The r value per inch for different types of insulation varies depending on the.
Sub floor insulation r value.
Owens corning r 19 ecotouch pink kraft faced fiberglass insulation batt 15 in.
Fiberglass insulation batts are installed in the cavities between floor joists and held snug to the subfloor with twine or lathe.
The common denominator among varieties of insulation is the r value.
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.
As a benchmark one inch of solid wood has an r value of 1.
In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and.
If the joist cavities are too shallow we will use the highest r value that will fit.
Insulation level are specified by r value.
Recommended home insulation r values.
R values for flooring and subfloor materials comparative r values of building flooring subfloors heatizon offers this handy r values chart to help design your radiant heating application to determine the amount of heat needed or required.
So what is a good r value rating vs.
It s simple the higher the number the better the rating.
10 bags model bf40 view the owens corning 2x6 wall floor insulation.
The higher the r value the better the thermal performance of the insulation.
R value is a measure of insulation s ability to resist heat traveling through it.
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.
The table below shows what levels of insulation are cost effective for different climates and.
Your suggested approach will only work if there is no air leakage from the exterior to the empty joist bays.
When possible r30 should be used for proper subfloor insulation.