Engineered lumber plays a critical role in modern floor systems, delivering consistent strength, long spans, and dependable performance where traditional dimensional lumber can fall short. Manufactured from hardwoods and softwoods using advanced engineering processes, these products are designed to meet precise structural requirements — making them ideal for floor beams, I-joists, and other load-bearing framing components that support today’s open layouts and demanding builds.

LVL is produced by bonding thin wood veneers together in a large billet so that the grain of all veneers is parallel to the long direction. The LVL billet is then sawn to desired dimensions depending on the end-use application. Because LVL is made with scarfed or lapped jointed veneers, LVL is available in lengths far beyond conventional lumber lengths.

PSL is manufactured from veneers clipped into long strands laid in parallel formation and bonded together with an adhesive to form the finished structural section. The length-to-thickness ratio of the strands in PSL is around 300. Like LVL and glulam, this product is used for beam and header applications where high bending strength is needed. PSL is also frequently used as load-bearing columns.

Similar to PSL, laminated strand lumber is made from flaked wood strands that have a length-to-thickness ratio of approximately 150. Combined with an adhesive, the strands are oriented and formed into a large mat or billet and pressed. LSL is used in a variety of applications from studs to millwork components.

Similar to LSL, oriented strand lumber is also made from flaked wood strands. The strand geometry for OSL results in length-to-thickness ratios of approximately 75. Combined with an adhesive, the strands are oriented and formed into a large mat or billet and pressed. OSL is used in a variety of applications from studs to millwork components.

Manufactured from thin sheets of cross-laminated veneer and bonded under heat and pressure with strong adhesives, plywood panels have superior dimensional stability and an excellent strength-to-weight ratio and are highly resistant to impacts, chemicals, and changes in environmental temperature and humidity.

Oriented Strand Board is a widely used, versatile structural wood panel. Manufactured from waterproof heat-cured adhesives and rectangularly shaped wood strands that are arranged in cross-oriented layers, OSB is an engineered wood panel that shares many of the strength and performance characteristics of plywood.

Cross-laminated timber (CLT) is a wood panel product made from gluing together at least three layers^[2] of solid-sawn lumber, i.e., lumber cut from a single log. Each layer of boards is usually oriented perpendicular to adjacent layers and glued on the wide faces of each board, usually in a symmetric way so that the outer layers have the same orientation. An odd number of layers is most common, but there are configurations with even numbers as well (which are then arranged to give a symmetric configuration).

Medium-density fiberboard (MDF) is an engineered wood product made by breaking down hardwood or softwood residuals into wood fibers, often in a defibrator, combining it with wax and a resin binder, and forming it into panels by applying high temperature and pressure. MDF is generally denser than plywood. It is made up of separated fibers but can be used as a building material similar in application to plywood. It is stronger and denser than particle board.

Architected for performance and precision, our roof and floor trusses deliver engineered strength, reduced framing time, and design flexibility for your next build. Available in a range of configurations to match project needs.

Engineered trusses are an essential part of modern structural framing — delivering strength, precision, and speed for residential, commercial, and light-commercial projects. Designed and manufactured to exact specifications, our truss systems provide reliable support for roofs and floors while helping reduce jobsite labor and waste.

PREFABRICATED STRENGTH

Built in controlled settings with engineered design and high-quality materials, our roof and floor trusses offer consistent performance without the warping or variability that can come with stick framing.

FASTER FRAMING, LOWER LABOR COSTS

Trusses arrive ready to install, significantly reducing on-site framing time compared to traditional methods — helping projects stay on schedule and budgets tight.

CUSTOM SOLUTIONS – MADE TO ORDER

Whether you’re building simple gable roofs, complex rooflines, open floor systems, or vaulted ceiling designs, we offer engineered truss layouts tailored to your project’s needs.

GREATER DESIGN FLEXIBILITY

Long spans and open floor plans become simpler with engineered trusses, letting you optimize interior space without unnecessary load-bearing walls.

Partnering with EWP and trusted manufacturers, Spahn & Rose delivers engineered truss solutions that perform on site and help build better, faster, every time.

ENGINEERED BUILDING DESIGN

Engineered Building Design provides innovative, structurally sound and dimensionally accurate component systems, manufactured from high quality raw materials using exceptional workmanship and supported with prompt customer service. We offer the best installed value for the price!

 

LUMBER SPECIALTIES

A leading distributor of structural building components, Lumber Specialties offers a variety of products including roof trusses, floor systems and wall panels from an array of high-quality building-materials vendors.

WEYERHAEUSER

We’ve been developing new building products and solutions for more than 100 years. We’re your source for value-added solutions that improve performance, safety and profitability. From builders to homeowners, we offer exceptional product performance and unparalleled support including lumber, engineered lumber, OSB & panels and more.