Sub Floor Insulation R Value

As a benchmark one inch of solid wood has an r value of 1.
Sub floor insulation r value. R value is a measurement of thermal resistance and measures the ability of heat to transfer from one side of an object to another. According to the 2012 irc the minimum r value for floor assemblies is r 13 in zones 1 and 2 r 19 in zones 3 and 4 r 30 in zones 5 and 6 and r 38 in zones 7 and 9. While an uninsulated timber floor is rated at only r0 7 with the addition of insulation carpet and underlay this can be increased to as much as r3 5 with the addition of r2 5 polyester underfloor insulation. R value is a measure of insulation s ability to resist heat traveling through it.
When possible r30 should be used for proper subfloor insulation. The common denominator among varieties of insulation is the r value. Insulation level are specified by r value. Your suggested approach will only work if there is no air leakage from the exterior to the empty joist bays.
In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and. The r value per inch for different types of insulation varies depending on the. The higher the r value the better the thermal performance of the insulation. So what is a good r value rating vs.
If the joist cavities are too shallow we will use the highest r value that will fit. Recommended home insulation r values. While there are additional considerations such as venting and moisture problems to take into account when you insulate under floors the united states department of energy recommends an r 25 rating in cold climates and an r 11 in warmer parts of the country. 10 bags model bf40 view the owens corning 2x6 wall floor insulation.
It s simple the higher the number the better the rating. The table below shows what levels of insulation are cost effective for different climates and. Owens corning r 19 ecotouch pink kraft faced fiberglass insulation batt 15 in. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.