R Values Of Concrete Block Walls

Concrete masonry wall assemblies whole wall r values for.

R values of concrete block walls.

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. R values u values coverage charts. 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. 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.

Walls are much greater than conventional 3 web concrete block walls. 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. The increase achieved by injecting aminoplast foam insulation is up to 264 greater than is possible with normal weight concrete masonry walls injected with the same aminoplast foam insulation. In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation.

Concrete block makes a cost effective and structurally sound wall but it has. Block and cavity fill. A wall s thermal resistance or its r value is its ability to slow the transfer of heat from one side to the other. By doubling the thickness of the wall to 16 inches the r value only increases by 0 50.