Wall Insulation R Value Chart

Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.

Wall insulation r value chart.

This is a huge difference and essentially comes down to astm c518 being a theoretical maximum based on a steady state thermal test of only a portion of the door panel. 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. Most insulation manufacturers will first list their insulation s r value for a one inch sample then they ll give you a chart demonstrating the other r values you can achieve if you install a thicker version of their product. R value is a measure of insulation s ability to resist heat traveling through it.

Based on astm c518 calculation method the door has an r value of up to 11 but using astm c1363 tested operable the same door only have an r value of up to 3 5. Try the r value calculator available through oak ridge. Insulation level are specified by r value. See the department of energy s doe ranges for recommended levels of insulation below.

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. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. 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. Our r value guide to rigid insulation includes the doe s recommended insulation by zone chart r value calculator and base building material r values chart.

Let s use the r value of iko s polyiso insulation enerfoil tm as an example. 8 thick concrete slab or foundation wall has an r value of about 1 04 30 while lightweight aggregate filled 8 thick concrete has an r value of about 2 18 30 concrete insulated 0 85 1 2. Note from this. 1 844 446 7858 my account.

For example a wall with 3 fiberglass batting r value of 10 8 11 9 may have an overall r value of nearly 14 because of siding sheathing and drywall.