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Engineered Wood Products


Engineered Wood Products (EWP), includes a range of wood products which are manufactured by binding the strands, particles, fibers, or veneers of wood, together with adhesives, to form composite materials. These products are engineered to precise design specifications which are tested to meet national or international standards. Engineered wood products are used in a variety of applications, from home construction to commercial buildings to industrial products.

Plywood is sometimes called the original engineered wood product.

Oriented Strand Board (OSB) is a wood structural panel manufactured from rectangular-shaped strands of wood that are oriented lengthwise and then arranged in layers, laid up into mats, and bonded together with moisture-resistant, heat-cured adhesives. The individual layers are cross-oriented to provide strength and stiffness to the panel. Produced in huge, continuous mats, OSB is a solid panel product of consistent quality with no laps, gaps or voids.

Glued laminated timber (glulam) is composed of several layers of dimensional timber glued together with moisture-resistant adhesives, creating a large, strong, structural member that can be used as vertical columns or horizontal beams, as well as curved, arched shapes. Glulam is the only engineered wood product that can be produced in curved shapes, offering extensive design flexibility.

Laminated Veneer Lumber (LVL) is produced by bonding thin wood veneers together in a large billet. The grain of all veneers in the LVL billet is parallel to the long direction. The resulting product features enhanced mechanical properties and dimensional stability that offer a broader range in product width, depth and length than conventional lumber.

I-joists are “I”-shaped structural members designed for use in floor and roof construction. An I-joist consists of top and bottom flanges of various widths united with webs of various depths. I-joists are designed to carry heavy loads over long distances while using less lumber than a dimensional solid wood joist of a size necessary to do the same task. As of 2005, approximately half of all wood light framed floors were framed using I-joists.

Engineered wood products are used in a variety of ways, often in applications similar to solid wood products. Engineered wood products may be preferred over solid wood in some applications due to certain comparative advantages:

Because engineered wood is man-made, it can be designed to meet application-specific performance requirements.

  • EWP are versatile and available in a wide variety of thicknesses, sizes, grades, and exposure durability classifications.
  • EWP are designed and manufactured to maximize the natural strength and stiffness characteristics of wood. The products are very stable and some offer greater structural strength than typical wood building materials.
  • EWP are easy to work with using ordinary tools and basic skills. They can be cut, drilled, routed, jointed, glued, and fastened.
  • EWP provides the natural warmth and beauty of wood and many can be easily and beautifully finished with paints, stains, and varnishes.
  • Engineered wood products make more efficient use of wood. They can be made from small pieces of wood, wood that has defects or underutilized species.



As a global leader in engineered wood products, Louisiana Pacific (LP®) Building Products delivers innovative products for the building industry. LP® EWP products are backed by lifetime limited warranty for untreated products and 25-year limited warranty for treated products. All products are wood sourced through programs certified under the Sustainable Forestry Initiative®.

LP® SolidStart® I-Joists

    • I-Joists weigh less than conventional framing lumber and can be trimmed on-site, saving installation time.
    • Manufactured in long lengths allow ceilings and floors to be designed with fewer pieces to be cost-effective.
    • LP® SolidStart® I-Joists will not split, twist, warp or shrink. Their dependable structural values, combined with straightness and uniformity, provide stiffer, more uniform floors with fewer squeaks.

LP® SolidStart® Rim Board

    • Designed with low shrinkage and high strength, LP SolidStart Rim Boards are cut to match depths of LP® SolidStart® I-Joists, which eliminates the need for field ripping and creates flat surfaces for easy installation of siding.
    • Approved for one-hour and two-hour fire-rated rim board assemblies for party and exterior walls gives peace of mind.
    • Manufactured with high lateral load capacity for seismic and high wind applications, and high vertical load capacity and low shrinkage for mid-rise construction, creates strength and durability.

LP® SolidStart® Laminated Veneer Lumber (LVL)

    • Made in accurate and consistent sizes, LP® SolidStart® LVL’s resists warping, twisting and shrinking.
    • Can be used in place of traditional lumber for greater consistency and design and flexibility.

LP® SolidStart® Laminated Strand Lumber (LSL)

    • LP® SolidStart® LSL are available in 1.75E grade, the industry’s highest grade of LSL, and manufactured by the leader in strand board technology that allows for longer spans and greater design flexibility.
    • Can be used for floor beams, door and window headers, garage door headers, roof and wall framing, rim board, stair stringers and sill plates.
    • Designed with consistent low moisture content helps LP® SolidStart® LSL’s resist twisting, warping and shrinking.

LP® SolidGuard® Laminated Strand Lumber (LSL)

    • LP® SolidGuard® LSL are manufactured to provide a full wall plate solution for taller wood-framed buildings and long lengths make it easy for continuous framing along walls.
    • Manufactured straight and stays straight, treated throughout with no need to field treat, and is free of knots and other naturally occurring defects.
    • Treated with zinc borate to resist termite damage and fungal decay.



Rosboro, the national leader in glulam production, focuses their strengths as innovators in laminated technology. Operating facilities in the Pacific Northwest, the company manufactures products ranging from studs and dimension lumber to a complete line of glulam.

Hi-Clear II Treated Rosboro X-Beam

    • Manufactured with a clear wood preservative that leaves the beam an attractive honey-color, Hi-Clear II protects against decay, mold, bacteria and insects.
    • Most cost effective EWP – 20-30% less expensive than LVL and up to 20% less expensive than LSL
    • Backed with a 25-year warranty, Rosboro Treated X-Beam products are an excellent choice for decks, porches and balconies where appearance is critical.



Known as one of the oldest glulam manufacturers in the U.S., Calvert Company, Inc. brings more than 50 years of experience producing high quality glued laminated beams. Calvert Company has two manufacturing plants in the Pacific Northwest – Washougal and Vancouver, Washington – which produce glulams for both commercial and residential projects around the world.

GL3000 IJC Glulam

    • A high-stress beam, ideal for engineered floor systems. With LVL lamination at the top and bottom of the GL3000, strength and dimensional stability increases as compared to solid sawn lumber.
    • Allowable bending stress of 3000 psi, which is 24% higher than conventional glulam and a modulus of elasticity of 2,100,000 psi or about 17% higher than traditional glulam.
    • Manufactured with zero camber for easier use in floor framing applications.


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