R Value Of Poured Concrete Walls

Calculating assembly wall r value.

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. 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.

Poured concrete foundations have r values of less than 3. 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. Wood frame walls 3 plus r value of the insulation used floors above unheated spaces 2 plus r value of the insulation used.

2 x 4 wood stud wall 16 o c r 11 batts 1 2. An uninsulated foundation has an r value between that of a single and a double pane window. Concrete is a great thermal mass but a terrible insulator. Assembly r value 1 assembly u value 1 u studs x u cavity x component.

Depending on the density of the blocks an 8 inch thick block wall without any other type of. Wall outside air film winter 0 17. 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. Poured concrete foundations icf foundations are more energy efficient less prone to moisture intrusion less sensitive to cold temperatures than poured concrete foundations.

Concrete block makes a cost effective and structurally sound wall but it has little thermal resistance. The methodology for this calculation is described in the mass enhanced r value of precast concrete sandwich panels an industry standard.