12 Concrete Wall R Value

Concrete block wall with air in cavities r 2 0.

12 concrete wall r value.

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 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. 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. 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.

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. 8 inch problock 12 inch problock. Concrete block wall with perlite in cavities r 2 9. 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.

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. Concrete sand gravel aggregate. 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. Typical residential weight concrete 8 wall r 2 5.

Cavity wall r values are listed in tek 6 1c r values of multi wythe concrete masonry walls ref. The isothermal analysis shows 90 thermal loss in this wall panel with. 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. The key to maximizing whole wall r values of concrete masonry walls is minimizing thermal bridges within the concrete masonry units.

As we said before the r value measures the thermal resistance of a material. 0 13 0 64 30. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. Concrete block makes a cost effective and structurally sound wall but it has.