levels 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 in your attic to reach r 30 if you live in zones 2 or 3. A r 38 will satisfy the ceiling r value requirement for a dwelling where the full height of uncompressed r 38 insulation extends over the wall top plate at the eaves. For most homes in the southeastern wisconsin area r49 rated insulation is enough to keep homes properly insulated as it s 16 5 thick. If your exterior walls are constructed from 2 by 4 inch studs the most insulation that can go into the wall while retaining its r value is r 13 or r 15 as these are both made to fit a cavity 3 1 2 inches deep.

Code requirements in wisconsin dictate a minimum r value of 30 where there are no attic space r 38 for those with attics but they suggest r value of 49 where it can be accomplished. What r value do i need. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. The higher the r value the better the thermal performance of the insulation.

Your home s age if your home is more than 10 year old you likely need more insulation. The greater the heat resistance or r value the greater the insulation s effectiveness. Department of energy states that the best attic insulation has a rating between r49 and r60. R value is a measure of insulation s ability to resist heat traveling through it.

What r value does your home need. In the midwest region of the united states the u s. 1 ceilings with attic spaces. B the manufacturer s settled r value shall be used for blown insulation.

The table below shows what levels of insulation are cost effective for different climates and. Sps 322 32 specific insulation requirements. Insulation level are specified by r value. Recommended home insulation r values.