R Value Of Poured Concrete Walls

Concrete is a great thermal mass but a terrible insulator. Wood frame walls 3 plus r value of the insulation used floors above unheated spaces 2 plus r value of the insulation used. Concrete block makes a cost effective and structurally sound wall but it has little thermal resistance.

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R value of poured concrete walls.

An uninsulated foundation has an r value between that of a single and a double pane window. Calculating assembly wall r value. Icf foundations have an r value of greater than 20. Depending on the density of the blocks an 8 inch thick block wall without any other type of.

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. If you live in a place where the the average temperature is above or below about 70 degrees fahrenheit it should really be insulated. 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. 2 x 4 wood stud wall 16 o c r 11 batts 1 2.

The methodology for this calculation is described in the mass enhanced r value of precast concrete sandwich panels an industry standard. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. Mass enhanced r value for sandwich panels. Poured concrete foundations icf foundations are more energy efficient less prone to moisture intrusion less sensitive to cold temperatures than poured concrete foundations.

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. Eps block forms poured in place with concrete block walls 1 7 8 thick 15 2 15 7 103 7. As we said before the r value measures the thermal resistance of a material. Wall outside air film winter 0 17.

Poured concrete foundations have r values of less than 3. 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.

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