Laminated Veneer Lumber Inspection and Checklist
Laminated Veneer Lumber (LVL) is a layered composite of wood veneers and adhesive. Hence it can be considered as a veneer based product.A high performance more sustainable alternative to lumber, Laminated Veneer Lumber (LVL) beams, headers and columns are used in structural applications to carry heavy loads with minimum weight. Structural LVL products are manufactured in a controlled environment resulting in straighter, stronger and more uniform product compared to milled lumber, creating a more stable and reliable product than dimensional lumber because it doesn’t twist and warp or shrink over time.
LVL is a high-quality structural material with uniform engineering properties and dimensional flexibility which makes it superior to sawn timber and glued laminated timber, particularly for large-span structures. LVL is an engineered, highly predictable, uniform lumber product, because natural defects such as knots, slope of grain and splits have been dispersed throughout the material or have been removed altogether within the veneer assembly.
LVL is made up of parallel laminations of veneer, glued and processed together to form material of thickness similar to sawn timber. The distinguishing difference between LVL and plywood is the orientation of the veneer layers
1.When inspect the LVL ,first ,check if all the veneer wood grain direction are the same or not
2.Thickness tolerance ,width and length tolerance
4.Wood species of the core veneer
5.Edges defects such as overlaps and core voids
6.Plies of the LVL
|Bending Stress||Modules of Elasticity||Compression (perpendicular)||Horizontal Shear|
8.• LVL should be protected from the weather and stored lying flat.
• Product must not be stored in contact with the ground.
• Store LVL in wrapped bundles, provide air circulation and support bundles with 2×4 stickers.
• Protect from the weather on the job site both before and after installation. LVL is intended for use in
covered, dry conditions only.
• Except as described in this product guide, LVL should not be cut, drilled or notched.
• Do not install wet or visually damaged product.
• Once a factory sealed LVL product is cut, a coat of water repellent sealer should be applied to the freshly
cut end to prevent moisture from entering the cut end
Splitting, Fissures in the final product
Hence the veneers of LVL are dried to the desired moisture content, LVL does not shrink any further after hot pressing. As a result of this splits or fissures do not occur, whereas sawn timber and glued laminated timber are still subject to shrinkage due to non efficient drying.
The natural aesthetic beauty of sawn timber includes the appearance of knots, wane, resin pockets, splits, slope of grain, and a few other less significant defects. Some of these defects have a great influence in the optical quality of the sawn timber and can diminish the value of the sawn timber in large extend.
LVL offers a more uniform surface with nearly the same beauty of natural wood. Scarf-joints visible on the surface might be a problem that reduces the quality of the optical appearance if dark coloured resins such as PF-resins are used.
The manufacture of LVL requires an in-house quality assurance organisation. Regular independent third party quality audits by a certification organisation are a required part of the manufacturers’ quality assurance program.
LVL products are tested and approved for use by the major code and product evaluation agencies . All manufactured LVL products which have been tested and approved in this way should bear the seal of the certification agency, the manufacturer, date of manufacture, grade of LVL and reference to any applicable code or evaluation agency approval numbers.
LVL is a proprietary product having engineering properties that are dependent on the materials used in the manufacture and on the product assembly and manufacturing processes. As such, it does not meet a common standard of production. Therefore, designers and installers should follow the design, use and installation guidelines of the individual manufacturers.
LVL Product Size options:
Thickness – 1-1/8″, 1-3/8″, 1-1/2″, 1-3/4″, 2-1/2″, 3-1/2″, 5-1/4″ and 7″
Widths – 3-1/2 ” to 24″. Specialty rip width on request
Lengths – 8′ to 72′. lengths available on request