R Value Of 12 Concrete Wall

Concrete block makes a cost effective and structurally sound wall but it has.

R value of 12 concrete wall.

Box 513 metuchen new jersey 08840 0513. Concrete block wall with perlite in cavities r 2 9. Block and cavity fill. 102 152 203 254 and 305 mm backup wythes and a 4 in.

Cellulose blown wall 3 70 vermiculite 2 13 air entrained concrete 3 90. Typical residential weight concrete 8 wall r 2 5. 102 mm hollow unit concrete masonry veneer. As we said before the r value measures the thermal resistance of a material.

R values u values coverage charts. The schundler company 150 whitman avenue p o. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. R value tables traditional three web units.

These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. 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. 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. 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. Table 2 presents r values of uninsulated concrete masonry cavity walls with 4 6 8 10 and 12 in. Concrete block wall with air in cavities r 2 0. 0 13 0 64 30.

Cavity wall r values are listed in tek 6 1c r values of multi wythe concrete masonry walls ref. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. Concrete block 12 inch 1 28 brick 4 inch common 0 80 brick 4 inch face 0 44. 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.