R Value Of 10 In Thick Concrete Wall

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.

R value of 10 in thick concrete wall.

Depending on the density of the blocks an 8 inch thick block wall without any other type of insulation has a thermal resistance value between r 1 9 and r 2 5. Typical insulation r values panel panel r value options thickness fabrication standard premium 8 3 x 2 x 3 r 10 up to r 13 10 3 x 4 x 3 r 18 up to r 22 12 3 5 x 5 x 3 5 r 22 up to r 34 panel fabrication is inches of exterior wythe x inches of insulation x inches of interior wythe r value rating for regular sandwich panels. 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. 102 mm hollow unit concrete masonry veneer.

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. Total r value r value means the thermal resistance m2k w of a material calculated by dividing the thickness by its thermal conductivity. The r value of an uninsulated 8 inch thick basement wall built using normal weight concrete is 1 35 based on data from the 1993 american society of heating refrigeration and air conditioning engineers handbook. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Table 2 presents r values of uninsulated concrete masonry cavity walls with 4 6 8 10 and 12 in. Total r values are based on the sum of all components of the building system including indoor and outdoor air films building materials used in the system and air spaces. Calculators have been created for precast sandwich panels single layer panels and precast flooring and make calculating r values simple. Choose from a number of variables such as concrete thickness insulation climate zone building class and the calculator will provide the total r value of the wall or flooring system.

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.