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 stab on ground - R 1.3. The concrete is good for 0.08 /inch, the R-5 stuf is probably r5, the insude surface is 0.64 and the outside surface, below grade is 0.64. The R-value is a fictitious number supposed to indicate a material's ability to resist heat loss.

To obtain a wall or ceiling assembly R-value you must add the r-values of the individual components together. Concrete is a great thermal mass, but a terrible insulator. Normal Weight Concrete at 150 pcf has an R value of 1.22 per inch thickness Air-entrained Concrete 3.90 Urea terpolymer foam 4.48 Rigid fiberglass (> 4 lb/ft3) 4.00 Expanded Polystyrene (bead-board) 4.00 Extruded Polystyrene 5.00 Polyurethane (foamed-in-place) 6.25 Polyisocyanurate (foil-faced) 7.20 Construction Materials Concrete Block 4 inch 0.80 Concrete Block 8 inch 1.11 Concrete Block 12 inch 1.28 Suspended timber froor - R 1.3. the concrete masonry wall by itself or the concrete masonry wall plus a prescribed R-value of added insulation, or the overall U-factor of the wall. (152 mm) 105 pcf (1,682 kg/m³) backup insulated with 2 in. If you live in a place where the the average temperature is above or below about 70 degrees fahrenheit, it should really be insulated. Windows are the weakest link when trying to retain heat inside during winter or keep it out during summer. 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.

Windows are cold during winter because they lose so much heat, which can produce a … This webpage calculates the R-value of walls, roofs and suspended floors for most insulation material R-values. First, the R-Value of BuildBlock’s polystyrene alone is R-20, compared to wood frame’s R-9 to R-15 and concrete block of R-2. Windows and skylights. However, U-value is the measurement of heat transmission through concrete slab from ground into the closed space or vice versa. The bag in which the perlite or vermiculite is purchased recommends the mix proportions needed to achieve various unit weights of fresh concrete and oven-dry concrete. (1) the R-Value of the expanded polystyrene, (2) the thermal mass of the concrete, and (3) the enormous reduction in air infiltration. A wall’s thermal resistance, or its R-value, is its ability to slow the transfer of heat from one side to the other.

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