R Values Of Concrete Block Walls
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 values of concrete block walls. 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. Concrete block wall with air in cavities r 2 0 concrete block wall with perlite in cavities r 2 9 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. Table 2 lists calculated u factors and r values of various thicknesses of concrete masonry walls for concrete densities of 85 to 135 lb ft 1 362 to 2 163 kg m with various core fills. 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.
R values u values coverage charts. The schundler company 150 whitman avenue p o. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50. Effects of water intrusion on insulating value and r values are not included in the above nor was there discussion of variation in thermal conductivity at block segments that are solid rather than perlite filled.
Table 3 shows the approximate percentage of grouted and ungrouted wall area for different vertical and horizontal grout spacings which can be used to. Concrete masonry wall assemblies whole wall r values for. Block and cavity fill. Walls are much greater than conventional 3 web concrete block walls.