An R30 requires 12". You will need to look into the spray foam installation. I think it will need to be around 8 to 10" for an R38.
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The volume of a cylinder 1.5 inches in diameter x 36 inches high is 63.62 cubic inches.
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High density foam is just your typical foam. It does not conform to your body when it heats up like memory foam does.
Its volume: 0.5*7*5*10 = 175 cubic inches.
74.42 gallons.