Determine the deadweight of a 1 -ft-long segment of a typical 20-in-wide unit of a roof supported on a nominal \(2 \times 16\) in. southern pine beam (the actual dimensions are \(\frac{1}{2} \mathrm{in}\). smaller). The \(\frac{3}{4}\)-in. plywood weighs \(3 \mathrm{lb} / \mathrm{ft}^{2}\).

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2" insulation 1 1/2 20" three ply felt tar and gravel 151/2" Section 20" 3/4" plywood