12 Concrete Wall R Value

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12 concrete wall r value.

The reason that it is important to make a good estimate for the current r value for uninsulated spaces is that small changes in r values result in large changes in heat loss when the total r value is low. 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. The key to maximizing whole wall r values of concrete masonry walls is minimizing thermal bridges within the concrete masonry units. Concrete block wall with air in cavities r 2 0.

The isothermal analysis shows 90 thermal loss in this wall panel with. The r values u factors listed in this tek were determined by calculation using the code recognized series parallel also called isothermal planes calculation method refs. Concrete sand gravel aggregate. Concrete block makes a cost effective and structurally sound wall but it has.

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. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. Shows the total isothermal r value for the wall with the ability to factor in thermal breaks such as metal ties or solid concrete sections. 0 13 0 64 30.

By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. As we said before the r value measures the thermal resistance of a material. Cavity wall r values are listed in tek 6 1c r values of multi wythe concrete masonry walls ref. For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3.

Typical residential weight concrete 8 wall r 2 5. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. R inch r thick ness insulation materials fiberglass batt 3 14 fiberglass blown attic 2 20 1 fiberglass blown wall 3 20 rock wool batt 3 14 rock wool blown attic 3 10 rock wool blown wall 3 03 cellulose blown attic 3 13 cellulose blown wall 3 70 vermiculite 2 13 air entrained concrete 3 90 urea terpolymer foam 4 48. Concrete block wall with perlite in cavities r 2 9.