12 Concrete Wall R Value

Concrete sand gravel aggregate.

12 concrete wall r value.

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. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. 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.

Cavity wall r values are listed in tek 6 1c r values of multi wythe concrete masonry walls ref. 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. Concrete block makes a cost effective and structurally sound wall but it has. Concrete block wall with air in cavities r 2 0.

The key to maximizing whole wall r values of concrete masonry walls is minimizing thermal bridges within the concrete masonry units. 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. Typical residential weight concrete 8 wall r 2 5. Block type density fill r in 32 x 48 48 x 48 48 x 72 72 x 72 problock 85 pcf 4 6 0 224 0 199 0 183 0 166.

Concrete block wall with perlite in cavities r 2 9. The isothermal analysis shows 90 thermal loss in this wall panel with. You will notice in the findings shown in the isothermal analysis that the thermomass wall panel has a material r value of r 11 49. 8 inch problock 12 inch problock.

As we said before the r value measures the thermal resistance of a material. 8 thick concrete slab or foundation wall has an r value of about 1 04 30 while lightweight aggregate filled 8 thick concrete has an r value of about 2 18 30. 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. 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.