The factor that affects r value is heat transference and the cinder block while light was also dense edit because it was wet poured.
Cinder block insulation value.
Rosato asbestos insulation is the most authoritative source on asbestos properties and gives data for the thermal conductivity of asbestos in different forms and with varying temperatures for magnesia asbestos insulation at mean temperatures ranging from 100 f to 400 f the k value thermal.
Depending on the density of the blocks an 8 inch thick block wall without any other type of insulation has a thermal resistance value between r 1 9 and r 2 5.
In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation.
Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.
The insulation may be rigid board extruded or expanded polystyrene or polyisocyanurate closed cell spray polyurethane foam cellular glass fibrous batt or fibrous blown in insulation note however that fibrous insulation is susceptible to moisture.
Notes on the r value k values of different forms of asbestos.
By comparison plywood has an r value of 2 5.
Notes to the table above.
Conventional 8 inch concrete block walls have an r value of 0 08 per square inch or about 2 5 for the whole block.
Check with your local material suppliers for exact r values and prices of materials.
Interior insulation refers to insulation applied to the interior side of the concrete masonry as shown in figure 1.
Following the chart shown here you can build a concrete masonry wall with an r value equal to the r value of an insulated 6 inch wood frame wall.
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 masonry wall assemblies whole wall r values for.
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Walls are much greater than conventional 3 web concrete block walls.