What Is The Highest R Value For 6 Inch Batt Insulation

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.

What is the highest r value for 6 inch batt insulation.

These batts meet the energy saving requirements of today s codes without requiring changes in construction. Closed cell spray foam has a far better r value per inch than other less effective insulations like cellulose fiberglass or even open cell foam. Polyurethane spray closed cell foam insulation. For higher r.

Unfinished foundation and basement walls are typical applications for these boards which only require two to three inches to achieve the recommended r 11 for basement. Aging effects comments. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Rigid foam insulation comes in various materials including polystyrene r 3 8 to r 5 0 polyurethane r 5 5 to r 6 5 and polyisocyanurate r 5 6 to r 8 0.

It has a lower r value per inch than closed cell foam and is vapor permeable. High density cathedral ceiling batts allow an airspace between the insulation and roof deck for ventilation. The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13. Polyisocyanurate polyurethane foam insulation r values.

Insulation or other building material 9. Fiberglass blankets or rolls provide an r value of up to 3 2 per inch so a 6 inch fiberglass batt may achieve an r value of 19 2 and some high performance products. The higher the r value the better the insulation is at reducing heat flow. Fiberglass vats are the standard insulator for 2 inch by 4 inch wall framing and are rated r 11 through r 15.

Thanks to thanks to andrew cole for correcting our data on this product. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. This means for example that pink batts ultra r4 0 insulation is more effective than pink batts classic r1 8 insulation. In this case use r 13 or r 15 fiberglass insulation.

High density sidewall batts are available in sizes to fit standard construction without loss of r value due to compression. Pink batts classic is our lower r value range of insulation designed to achieve minimum building code requirements. There is no 4 inch thick faced fiberglass insulation in batts or rolls on the common market. For example a wall with 3 fiberglass batting r value of 10 8.

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.