Dimentional lumber is one of most common structural components on any building site, and for good reason. It’s a renewable material that can offer cost advantages, it’s easily available, it can be cut and sized on-site and used in nearly any kind of construction project. Lumber, including framing studs, roofing trusses, flooring systems and solid timbers, is found throughout residential, commercial, industrial, institutional and recreational construction projects worldwide.
Machine stress-rated lumber
Where great strength is critical, such as in truss rafters, laminating stock, I-beams and web joints, machine stress-rated and machine-evaluated lumber offers consistency of performance. Machine grading measures a desired characteristic – such as bending strength or density – and ensures that the graded lumber is more precisely selected than is possible with visual grading.
Freshly sawn lumber is often too high in moisture content for some uses. Kiln drying before the lumber is shipped reduces moisture content and increases the wood’s structural integrity, appearance and workability, as well as reducing swelling and/or shrinkage. Virtually all lumber is kiln-dried to a moisture content of 19% or less.
Did you know?
Using wood in manufactured products requires far less energy than manufacturing with other materials. Most of the energy it takes comes from the wood’s residual biomass (such as bark and sawdust).
Delivering consistent quality
As an organic, natural resource, lumber varies in appearance, characteristics and quality. To ensure lumber quality, Canadian mills employ standardized, industry-wide grading for similar woods.
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.