12 Concrete Wall R Value

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.

12 concrete wall r value.

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. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. As we said before the r value measures the thermal resistance of a material.

Concrete sand gravel aggregate. Shows the total isothermal r value for the wall with the ability to factor in thermal breaks such as metal ties or solid concrete sections. The r values u factors listed in this tek were determined by calculation using the code recognized series parallel also called isothermal planes calculation method refs. 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.

For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15. Cavity wall r values are listed in tek 6 1c r values of multi wythe concrete masonry walls ref. Concrete block wall with air in cavities r 2 0. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Block type density fill r in 32 x 48 48 x 48 48 x 72 72 x 72 problock 85 pcf 4 6 0 224 0 199 0 183 0 166. You will notice in the findings shown in the isothermal analysis that the thermomass wall panel has a material r value of r 11 49. Typical residential weight concrete 8 wall r 2 5. Concrete block wall with perlite in cavities r 2 9.

The reason that it is important to make a good estimate for the current r value for uninsulated spaces is that small changes in r values result in large changes in heat loss when the total r value is low. 0 13 0 64 30. Concrete block makes a cost effective and structurally sound wall but it has. 8 inch problock 12 inch problock.