260 Section 2 Foundations and Framing number of pieces of each length. For example, a complete estimate might be one of the following: Required floor joists: 20 pcs – 1 3/4″ × 9 1/2″× 28′-0″ I-joists 12 pcs – 1 3/4″ × 9 1/2″ × 32′-0″ I-joists 2 pcs. – 1 3/4″ × 9 1/2″ × 14′-0″ I-joists Required joist headers: 2 pcs. – 1 1/4″ × 9 1/2″ × 20′-0″LVL rim board 2 pcs. – 1 1/4″ × 9 1/2″ × 12′-0″ LVL rim board 1 pc. – 1 1/4″ × 9 1/2″ × 8′-0″ LVL rim board for header For solid wood: 40 pcs.—2 × 10 × 16′-0″ 36 pcs.—2 × 10 × 14′-0″ Required band joists: 4 pcs.—2 × 10 × 16′-0″ 2 pcs.—2 × 10 × 12′-0″ Procedures for estimating the subflooring vary, depending on the type of material used. Usually the area is calculated by multiplying the overall length and width and then subtract- ing major areas that are not to be covered. These include breaks in the wall line and openings for stairs, fireplaces, and other items. This will deter- mine the net area and the basic amount of mate- rial needed. Waste and other extras should be considered and added to this. When using sheet materials, there is prac- tically no waste. The net area is divided by 32 (number of sq. ft. in a 4 × 8 sheet) and rounded out to the next whole number. This is the required number of pieces of OSB or plywood. Be sure to specify the type of sheet material, its thickness, and its span rating. Pro Tip An alternative and more complete method of specifying plywood, as recommended by the APA, is provided in Chapter 3, Building Materials. Copyright Goodheart-Willcox Co., Inc.