What Is The Highest R Value For 6 Inch Batt Insulation

The higher the r value the better the insulation is at reducing heat flow.

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

Aging effects comments. In order to achieve the higher insulation r value of r 21 a different type of. Polyurethane spray closed cell foam insulation. Polyisocyanurate polyurethane foam insulation r values.

Thanks to thanks to andrew cole for correcting our data on this product. Older homes especially those pre dating the 1950s may employ two by fours that truly are 2 inches by 4 inches. For higher r. 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.

This means for example that pink batts ultra r4 0 insulation is more effective than pink batts classic r1 8 insulation. These batts meet the energy saving requirements of today s codes without requiring changes in construction. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. It has a lower r value per inch than closed cell foam and is vapor permeable.

Pink batts classic is our lower r value range of insulation designed to achieve minimum building code requirements. 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. Fiberglass vats are the standard insulator for 2 inch by 4 inch wall framing and are rated r 11 through r 15.

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. Insulation or other building material 9. 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. 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. 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. High density cathedral ceiling batts allow an airspace between the insulation and roof deck for ventilation. Closed cell spray foam insulation.

There is no 4 inch thick faced fiberglass insulation in batts or rolls on the common market.