What Is The Highest R Value For 6 Inch Batt 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.

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. For example a wall with 3 fiberglass batting r value of 10 8. This means for example that pink batts ultra r4 0 insulation is more effective than pink batts classic r1 8 insulation. Closed cell spray foam insulation.

High density sidewall batts are available in sizes to fit standard construction without loss of r value due to compression. There is no 4 inch thick faced fiberglass insulation in batts or rolls on the common market. Thanks to thanks to andrew cole for correcting our data on this product. Fiberglass vats are the standard insulator for 2 inch by 4 inch wall framing and are rated r 11 through r 15.

Pink batts classic is our lower r value range of insulation designed to achieve minimum building code requirements. 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. Polyurethane spray closed cell foam insulation.

These batts meet the energy saving requirements of today s codes without requiring changes in construction. Older homes especially those pre dating the 1950s may employ two by fours that truly are 2 inches by 4 inches. 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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

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. It has a lower r value per inch than closed cell foam and is vapor permeable. In this case use r 13 or r 15 fiberglass insulation. Polyisocyanurate polyurethane foam insulation r values.

For higher r. High density cathedral ceiling batts allow an airspace between the insulation and roof deck for ventilation. 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. Insulation or other building material 9.

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.