R Value Of Poured Concrete Walls

A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. Poured concrete foundations have r values of less than 3. Reference table for u values u value is the coefficient of transmission i e the transmission of heat through the materials which compose the building s envelope or outer shell.

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Use the r value table below to help you determine the r value of your wall or ceiling assemblies.

R value of poured concrete walls.

1 25 2 nominal 1 1 2 1 88 2x4 3 1 2 4 38 2x6 5 1 2 6 88. U value has an inverse relationship to r value. As we said before the r value measures the thermal resistance of a material. But concrete is a conductor of thermal energy not an insulator.

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. Therefore technically it has no insulation value. 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.

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. Poured concrete walls can leak moisture through non structural cracks in the wall where the floor and wall meet at the top of the foundation wall or through the porous concrete. Wood frame walls 3 plus r value of the insulation used floors above unheated spaces 2 plus r value of the insulation used.

However too many people confuse insulation properties with thermal mass many icf dealers d. Cedar logs and lumber. Eps block forms poured in place with concrete block walls 1 7 8 thick 15 2 15 7 103 7. Concrete block makes a cost effective and structurally sound wall but it has.

2 x 4 wood stud wall 16 o c r 11 batts 1 2. To obtain a wall or ceiling assembly r value you must add the r values of the individual components together. Icf foundations have an r value of greater than 20. 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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