R Value Of Poured Concrete Walls

Concrete is a great thermal mass but a terrible insulator.

R value of poured concrete walls.

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. If you live in a place where the the average temperature is above or below about 70 degrees fahrenheit it should really be insulated. 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.

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. As we said before the r value measures the thermal resistance of a material. Eps block forms poured in place with concrete block walls 1 7 8 thick 15 2 15 7 103 7. Poured concrete foundations have r values of less than 3.

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. Poured concrete foundations icf foundations are more energy efficient less prone to moisture intrusion less sensitive to cold temperatures than poured concrete foundations. Assembly r value 1 assembly u value 1 u studs x u cavity x component. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50.

Depending on the density of the blocks an 8 inch thick block wall without any other type of. 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. Calculating assembly wall r value. The methodology for this calculation is described in the mass enhanced r value of precast concrete sandwich panels an industry standard.

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