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R values of concrete block walls. 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. Siding wood bevel. R values u values coverage charts. 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 value of building materials. 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. Empty core 1 11 0 97 concrete block normal wt. Block and cavity fill.
Wall outside air film. Concrete sand gravel aggregate. Concrete block wall with perlite in cavities r 2 9. 3 1 2 fiberglass batt.
Fiberglass batt 3 14 fiberglass blown attic 2 20 1 fiberglass blown wall 3 20 rock wool batt 3 14 rock wool blown attic 3 10 rock wool blown wall 3 03 cellulose blown attic 3 13 cellulose blown wall 3 70 vermiculite 2 13 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. Material r inch r thick ness insulation materials. R value means the thermal resistance m2k w of a material calculated by dividing the thickness by its thermal conductivity. Typical masonry systems r value per inch r value per unit brick 90 lb cu ft 0 20 brick 120 lb cu ft 0 11 concrete block normal wt.
As we said before the r value measures the thermal resistance of a material. 0 13 0 64 30. The schundler company 150 whitman avenue p o. One of the best ways to maintain indoor temperatures is to stop outside air from entering.
The key to maximizing whole wall r values of concrete masonry walls is minimizing thermal bridges within the concrete masonry units and increasing the thermal resistance of the concrete used to produce concrete masonry units. Box 513 metuchen new jersey 08840 0513. How to increase the r value of a concrete block wall reduce air infiltration. R value measures the ratio of the temperature difference across an insulator concrete masonry wall and the heat flux heat transfer per unit area per unit time.
Empty core 1 71 1 28 concrete block light weight 8 in. Total r values are based on the sum of all components of the building system including indoor and outdoor air films building materials used in the system and air spaces. Typical residential weight concrete 8 wall r 2 5.
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