Video: Lumber | Wikipedia audio article

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00:01:07 1 Terminology
00:01:38 1.1 Remanufactured lumber
00:02:24 1.2 Plastic lumber
00:03:06 2 Conversion of wood logs
00:04:14 3 Dimensional lumber
00:06:02 3.1 Historical Chinese construction
00:07:20 3.2 North American softwoods
00:11:04 3.3 Grades and standards
00:15:34 3.4 North American hardwoods
00:18:34 3.5 Engineered lumber
00:23:09 3.6 Various pieces and cuts
00:23:54 3.7 Timber piles
00:24:25 4 Defects in lumber
00:24:40 4.1 Conversion
00:25:16 4.2 Defects due to fungi and animals
00:26:27 4.3 Natural forces
00:27:37 4.4 Seasoning
00:27:56 5 Durability and service life
00:29:18 5.1 Moisture control
00:30:50 5.2 Controlling termites and other insects
00:32:14 5.3 Preservatives
00:34:50 6 Timber framing
00:35:23 7 Environmental effects of lumber
00:35:58 7.1 Residual wood
00:37:24 8 See also

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SUMMARY
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Lumber (North American English) or timber (used in the rest of the English-speaking world) is a type of wood that has been processed into beams and planks, a stage in the process of wood production. Lumber is mainly used for structural purposes but has many other uses as well.
There are two main types of lumber. It 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 other items requiring additional cutting and shaping. It is available in many species, usually hardwoods; but it is also readily available in 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. It is more commonly made from softwood than hardwoods, and 80% of lumber comes from softwood.

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