Editing Lumber (section)

==Terminology==
In the United States and Canada, milled boards are called ''lumber'', while ''timber'' describes standing or felled trees.<ref name="CRD">{{cite web|title=Conceptual Reference Database for Building Envelope Research|url=http://alcor.concordia.ca/~raojw/crd/concept/concept000069.html|access-date=2008-03-28|url-status=dead|archive-url=https://web.archive.org/web/20080223221704/http://alcor.concordia.ca/~raojw/crd/concept/concept000069.html|archive-date=2008-02-23}}</ref>

In contrast, in Britain, and some other Commonwealth nations and Ireland, the term ''[[wikt: timber|timber]]'' is used in both senses. (In the UK, the word ''lumber'' is rarely used in relation to wood and has several other meanings.)

===Re-manufactured lumber===
{{See also|Timber recycling}}
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 {{convert|1|to(-)|12|in|adj=on}} [[hardwood]] or [[softwood]] lumber into two or more thinner pieces of full-length boards. For example, splitting a {{convert|10|ft||adj=mid|-long}} 2×4 ({{cvt|1+1/2|by|3+1/2|in|disp=or}}) into two 1×4s ({{cvt|3/4|by|3+1/2|in|disp=or}}) of the same length is considered re-sawing.

===Plastic lumber===
{{Further|Plastic lumber|Fiber-reinforced composite|Wood-plastic composite}}
Structural lumber may also be produced from recycled plastic and new plastic stock. Its introduction has been strongly opposed by the [[forestry]] industry.<ref>[http://www.volokh.com/sasha/resrec.html "Recycling and Deregulation: Opportunities for Market Development"] ''Resource Recycling,'' September 1996</ref> Blending fiberglass in plastic lumber enhances its strength, durability, and fire resistance.<ref>[http://www.astm.org/COMMIT/SUBCOMMIT/D2020.htm "ASTM D6108 – 09 Standard Test Method for Compressive Properties of Plastic Lumber and Shapes"] ''ASTM Committee D20.20 on Plastic Lumber''</ref> 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 lumber.<ref>[http://www.strongwell.com/PDFfiles/Safdeck%20Safplank/SAFPLANK%20SAFDECK%20Fiberglass%20Decking%20Systems%20Brochure.pdf "SAFPLANK Interlocking Decking System"] {{webarchive|url=https://web.archive.org/web/20130426205658/http://www.strongwell.com/PDFfiles/Safdeck%20Safplank/SAFPLANK%20SAFDECK%20Fiberglass%20Decking%20Systems%20Brochure.pdf |date=2013-04-26 }} ''Strongwell.com''</ref>

=== Timber mark ===
A timber mark is a code beaten on to cut wood by a specially made hammer to show the logging licence.<ref>{{Cite web |date=2024-09-06 |title=Drax, subsidies, greenwashing and dodgy accounting |url=https://redgreenlabour.org/2024/09/06/drax-subsidies-greenwashing-and-dodgy-accounting/ |access-date=2024-10-03 |website=Red Green Labour |language=en-US}}</ref>