R Value Of Poured Concrete Walls

Poured concrete foundations have r values of less than 3. Calculating assembly wall r value. Concrete is a great thermal mass but a terrible insulator.

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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.

R value of poured concrete walls.

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 little thermal resistance. Wall outside air film winter 0 17. Mass enhanced r value for sandwich panels.

The methodology for this calculation is described in the mass enhanced r value of precast concrete sandwich panels an industry standard. Assembly r value 1 assembly u value 1 u studs x u cavity x component. An uninsulated foundation has an r value between that of a single and a double pane window. Wood frame walls 3 plus r value of the insulation used floors above unheated spaces 2 plus r value of the insulation used.

Poured concrete foundations icf foundations are more energy efficient less prone to moisture intrusion less sensitive to cold temperatures than poured concrete foundations. Icf foundations have an r value of greater than 20. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. 2 x 4 wood stud wall 16 o c r 11 batts 1 2.

As we said before the r value measures the thermal resistance of a material. What is special about the sandwich panel r value calculator is that for the first time ever you can calculate a mass enhanced r value for a sandwich panel wall. Depending on the density of the blocks an 8 inch thick block wall without any other type of. If you live in a place where the the average temperature is above or below about 70 degrees fahrenheit it should really be insulated.

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. 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.

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