For slabs on corrugated metal forms: figure the amount of corrugated formwork needed by taking the area of the slab plus 7 percent for lap and waste. The edge forms are listed by the height required in total lineal feet for each height. The finish area is the exact slab area to the closest 10 feet for convenience. The concrete volume is the slab area times the thickness of the slab, including to the bottom of the corrugations in the form, if the specifications show 2 inches of concrete above the top of the corrugations, figure one-half inch for the corrugations, or figure the slab as two and one-half inches thick. Include the corrections in your figuring as if they were solid concrete. This will cover waste and possible sag in the form material. For stairs on fill: the takeoff items to consider here are sand fill, form risers, finish treads and risers, and concrete. For shored stairs, take off everything except the sand. Shored stair landings are taken off at the same time as shored stairs. For pan-fill stairs only finishing and concrete fill are take off. All stairs are taken off by the lineal feet of risers. If a stair has eight risers that are 4 feet long, it has 32 lineal feet of risers. To takeoff the concrete in a stair, figure 1 cubic foot per lineal foot of riser. At this point all of the main concrete work has been taken off from both the structural and the architectural drawings. Now, we must search out the less obvious items of concrete by looking through the drawings starting with the first drawing. On each drawing, check each section for concrete not taken off before like mechanical equipment bases and locker bases. These items will all have forms, finishing and concrete to takeoff and recap for pricing. Exterior sidewalks and exterior paving are taken from-and checked off on- the site plan. The area of the sidewalks will first give you the are of hand grading of sub-grade required. This area times the sand fill depth will give you the sand fill volume in cubic yards, but to this you must add 25 percent for compaction and loss. The concrete is the area of the walks times the depth put in to cubic yards.