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¼-inch plywood 0.31 3/8 inch plywood 0.47 ½-inch plywood 0.62 5/8 inch plywood 0.78 This is taken from http://www.sizes.com/units/rvalue.htm, which also has some other materials that could/would commonly be used alongside with plywood to increase the R Value such as building paper and insulation... if both sides of the frame are ply then you must also include the void.

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