Lumber or timber is wood in any of its stages from felling through readiness for use as structural material for construction, or wood pulp for paper production. (The distinction between the two terms is discussed below).
Lumber is supplied either rough or finished. 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. ''Finished lumber'' is supplied in standard sizes, mostly for the construction industry, primarily softwood from coniferous species including pine, fir and spruce (collectively known as Spruce-pine-fir), cedar, and hemlock, but also some hardwood, for high-grade flooring.
Note that the word lumberjack is used in the UK and Australia to refer to North Americans who fell standing trees, and so the word ''lumber'' conjures images of what North Americans call ''timber'', and vice versa.
"Timber!" is also an exclamation that lumberjacks often shout out to warn others that a cut tree is about to fall.
{|class="wikitable" style="clear:both;" |+North American softwood dimensional lumber sizes |- ! Nominal (in) ! style="border-right-style:solid; border-right-width:2px;" | Actual ! Nominal (in) ! style="border-right-style:solid; border-right-width:2px;" | Actual ! Nominal (in) ! Actual |- | 1 × 2 | style="border-right-style:solid; border-right-width:2px;" | in × in (19 mm × 38 mm) | 2 × 2 | style="border-right-style:solid; border-right-width:2px;" | in × in (38 mm × 38 mm) | 4 × 4 | in × in (89 mm × 89 mm) |- | 1 × 3 | style="border-right-style:solid; border-right-width:2px;" | in × in (19 mm × 64 mm) | 2 × 3 | style="border-right-style:solid; border-right-width:2px;" | in × in (38 mm × 64 mm) | 4 × 6 | in × in (89 mm × 140 mm) |- | 1 × 4 | style="border-right-style:solid; border-right-width:2px;" | in × in (19 mm × 89 mm) | 2 × 4 | style="border-right-style:solid; border-right-width:2px;" | in × in (38 mm × 89 mm) | 6 × 6 | in × in (140 mm × 140 mm) |- | 1 × 6 | style="border-right-style:solid; border-right-width:2px;" | in × in (19 mm × 140 mm) | 2 × 6 | style="border-right-style:solid; border-right-width:2px;" | in × in (38 mm × 140 mm) | 8 × 8 | in × in (184 mm × 184 mm) |- | 1 × 8 | style="border-right-style:solid; border-right-width:2px;" | in × in (19 mm × 184 mm) | 2 × 8 | style="border-right-style:solid; border-right-width:2px;" | in × in (38 mm × 184 mm) | | |- | 1 × 10 | style="border-right-style:solid; border-right-width:2px;" | in × in (19 mm × 235 mm) | 2 × 10 | style="border-right-style:solid; border-right-width:2px;" | in × in (38 mm × 235 mm) | | |- | 1 × 12 | style="border-right-style:solid; border-right-width:2px;" | in × in (19 mm × 286 mm) | 2 × 12 | style="border-right-style:solid; border-right-width:2px;" | in × in (38 mm × 286 mm) | | |}
Solid dimensional lumber typically is only available up to lengths of 24 ft. Engineered wood products, manufactured by binding the strands, particles, fibers, or veneers of wood, together with adhesives, to form composite materials, offer more flexibility and greater structural strength than typical wood building materials.
Pre-cut studs save a framer a lot of time as they are pre-cut by the manufacturer to be used in 8 ft, 9 ft & 10 ft ceiling applications, which means they have removed a few inches of the piece to allow for the sill plate and the double top plate with no additional sizing necessary.In the Americas, ''two-bys'' (2×4s, 2×6s, 2×8s, 2×10s, and 2×12s), along with the 4×4, are common lumber sizes used in modern construction. They are the basic building block for such common structures as balloon-frame or platform-frame housing. Dimensional lumber made from softwood is typically used for construction, while hardwood boards are more commonly used for making cabinets or furniture.
Lumber's ''nominal'' dimensions are given in terms of green (not dried), rough (unfinished) dimensions. The ''finished'' size is smaller, as a result of drying (which shrinks the wood), and planing to smooth the wood. However, the difference between "nominal" and "finished" lumber size can vary. So various standards have specified the difference between nominal size, and finished size, of lumber.
Early standards called for green rough lumber to be of full nominal dimension when dry, but the requirements have changed over time. For example, in 1910, a typical finished board was . In 1928, that was reduced by 4%, and yet again by 4% in 1956. In 1961, at a meeting in Scottsdale, Arizona, the Committee on Grade Simplification and Standardization agreed to what is now the current U.S. standard: in part, the dressed size of a 1 inch (nominal) board was fixed at inch; while the dressed size of 2 inch (nominal) lumber was ''reduced'' from inch to the now standard inch.
The move to set national standards for lumber in the United States began with publication of the American Lumber Standard in 1924, which set specifications for lumber dimensions, grade, and moisture content; it also developed inspection and accreditation programs. These standards have changed over the years to meet the changing needs of manufacturers and distributors, with the goal of keeping lumber competitive with other construction products. Current standards are set by the American Lumber Standard Committee, appointed by the Secretary of Commerce.
Design values for most species and grades of visually graded structural products are determined in accordance with ASTM standards, which consider the effect of strength reducing characteristics, load duration, safety and other influencing factors. The applicable standards are based on results of tests conducted in cooperation with the USDA Forest Products Laboratory. Design Values for Wood Construction, which is a supplement to the ANSI/AF&PA; National Design Specification® for Wood Construction, provides these lumber design values, which are recognized by the model building codes. A summary of the six published design values—including bending (Fb), shear parallel to grain (Fv), compression perpendicular to grain (Fc-perp), compression parallel to grain (Fc), tension parallel to grain (Ft), and modulus of elasticity (E and Emin) can be found in Structural Properties and Performance published by WoodWorks.
Canada has grading rules that maintain a standard among mills manufacturing similar woods to assure customers of uniform quality. Grades standardize the quality of lumber at different levels and are based on moisture content, size and manufacture at the time of grading, shipping and unloading by the buyer. The National Lumber Grades Authority (NLGA) is responsible for writing, interpreting and maintaining Canadian lumber grading rules and standards. The Canadian Lumber Standards Accreditation Board (CLSAB) monitors the quality of Canada's lumber grading and identification system.
Attempts to maintain lumber quality over time have been challenged by historical changes in the timber resources of the United States—from the slow-growing virgin forests common over a century ago to the fast-growing plantations now common in today's commercial forests. Resulting declines in lumber quality have been of concern to both the lumber industry and consumers and have caused increased use of alternative construction products
Machine stress-rated and machine-evaluated lumber is readily available for end-uses where high strength is critical, such as truss rafters, laminating stock, I-beams and web joints. Machine grading measures a characteristic such as stiffness or density that correlates with the structural properties of interest, such as bending strength. The result is a more precise understanding of the strength of each piece of lumber than is possible with visually graded lumber, which allows designers to use full-design strength and avoid overbuilding.
+ Hardwood dimensional lumber sizes | |||
! Nominal | ! Surfaced 1 Side (S1S) | ! Surfaced 2 sides (S2S) | |
in | |||
in | |||
in | |||
1 in or in | |||
in or in | |||
in or in | |||
2 in or in | |||
3 in or in | |||
4 in or in | + |
In North America, sizes for dimensional lumber made from hardwoods varies from the sizes for softwoods. Boards are usually supplied in random widths and lengths of a specified thickness, and sold by the board-foot (, th of . This does not apply in all countries, for example in Australia many boards are sold to timber yards in packs with a common profile (dimensions) but not necessarily consisting of the same length boards. Hardwoods cut for furniture are cut in the fall and winter, after the sap has stopped running in the trees. If hardwoods are cut in the spring or summer the sap ruins the natural color of the timber and decreases the value of the timber for furniture.
Also in North America, hardwood lumber is commonly sold in a "quarter" system when referring to thickness. 4/4 (four quarters) refers to a board, 8/4 (eight quarters) is a board, etc. This system is not usually used for softwood lumber, although softwood decking is sometimes sold as 5/4 (actually one inch thick).
# Laminated Veneer Lumber (LVL) – LVL comes in inch thicknesses with depths such as , , 14, 16, 18, or 24 inches, and are often doubled or tripled up. They function as beams to provide support over large spans, such as removed support walls and garage door openings, places where dimensional lumber isn't sufficient, and also in areas where a heavy load is bearing from a floor, wall or roof above on a somewhat short span where dimensional lumber isn't practical. This type of lumber cannot be altered by holes or notches anywhere within the span or at the ends, as it compromises the integrity of the beam, but nails can be driven into it wherever necessary to anchor the beam or to add hangers for I-joists or dimensional lumber joists that terminate at an LVL beam. # Wood I-Joists – Sometimes called "TJI","Trus Joists" or "BCI", all of which are brands of wood I-joists, they are used for floor joists on upper floors and also in first floor conventional foundation construction on piers as opposed to slab floor construction. They are engineered for long spans and are doubled up in places where a wall will be aligned over them, and sometimes tripled where heavy roof-loaded support walls are placed above them. They consist of a top and bottom chord/flange made from dimensional lumber with a webbing in-between made from oriented strand board (OSB). The webbing can be removed up to certain sizes/shapes according to the manufacturer's or engineer's specifications, but for small holes, wood I-joists come with "knockouts", which are perforated, pre-cut areas where holes can be made easily, typically without engineering approval. When large holes are needed, they can typically be made in the webbing only and only in the center third of the span; the top and bottom chords cannot be cut. Sizes and shapes of the hole, and typically the placing of a hole itself, must be approved by an engineer prior to the cutting of the hole and in many areas, a sheet showing the calculations made by the engineer must be provided to the building inspection authorities before the hole will be approved. Some I-joists are made with W-style webbing like a truss to eliminate cutting and allow ductwork to pass through. # Finger-Jointed Lumber – Solid dimensional lumber lengths typically are limited to lengths of 22 to 24 feet, but can be made longer by the technique of "finger-jointing" lumber by using small solid pieces, usually 18 to 24 inches long, and joining them together using finger joints and glue to produce lengths that can be up to 36 feet long in 2×6 size. Finger-jointing also is predominant in precut wall studs. It is also an affordable alternative for non-structural hardwood that will be painted (staining would leave the finger-joints visible). Care must be taken during construction to avoid nailing directly into a glued joint as stud breakage can occur. # Glu-lam Beams – Created from 2×4 or 2×6 stock by gluing the faces together to create beams such as 4×12 or 6×16. By gluing multiple, common sized pieces of lumber together, they act as one larger piece of lumber - thus eliminating the need to harvest larger, older trees for the same size beam. # Manufactured Trusses – Trusses are used in home construction as a pre-fabricated replacement for roof rafters and ceiling joists (stick-framing). It is seen as an easier installation and a better solution for supporting roofs as opposed to the use of dimensional lumber's struts and purlins as bracing. In the southern USA and other parts, stick-framing with dimensional lumber roof support is still predominant. The main drawback of trusses are reduced attic space, time required for engineering and ordering, and a cost higher than the dimensional lumber needed if the same project were conventionally framed. The advantages are significantly reduced labor costs (installation is faster than conventional framing), consistency, and overall schedule savings.
Wood with less than 25% moisture (dry weight basis) can remain free of decay for centuries. Similarly, wood submerged in water may not be attacked by fungi if the amount of oxygen is inadequate.
Fungi timber defects: # Blue stain # Brown rot # Dry rot # Heart rot # Sap stain # Wet rot # White rot
There are four recommended methods to protect wood-frame structures against durability hazards and thus provide maximum service life for the building. All require proper design and construction:
1. Control moisture using design techniques to avoid decay. 2. Provide effective control of termites and other insects. 3. Use durable materials such as pressure treated or naturally durable species of wood where appropriate. 4. Provide quality assurance during design and construction and throughout the building’s service life using appropriate maintenance practices.
The primary objective when addressing moisture loads is to keep water from entering the building envelope in the first place, and to balance the moisture content within the building itself. Moisture control by means of accepted design and construction details is a simple and practical method of protecting a wood-frame building against decay. Finally, for applications with a high risk of staying wet, designers should specify durable materials such as naturally decay-resistant species or wood that’s been treated with preservatives. Cladding, shingles, sill plates and exposed timbers or glulam beams are examples of potential applications for treated wood.
• Grade the building site away from the foundation to provide proper drainage. • Cover exposed ground in any crawl spaces with 6-mil polyethylene film and maintain at least 12 to 18 inches of clearance between the ground and the bottom of framing members above (12 inches to beams or girders, 18 inches to joists or plank flooring members). • Support post columns by concrete piers so there’s at least six inches of clear space between the wood and exposed earth. • Install wood framing and sheathing in exterior walls at least eight inches above exposed earth; locate siding at least six inches from the finished grade. • Where appropriate and desired, ventilate crawl spaces according to local building codes. • Remove building material scraps from the job site before backfilling. If termites are found, eliminate their nests. • If allowed by local regulation, treat the soil around the foundation with an approved termiticide to provide protection against subterranean termites.
To avoid decay and termite infestation, it is important to separate untreated wood from the ground and other sources of moisture. These separations are required by many building codes and are considered necessary to maintain wood elements in permanent structures at a safe moisture content for decay protection. When it is not possible to separate wood from the sources of moisture, designers often rely on preservative-treated wood.
Wood can be treated with a preservative that improves service life under severe conditions without altering its basic characteristics. It can also be pressure-impregnated with fire-retardant chemicals that improve its performance in a fire. One of the early treatments to ''fireproof lumber'' which retard fires was developed in 1936 by Protexol Corporation in which lumber is heavily treated with salt. Wood does not deteriorate just because it gets wet. When wood breaks down, it is because an organism is eating it as food. Preservatives work by making the food source inedible to these organisms. Properly preservative-treated wood can have 5 to 10 times the service life of untreated wood. Preserved wood is used most often for railroad ties, utility poles, marine piles, decks, fences and other outdoor applications. Various treatment methods and types of chemicals are available, depending on the attributes required in the particular application and the level of protection needed.
There are two basic methods of treating: with and without pressure. Non-pressure methods are the application of preservative by brushing, spraying or dipping the piece to be treated. Deeper, more thorough penetration is achieved by driving the preservative into the wood cells with pressure. Various combinations of pressure and vacuum are used to force adequate levels of chemical into the wood. Pressure-treating preservatives consist of chemicals carried in a solvent. Chromated copper arsenate (CCA), once the most commonly used wood preservative in North America began being phased out of most residential applications in 2004. Replacing it are amine copper quat (ACQ) and copper azole (CA).
All wood preservatives used in the U.S. and Canada are registered and regularly re-examined for safety by the U.S. Environmental Protection Agency and Health Canada's Pest Management and Regulatory Agency, respectively.
One of the most conventional framing methods is the ''Neumann Notch'', which involves a thirty-two degree angling of adjoining lumber and then a right-angled wedge with an eighteen degree cusp fitted between the lumber before being bolted. This convention was pioneered by Daniel R. Neumann, a carpenter from Germany, that was responsible for the structural development of the Massachusetts Bay Colony in 1630. This framing convention spread to construction sites in other colonies, most famously Plymouth and Concord. Neumann's notched framing then was adopted by carpenters and construction companies and this framing convention is still used today in traditional frame sets.
Another somewhat less conventional method for framing is known as the "New-style" binding. The basic setup of the New-style binding was developed by Austin D. New, a Mormon settler in Salt Lake City, Utah during the 1800s. The basic structure of the New-style binding involves a set-up of two similar sized logs set against each other perpendicularly and lashed together with hemp rope. This technique was used to construct many of the early houses of the Mormon settlers due to its ease of use and durability. Eventually the New-style binding became obsolete as the settlers began constructing homes out of the more traditional brick and mortar.
The U.S. and Canadian governments both support an increased role for energy derived from biomass, which are organic materials available on a renewable basis and include residues and/or byproducts of the logging, sawmilling and papermaking processes. In particular, they view it as a way to lower greenhouse gas emissions by reducing consumption of oil and gas while supporting the growth of forestry, agriculture and rural economies. Studies by the U.S. government have found the country’s combined forest and agriculture land resources have the power to sustainably supply more than one-third of its current petroleum consumption.
Three potentially large sources of forest biomass currently not being used in abundance are harvesting residues, particularly those left at the roadside, thinning treatments done in conjunction with efforts to reduce forest fire hazards (mostly in the U.S.), and salvage and recovery of beetle-killed timber (mostly in Canada).
Biomass is already an important source of energy for the North American forest products industry. It is common for companies to have cogeneration facilities, also known as combined heat and power, which convert some of the biomass that results from wood and paper manufacturing to electrical and thermal energy in the form of steam. The electricity is used to, among other things, dry lumber and supply heat to the dryers used in paper-making.
Resawing is the process of splitting 1 inch through 12 inch hardwood or softwood lumber into two or more thinner pieces of full length boards. For example, splitting a ten foot 2x4 into two ten foot 1x4s is considered resawing.
In addition to resawing lumber, remanufactured lumber can be ''ripped'' on a ripsaw using single or multiple blades. Ripping is the process of splitting 1" through 12" hardwood or softwood lumber into two or more narrower pieces of full length boards. For example, splitting a ten foot 2x4 into two ten foot 2x2s is considered ripping.
Category:Forestry Category:Timber industry Category:Wood
da:Tømmer de:Bauholz fa:الوار fr:Bois (matériau de construction) hi:इमारती लकड़ी it:Legname no:Tømmer nn:Tømmer pl:Tarcica qu:K'ullu ru:Бревно simple:Lumber fi:Puutavara sv:Timmer uk:ПиломатеріалиThis text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
name | Timber Timbre |
---|---|
landscape | yes |
background | group_or_band |
origin | Toronto, ON and Montréal, QC |
genre | Folk, blues |
years active | –present |
label | Arts & Crafts, Out of This Spark |
website | |
current members | Taylor KirkSimon TrottierMika Posen }} |
Timber Timbre is a Canadian folk music project, featuring Mika Posen, Simon Trottier and Taylor Kirk. The moniker refers to an early series of recordings made in a timber-framed cabin set in the wooded outskirts of Bobcaygeon, Ontario.
Timber Timbre released two albums independently before releasing a self-titled album on Out of This Spark in January 2009. He subsequently signed to Arts & Crafts, who re-released the album on June 30 in Canada and July 28 internationally. The album was named as a longlist nominee for the 2009 Polaris Music Prize on June 15, 2009, and was deemed album of the year by ''Eye Weekly''.
The band's song "Magic Arrow" was featured in the television show ''Breaking Bad'', in the episode "Caballo Sin Nombre."
On June 16, 2011, the band's fourth album *''Creep On Creepin' On'' was named as a longlisted nominee for the 2011 Polaris Music Prize. On July 6, the album was named as a short listed (one of ten) nominee for the 2011 award.
Category:Musicians from Toronto Category:Living people Category:Canadian indie rock musicians Category:Canadian folk rock groups Category:Musical groups from Toronto Category:Arts & Crafts (record label) artists
fr:Timber TimbreThis text is licensed under the Creative Commons CC-BY-SA License. This text was originally published on Wikipedia and was developed by the Wikipedia community.
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