<p>This Architectural Drawing is AutoCAD 2d drawing of Roof slope details in AutoCAD, dwg file. Roof slope is the incline of the roof. <strong>It is expressed as a ratio of vertical rise to horizontal run, and tells you how many inches the roof rises for every twelve inches in depth</strong>. The higher the rise, the steeper the roof is. The measurement ratio is always expressed as inches per foot.</p>