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But concrete is a conductor of thermal energy not an insulator.
R value of poured concrete walls. Poured concrete foundations have r values of less than 3. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. Eps block forms poured in place with concrete block walls 1 7 8 thick 15 2 15 7 103 7.
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. Concrete block makes a cost effective and structurally sound wall but it has. Therefore technically it has no insulation value. Icf foundations have an r value of greater than 20.
Concrete block 4 inch 0 80 concrete block 8 inch 1 11 concrete block 12 inch 1 28 brick 4 inch common 0 80 brick 4 inch face 0 44 poured concrete 0 08 soft wood lumber 1 25 2 inch nominal 1 inch 1 88 2 x 4 3 inch 4 38 2 x 6 5 inch 6 88 cedar logs and lumber 1 33 sheathing materials plywood 1 25. 1 25 2 nominal 1 1 2 1 88 2x4 3 1 2 4 38 2x6 5 1 2 6 88. However too many people confuse insulation properties with thermal mass many icf dealers d. As we said before the r value measures the thermal resistance of a material.
To obtain a wall or ceiling assembly r value you must add the r values of the individual components together. For example a building with material with an r value of r 11 converts to an u value of 0 09 1 r or 1 11 0 09. 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. U value has an inverse relationship to r value.
Use the r value table below to help you determine the r value of your wall or ceiling assemblies. 2 x 4 wood stud wall 16 o c r 11 batts 1 2. Wood frame walls 3 plus r value of the insulation used floors above unheated spaces 2 plus r value of the insulation used. I agree mostly with junio s answer.
Figure 3 15 Illustrates A Poured Concrete Crawl Space With Exterior Rigid Insulation The Rigid Insulati Wall Section Detail Building Foundation Concrete Wall
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