Lumber may be supplied either rough-sawn, or surfaced on one or more of its faces. Besides pulpwood, rough lumber is the raw material for furniture-making, and manufacture of other items requiring cutting and shaping. It is available in many species, including hardwoods and softwoods, such as white pine and red pine, because of their low cost.[1]
Finished lumber is supplied in standard sizes, mostly for the construction industry – primarily softwood, from coniferous species, including pine, fir and spruce (collectively spruce-pine-fir), cedar, and hemlock, but also some hardwood, for high-grade flooring. It is more commonly made from softwood than hardwoods, and 80% of lumber comes from softwood.Re-manufactured lumber is the result of secondary or tertiary processing of previously milled lumber. Specifically, it refers to lumber cut for industrial or wood-packaging use. Lumber is cut by ripsaw or resaw to create dimensions that are not usually processed by a primary sawmill.
Re-sawing is the splitting of 25 by 300 millimetres (1 by 12 in) hardwood or softwood lumber into two or more thinner pieces of full-length boards. For example, splitting a 3-metre (10 ft) long 50 by 100 mm (2 by 4 in) into two 25 by 100 mm (1 by 4 in) of the same length is considered re-sawing.Structural lumber may also be produced from recycled plastic and new plastic stock. Its introduction has been strongly opposed by the forestry industry.[4] Blending fiberglass in plastic lumber enhances its strength, durability, and fire resistance.[5] Plastic fiberglass structural lumber can have a "class 1 flame spread rating of 25 or less, when tested in accordance with ASTM standard E 84," which means it burns more slowly than almost all treated wood lumberBecause working expensive hardwoods is far more difficult and costly, and because an odd width might well be conserved and be of use in making such surfaces as a cabinet side or tabletop joined from many smaller widths, the industry generally only does minimal processing, preserving as much board width as is practicable. This leaves culling and width decisions totally in the hands of the craftsman building cabinets or furniture with the boards.
In quarter sawn thicknesses, meaning the thickness and width dimensions as they come out of the sawmills table. Because lengths vary most with temperature, hardwoods boards in the US often have a bit of extra length.
small set of specified lengths: Fixed-length hardwood boards in the United States are most common in 4–6 ft (1.2–1.8 m) lengths, with a good representation of 8 ft (2.4 m) lengths in a variety of widths, and a few widths with occasional dimensional sizes to 12 ft (3.7 m) lengths. Often the longer sizes need be special ordered.
Fixed board lengths do not apply in all countries; for example, in Australia and the United States, many hardwood boards are sold to timber yards in packs with a common width profile (dimensions) but not necessarily consisting of boards of identical lengths.
Answers & Comments
Answer:
Lumber may be supplied either rough-sawn, or surfaced on one or more of its faces. Besides pulpwood, rough lumber is the raw material for furniture-making, and manufacture of other items requiring cutting and shaping. It is available in many species, including hardwoods and softwoods, such as white pine and red pine, because of their low cost.[1]
Finished lumber is supplied in standard sizes, mostly for the construction industry – primarily softwood, from coniferous species, including pine, fir and spruce (collectively spruce-pine-fir), cedar, and hemlock, but also some hardwood, for high-grade flooring. It is more commonly made from softwood than hardwoods, and 80% of lumber comes from softwood.Re-manufactured lumber is the result of secondary or tertiary processing of previously milled lumber. Specifically, it refers to lumber cut for industrial or wood-packaging use. Lumber is cut by ripsaw or resaw to create dimensions that are not usually processed by a primary sawmill.
Re-sawing is the splitting of 25 by 300 millimetres (1 by 12 in) hardwood or softwood lumber into two or more thinner pieces of full-length boards. For example, splitting a 3-metre (10 ft) long 50 by 100 mm (2 by 4 in) into two 25 by 100 mm (1 by 4 in) of the same length is considered re-sawing.Structural lumber may also be produced from recycled plastic and new plastic stock. Its introduction has been strongly opposed by the forestry industry.[4] Blending fiberglass in plastic lumber enhances its strength, durability, and fire resistance.[5] Plastic fiberglass structural lumber can have a "class 1 flame spread rating of 25 or less, when tested in accordance with ASTM standard E 84," which means it burns more slowly than almost all treated wood lumberBecause working expensive hardwoods is far more difficult and costly, and because an odd width might well be conserved and be of use in making such surfaces as a cabinet side or tabletop joined from many smaller widths, the industry generally only does minimal processing, preserving as much board width as is practicable. This leaves culling and width decisions totally in the hands of the craftsman building cabinets or furniture with the boards.
In quarter sawn thicknesses, meaning the thickness and width dimensions as they come out of the sawmills table. Because lengths vary most with temperature, hardwoods boards in the US often have a bit of extra length.
small set of specified lengths: Fixed-length hardwood boards in the United States are most common in 4–6 ft (1.2–1.8 m) lengths, with a good representation of 8 ft (2.4 m) lengths in a variety of widths, and a few widths with occasional dimensional sizes to 12 ft (3.7 m) lengths. Often the longer sizes need be special ordered.
Fixed board lengths do not apply in all countries; for example, in Australia and the United States, many hardwood boards are sold to timber yards in packs with a common width profile (dimensions) but not necessarily consisting of boards of identical lengths.
Explanation:
don't forget to brainliest me
#hopeitshelpsyou
#keeponlearning