Lumber

Lumber, also call as timber, is wood that has been processed into beams & planks, the stage in the process of wood production. Lumber is mainly used for structural purposes but has numerous other uses as well.

Lumber may be supplied either rough-sawn, or surfaced on one or more of its faces. besides pulpwood, rough lumber is the raw fabric for furniture-making, together with manufacture of other items requiring cutting and shaping. It is usable in many species, including hardwoods and softwoods, such as white pine and red pine, because of their low cost.

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. this is the more usually made from softwood than hardwoods, and 80% of lumber comes from softwood.

Terminology

In the United States and Canada, milled boards are called lumber, while timber describes standing or felled trees.

In contrast, in Britain, many other Commonwealth nations and Ireland, the term timber is used in both senses. The word lumber is rarely used in representation to wood and has several other meanings.

Re-manufactured lumber is the total of secondary or tertiary processing of ago milled lumber. Specifically, it forwarded to lumber array for industrial or wood-packaging use. Lumber is positioning by ripsaw or resaw to hold dimensions that are not ordinarily 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 delivered from recycled plastic and new plastic stock. Its intro has been strongly opposed by the forestry industry. Blending fiberglass in plastic lumber enhances its strength, durability, and fire resistance. Plastic fiberglass structural lumber can draw a "class 1 flame spread rating of 25 or less, when tested in accordance with ASTM requirements E 84," which means it burns more slowly than almost all treated wood lumber.