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Find the total cost of the material for 28. HVAC The thermal resistance per inch, or R-value, of the components of an exterior wall are as follows: 3.15 Brick 0.20 Fiberglass Batting Plywood 0.20 1.25 Plaster Sheetrock 1.25 0.90 Wood Calculate the total R-value of a wall consisting of 1-in. of wood, 2 in. of brick, in. of plywood, in. of Sheetrock, 6 in. of fiberglass batting, and in. of plaster. (Round to the nearest tenth.)