Lumber
In the United States and Canada, milled boards are called lumber while timber describes standing or felled trees. This distinction creates immediate confusion for travelers crossing the border into Britain where the term timber is used in both senses. In the UK, Australia, and New Zealand, the word lumber rarely refers to wood at all and instead carries several other meanings entirely. A construction worker in Vancouver might order a 2x4 from a supplier who expects dimensional lumber. The same worker traveling to London would find that their British counterpart orders timber for the exact same structural component. This linguistic split dates back to the 17th century when the definition of lumber as sawn planks originated specifically in North America. The harbor of Bellingham, Washington, filled with logs in 1972 illustrates how raw material flows differently depending on regional naming conventions. Rough lumber serves as the raw material for furniture-making and manufacturing items requiring cutting and shaping. Finished lumber supplies standard sizes primarily for the construction industry including floors, wall panels, and window frames. Eighty percent of all lumber comes from softwood species like pine, fir, spruce, cedar, and hemlock. Hardwoods such as white pine and red pine appear less frequently because they cost more to process.
Cornelis Corneliszoon van Uitgeest invented the first wind-powered sawmill in 1593 while operating from his home in Uitgeest. This Dutch inventor made the conversion of logs into planks thirty times faster than previous manually operated sawmills could manage. Before this mechanical revolution, workers relied on hand tools to shape wood into usable beams and boards. The archipelago of Madeira was colonized by the Portuguese Empire in 1420 when Prince Henry the Navigator sent settlers to clear huge expanses of forest. Those felled trees were processed at early sawmills before being shipped to the mainland. Plain sawn lumber runs grain across the width of boards without adjusting log position during cutting. Quarter sawn and rift sawn methods produce lumber where annual rings stand reasonably perpendicular to the sides. Boxed heart timber keeps the pith within the beam with some allowance for exposure. Free of knots lumber contains no knots whatsoever which makes it ideal for high-grade applications. Logs convert into lumber through sawing, hewing, or splitting depending on available technology and desired output quality. A sawmill with floating logs in Kotka, Finland demonstrates how modern facilities handle raw material intake today.
The American Lumber Standard published its first specifications for dimensions, grade, and moisture content in 1924. Current standards are set by the American Lumber Standard Committee appointed by the U.S. Secretary of Commerce. In 1961, the Committee on Grade Simplification and Standardization agreed to what remains the current U.S. standard for dimensional lumber. A typical finished board measured 3/4 inch thick after drying and planing while nominal dimensions remained larger. Popular Mechanics magazine hired an independent agency in 1964 to test comparative strength across multiple sample sizes. Sample A represented a full-size 2x4 inch board while samples B, C, and D reflected progressively smaller actual dimensions. Sample A's compressive strength benchmarked at 100 percent while sample D reached only 73.6 percent of that strength. The reduction from 3/4 inch to 5/8 inch reduced compressive strength by 10.46 percent according to those tests. Canada maintains grading rules through the National Lumber Grades Authority which writes and interprets Canadian lumber grading standards. The Canadian Lumber Standards Accreditation Board monitors quality within Canada's lumber grading system using CLS abbreviations. European strength grading follows EN-14081 standards with classes like C16, C18, C24, and C30 for softwoods. These numbers refer to required fifth percentile bending strength in newtons per square millimeter. African and South American sawn lumber grades developed by ATIBT follow Clearcutting rules based on percentage of clear surface area.
Laminated veneer lumber comes in thicknesses such as 19 mm with depths reaching 240 mm or more. These engineered products function as beams providing support over large spans where dimensional lumber proves insufficient. Wooden I-joists sometimes called Trus Joists or BCI serve as floor joists for upper floors and foundation construction. They consist of top and bottom chords made from dimensional lumber with webbing between them constructed from oriented strand board. Finger-jointed lumber joins small solid pieces usually 1 meter long together using glue to produce lengths up to 6 meters. Glulam beams create larger structural elements by gluing faces of 2x4 or 2x6 stock together into beams like 4x12 or 6x16. Manufactured trusses replace roof rafters and ceiling joists as pre-fabricated replacements for stick-framing methods. The southern United States still uses stick-framing with dimensional lumber roof support despite these alternatives. Engineered wood products offer greater flexibility and structural strength than typical wood building materials through binding strands, particles, fibers, or veneers with adhesives. A 2002 record shows the longest plank in the world measures 35 meters and sits near Szymbark, Poland.
Fungi attack wood when moisture content exceeds 25 percent on a dry-weight basis while oxygen remains present and temperatures stay warm. Wood with less than 25 percent moisture can remain free of decay for centuries if conditions hold steady. Blue stain, brown rot, dry rot, heart rot, sap stain, wet rot, and white rot represent common fungal defects. Woodboring beetles, marine borers, termites, carpenter ants, and carpener bees cause insect damage to timber and lumber. Ring shake occurs when wood grain separates around growth rings either while standing or during felling operations. Eastern hemlock is known specifically for having ring shake which reduces both strength and appearance. Checks form cracks on the surface caused by outside timber shrinking as it seasons toward the pith. Splits go all the way through a timber piece and occur more frequently at ends due to rapid drying there. Chromated copper arsenate once served as the most commonly used wood preservative in North America before phasing out in 2004. Amine copper quat and copper azole now replace older treatments in residential applications. Pressure-treating preservatives consist of chemicals carried in solvents that force adequate levels into wood cells. Properly preserved wood achieves five to ten times the service life of untreated wood according to industry standards.
Cement and concrete manufacture generates approximately 8 percent of global greenhouse gas emissions annually. Iron and steel production accounts for another 5 percent of those same global emissions figures. One cubic meter of lumber sequesters roughly one tonne of CO2 according to recent studies. Building materials and construction make up 11 percent of global greenhouse gas emissions overall. Mass timber buildings construct themselves roughly 25 percent faster than concrete alternatives while requiring 90 percent less construction traffic. About 67 percent of wood waste from municipal solid waste landfills while 16 percent incinerates with energy recovery. Construction and demolition waste makes up 52 percent of total timber waste collected in the United Kingdom according to 2020 data. The United States, United Kingdom, Uzbekistan, Kazakhstan, Australia, Fiji, Madagascar, Mongolia, Russia, Denmark, Switzerland, and Eswatini all support increased roles for biomass-derived energy. Residual wood converts to thermal energy through cogeneration facilities producing electrical and thermal power as steam. Studies show manufacturing wood uses less energy and results in less air and water pollution than steel or concrete alternatives. Wood serves as a natural insulator making it particularly effective for windows and doors in building design.
Common questions
What is the difference between lumber and timber in the United States and Canada?
In the United States and Canada, milled boards are called lumber while timber describes standing or felled trees. This distinction creates immediate confusion for travelers crossing the border into Britain where the term timber is used in both senses.
When did Cornelis Corneliszoon van Uitgeest invent the first wind-powered sawmill?
Cornelis Corneliszoon van Uitgeest invented the first wind-powered sawmill in 1593 while operating from his home in Uitgeest. This Dutch inventor made the conversion of logs into planks thirty times faster than previous manually operated sawmills could manage.
Which species make up eighty percent of all lumber produced today?
Eighty percent of all lumber comes from softwood species like pine, fir, spruce, cedar, and hemlock. Hardwoods such as white pine and red pine appear less frequently because they cost more to process.
How does moisture content affect wood decay and fungal attacks?
Fungi attack wood when moisture content exceeds 25 percent on a dry-weight basis while oxygen remains present and temperatures stay warm. Wood with less than 25 percent moisture can remain free of decay for centuries if conditions hold steady.
What percentage of global greenhouse gas emissions does cement manufacture generate annually?
Cement and concrete manufacture generates approximately 8 percent of global greenhouse gas emissions annually. Iron and steel production accounts for another 5 percent of those same global emissions figures.