Exterior Wall R Value Insulation Chart

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.

Exterior wall r value insulation chart.

Also included is the hugely helpful insulation zip code calculator that spells out the suggested amount of r value necessary for the different portions of a structure like foundation interior and exterior walls attic and more. 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 the chart above you will notice that there are two vastly different r values provided for insulated metal doors with polyurethane insulation. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Insulation level are specified by r value. Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior. R inch r thick ness insulation materials fiberglass batt 3 14 fiberglass blown attic 2 20 1 fiberglass blown wall 3 20 rock wool batt 3 14 rock wool blown attic 3 10 rock wool blown wall 3 03 cellulose blown attic 3 13 cellulose blown wall 3 70 vermiculite 2 13 air entrained concrete 3 90 urea terpolymer foam 4 48. The higher the r value the better the thermal performance of the insulation.

Recommended home insulation r values. 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. See the department of energy s doe ranges for recommended levels of insulation below. As a benchmark one inch of solid wood has an r value of 1.

U factor is a measure of a component assembly in its conductive and radiate capacities. Note from this. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. The table below shows what levels of insulation are cost effective for different climates and.

R value actually stands for resistive value. What is the difference. 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. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7.