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The board foot or board-foot is a unit of measurement for the volume of lumber in the United States and Canada. [1] It equals the volume of a board that is one foot (30.5 cm) in length, one foot in width, and one inch (2.54 cm) in thickness, or exactly 2.359 737 216 liters .
Finger-jointed lumber – solid dimensional lumber lengths typically are limited to lengths of 22 to 24 feet (6.7–7.3 m), but can be made longer by the technique of "finger-jointing" by using small solid pieces, usually 18 to 24 inches (460–610 mm) long, and joining them together using finger joints and glue to produce lengths that can be ...
In 1950, the United States produced 38 billion board feet of lumber, and that number remained fairly constant throughout the decades moving forward, with the national production at 32.9 billion board feet in 1960 and 34.7 billion board feet in 1970. [61]
The Christiania standard was 5 ⁄ 8 of the Petersburg standard, making it 103.125 cubic feet. [3] The Swedish standard hundred was 121 boards of 14 feet long, 3 inches thick and 9 inches wide, making 317.625 cubic feet. [5] The Norwegian standard hundred was 120 boards of 12 feet long, 3 inches thick and 9 inches wide, making 270 cubic feet. [5]
The wood is categorized as a board if its width is less than 2 + 1 ⁄ 2 in (64 mm), and its thickness is less than 1 + 1 ⁄ 2 in (38 mm). A plank used in a building as a horizontal supporting member that runs between foundations, walls, or beams to support a ceiling or floor is called a joist .
Fiberboard, classified by ASTM C208, Standard Specification for Cellulosic Fiber Insulating Board, [4] has many benefits and is used in residential and commercial construction. Applications include: sound proofing/deadening; structural sheathing; low-slope roofing; sound deadening flooring underlayment
Hardboard is similar to particle board and medium-density fiberboard, but is denser, stronger and harder because it is made out of exploded wood fibers that have been highly compressed. [ 3 ] The density of hardboard is higher than 500 kg/m 3 (31 lb/cu ft), [ 4 ] usually about 800–1,040 kg/m 3 (50–65 lb/cu ft). [ 5 ]
This 5 ⁄ 16 inch (7.9 mm) thick cement board is designed as an underlayment for tile floors. These are 3-by-5-foot (91 by 152 cm) sheets. A cement board is a combination of cement and reinforcing fibers formed into sheets, of varying thickness that are typically used as a tile backing board. [1]