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By doubling the thickness of the wall to 16 inches the r value only increases by 0 50.
R value of poured concrete walls. 2 x 4 wood stud wall 16 o c r 11 batts 1 2. 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. If you live in a place where the the average temperature is above or below about 70 degrees fahrenheit it should really be insulated. Poured concrete foundations icf foundations are more energy efficient less prone to moisture intrusion less sensitive to cold temperatures than poured concrete foundations.
Depending on the density of the blocks an 8 inch thick block wall without any other type of. Icf foundations have an r value of greater than 20. Concrete block makes a cost effective and structurally sound wall but it has little thermal resistance. 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.
Wood frame walls 3 plus r value of the insulation used floors above unheated spaces 2 plus r value of the insulation used. Mass enhanced r value for sandwich panels. Eps block forms poured in place with concrete block walls 1 7 8 thick 15 2 15 7 103 7. 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.
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. Assembly r value 1 assembly u value 1 u studs x u cavity x component. Calculating assembly wall r value. An uninsulated foundation has an r value between that of a single and a double pane window.
Poured concrete foundations have r values of less than 3. Concrete is a great thermal mass but a terrible insulator.
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