What Is The Highest R Value For 6 Inch Batt Insulation

The r value is r 3 5 to r 3 6 per inch so filling a 2 4 cavity yields about an r 13.

What is the highest r value for 6 inch batt insulation. 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. Thanks to thanks to andrew cole for correcting our data on this product. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. 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.

There is no 4 inch thick faced fiberglass insulation in batts or rolls on the common market. Pink batts classic is our lower r value range of insulation designed to achieve minimum building code requirements. Fiberglass vats are the standard insulator for 2 inch by 4 inch wall framing and are rated r 11 through r 15. Polyurethane spray closed cell foam insulation.

In order to achieve the higher insulation r value of r 21 a different type of. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. High density sidewall batts are available in sizes to fit standard construction without loss of r value due to compression. Closed cell spray foam insulation.

It has a lower r value per inch than closed cell foam and is vapor permeable. 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. For example a wall with 3 fiberglass batting r value of 10 8. Polyisocyanurate polyurethane foam insulation r values.

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. Older homes especially those pre dating the 1950s may employ two by fours that truly are 2 inches by 4 inches. Insulation or other building material 9. In this case use r 13 or r 15 fiberglass insulation.

These batts meet the energy saving requirements of today s codes without requiring changes in construction. For higher r. High density cathedral ceiling batts allow an airspace between the insulation and roof deck for ventilation. This means for example that pink batts ultra r4 0 insulation is more effective than pink batts classic r1 8 insulation.

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.