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The National Hardwood Lumber Association (NHLA) was founded on April 8, 1898 in Chicago, Illinois to establish uniformity of inspecting hardwood lumber.The NHLA is now a membership-based trade association that serves two main purposes: to stimulate economic activity and to provide a vehicle for the members to collectively strive for mutual benefit.
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 3 ⁄ 4 inch; while the dressed size of 2 inch (nominal) lumber was reduced from 1 + 5 ⁄ 8 inch to the current 1 + 1 ⁄ 2 inch.
For firewood, this is not an issue but for woodworking purposes, high stresses will cause the wood to crack and be unusable. Normal drying times to obtain minimal seasoning checks (cracks) in 25 mm (1 inch or 4/4 lumber) Red Oak ranges from 22 to 30 days, and in 8/4, (50 mm or 2 inch) it will range from 65 to 90 days.
The strands in PSL are clipped veneer elements having a least dimension of not more than 1 ⁄ 4 inch (6.4 mm) and an average length of at least 300 times this least dimension (around 6 ft or 1.8 m). [1] It is a member of the structural composite lumber (SCL) family of engineered wood products. [1]
Durability class 1–3, according to European Standard EN 350-2, can be obtained out of non durable (class 5) softwood species. [13] The main disadvantage is that the strength is decreased as a result of the high temperatures. In general the bending strength is reduced up to 30% with more reduction at higher temperatures. [14]
The depth obtained during regular steeping periods varies from 5 to 10 mm (0.20 to 0.39 in) up to 30 mm (1.2 in) by sap pine. Due to the low absorption, solution strength should be somewhat stronger than that in pressure processes, around 5% for seasoned timber and 10% for green timber (because the concentration slowly decreases as the ...
In 1971 "Micro=Lam LVL" was introduced. "Micro=Lam LVL" consisted of laminated veneer lumber billets 4 feet (1.2 m) wide, 3 + 1 ⁄ 2 inches (89 mm) thick, and 80 feet (24 m) long. Troutner proved the structural capabilities of his Micro=Lam product by building a house in Hagerman, Idaho, using beams made of Micro=Lam.
Quarter-sawn boards have greater stability of form and size with less cupping (compared to flatsawn boards), shrinkage across the width, shake and splitting, and other good qualities. [1] In some woods such as oak , the wood grain produces a decorative effect which shows a prominent ray fleck, while sapele is likely to produce a ribbon figure .