22168
glossary-template-default,single,single-glossary,postid-22168,stockholm-core-1.0.9,select-theme-ver-5.1.6,ajax_fade,page_not_loaded,menu-animation-underline,wpb-js-composer js-comp-ver-6.0.5,vc_responsive
Title Image

Lumber

Lumber

The product of the saw and planing mill for which manufacturing is limited to sawing, resawing, passing lengthwise through a standard planing machine, crosscutting to length, and matching. Lumber is simply solid wood that has been sawn to a particular size. Traditionally produced from very large diameter logs, lumber is now often made from logs as small as 8 to 12 inches (20 to 30 cm) in diameter. Lumber is always measured, bought, and sold based on nominal, rather than actual, sizes. Measurements are affected by moisture content and, in the case of hardwoods, by whether boards are surfaced or unsurfaced.
Boardlumber that is less than 38mm standard (2in. nominal) thickness and greater than 38mm standard (2in. nominal) width.
Dimension – lumber with a thickness from 38mm standard (2 in. nominal) up to but not including 114mm standard (5 in. nominal)and a width of greater than 38mm standard (2 in. nominal).
Dressed size – Dimensions after being surfaced with a planing machine. The dressed size is usually ½ – ¾ in. less than the nominal or rough size.
Factory and shop lumberlumber intended to be cut up for use in further manufacture. It is graded on the percentage of the area that will produce a limited number of cuttings of a specified minimum size and quality.
Nominal size – As applied to timber or lumber, the size of which it is known and sold in the market (often differs from the actual size).
Rough lumberlumber that has not been dressed (surfaced) but has been sawed, edged, and trimmed.
Shipping-dry lumberlumber that is partially dried to prevent stain and mold in transit.
Side lumber – a board from the outer portion of the log – ordinarily one produced when squaring off a log for a tie or timber.
Structural lumberlumber that is intended for use where allowable properties are required. The grading is based on the strength of stiffness of the piece as related to anticipated uses.
Timbers – lumber that is standard 114mm (nominal 5 in.) or more in least dimension. Timbers may be used as beams, stringers, posts, caps, sills, girders, or purlins.
Yard lumberlumber of all sizes and patterns that is intended for general building purposed having no design property requirements.