Minimum R Value For Floor Insulation

1 for a list of generic r values for new insulation material.

Minimum r value for floor insulation. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. Maxi mum minimum fene stration u factor ceilings and expo sed floors r value wall r value floor r value base ment wall r value slab perim eter r value and depth 0 39 r 37a r 13 r 19 r 10 10 4 feet for si. Materials which are likely to be found in roof spaces and under suspended floors. The table below shows what levels of insulation are cost effective for different climates and.

The insulation s ability to resist heat flow determines its r value. The r value of carpets or floor coverings must not be included in calculation of floor r value for heated floors. Insulation level are specified by r value. R values identify insulation levels.

Building code requirements for house insulation previous r values for common construction types next. Minimum insulation r value requirements non residential above roof deck. Recommended home insulation r values. Installing more insulation in your home increases r value and the resistance to heat flow.

Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value. For heated walls or ceilings higher r values are required walls r 2 6 ceilings r 3 5. Where there is any doubt as to whether the insulation complies with the minimum performance requirements. State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state local mo missouri 2012 iecc 4 r 25 5 r 25 state only mt montana 2012 iecc 6 r 30.

R 30 ceiling insulation may be used in place of r 37 if the insulation achieves the full r value over the. 1 foot 304 8 mm. 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.

In calculating the r value of a multi layered installation the r values of the individual layers are added. The higher the r value the better the thermal performance of the insulation. R value the greater the insulating effectiveness. Must meet the minimum insulation requirements.

The r value of thermal insulation depends on the type of material its thickness and density.