 The first weekly issue each month contains a table of cement, ready-mix concrete, and aggregate (crushed stone) prices, the second weekly issue contains a table of pipe prices, the third issue contains lumber, plywood, drywall, and insulation prices, and the fourth issue contains steel and other metal product prices.A small amount of this data is then used to calculate two monthly index figures, the Construction Cost Index and the Building Cost Index.Both indexes are calculated using a formula made up of fixed amounts of four components—Portland cement, 2x4 lumber, structural steel (steel beams), and labor.