LVL Beams: Sizes, Spans, Cost, and Comparison with Steel

LVL beams have changed how builders frame large openings, long roofs, and heavy floor loads. LVL stands for laminated veneer lumber, an engineered wood product built from thin sheets of wood veneer glued together under heat and pressure. Where solid timber varies in strength and steel carries a weight penalty, LVL delivers predictable, uniform performance in long, straight members. Designers often set the material against rolled steel, and the way H-beam and I-beam sections compare by weight, web depth, span, and flange geometry explains much of the difference. This article covers what LVL is, how it is made, standard sizes and spans, advantages and limits, cost guidance, and how it stacks up against steel framing.

What Is an LVL Beam?

An LVL beam is a structural member built from thin veneers of fast-growing softwood such as pine, spruce, or fir. The veneers are bonded with the grain running parallel to the beam length, pressed under high pressure and heat into a solid billet, and sawn to finished width and depth. Because defects are spread across dozens of thin layers rather than concentrated in one piece, the beam behaves more predictably than solid lumber.

The key differences, uses, and structural selection of timber, LVL, and steel come down to load path, cost, and connection details. Timber is cheap and easy to cut but limited in span. Steel spans farthest but needs fabrication and fire protection. LVL sits between them: long spans, simple cutting, and consistent engineering properties.

How LVL Is Manufactured

Manufacturing starts with rotary peeling, where a lathe spins a debarked log against a blade to produce a continuous veneer ribbon about 2.5 to 3 millimeters thick. The ribbon is clipped into sheets, dried to about 10 percent moisture, and graded for knots, splits, and density. The standard sequence runs as follows:

1. Veneers are graded and defects such as loose knots are cut out.
2. Adhesive is applied to both faces; phenolic and melamine-urea resins are common.
3. Sheets are stacked with the grain parallel to the intended beam length and joints staggered so no two weak points line up.
4. The stack enters a hot press at 120 to 160 degrees Celsius, squeezing the layers into a dense billet.
5. The cured billet is trimmed, sawn to ordered widths and depths, and end-trimmed to exact length.

Veneer Grading and Bonding

Grading matters because a single poor sheet can weaken the whole beam. Mills sort veneer by strength class, discard pieces with large knots or splits, and stagger the end joints between layers.

LVL vs Plywood

Both products start from veneer, but the layups differ. Plywood alternates the grain direction from layer to layer, which spreads strength in two directions and suits panels and sheathing. LVL keeps every layer parallel, concentrating strength in one direction so the member behaves like a beam. That is why plywood is ordered in panel thicknesses while LVL is ordered as a beam section with a width and depth.

LVL Beam Sizes and Spans

LVL is stocked in a limited set of standard sections, and engineers pick from that catalog. Common widths are 1-3/4, 3-1/2, 5-1/4, and 7 inches, matching one to four plies of the base laminate. Depths run from 7-1/4 inches up to 18 inches, with 9-1/4, 11-7/8, and 14 inches among the most requested. Lengths are cut to order and regularly reach 40 to 60 feet. In steel, a review of H-beam vs I-beam proportions shows the same sizing logic applied to rolled sections: deeper members span farther at similar weight, and flange width controls lateral stability.

Common LVL Sections

The sections most often stocked for residential and light commercial framing appear below.

How Far Can an LVL Beam Span?

Span depends on four variables: the load per square foot, the spacing between beams, the beam depth, and the deflection limit set by the building code. As a rough rule for typical floor loads, a beam spanning in feet needs about the same number in depth inches: an 11-7/8 inch deep beam carries about 12 feet, and a 16 inch deep beam about 16 feet, at 16 inch spacing. Spacing at 12 inches extends the allowable span roughly 10 to 15 percent; 24 inch spacing shortens it. A double 2×10 LVL, two 1-3/4 by 9-1/4 inch members bolted side by side, spans about 14 to 18 feet for standard residential loads depending on spacing and grade. Manufacturer tables and an engineer set the final number, because the same section carries far more under a light roof load than a heavy floor.

Advantages of LVL Beams

LVL competes with structural steel sections in many frames, and the choice changes cost, fire rating, and connection work. For most residential and light commercial projects timber wins on simplicity; steel earns the job where spans are very long or loads are heavy.

• Strength-to-weight ratio: bending stress ratings reach 2,600 to 3,100 psi, close to high-grade sawn timber but consistent in every piece.
• Dimensional stability: controlled drying keeps shrinkage, warping, and twisting to a minimum.
• Uniform quality: knots and slope-of-grain defects are redistributed across veneers, so two beams of the same grade perform alike.
• Long lengths: members up to 60 feet reduce splices and let architects open up walls without intermediate posts.
• Efficient timber use: fast-growing species and high log yield cut waste, and production consumes less energy than steelmaking.

Strength and Consistency

Because the veneers are graded before bonding, an LVL beam does not hide a knot where a designer does not expect one. The modulus of elasticity, which controls deflection, is published for each product and grade, so engineers calculate deflection with confidence.

Design Flexibility

Manufacturers cut LVL to custom lengths, so a beam arrives at exact size with no field splicing. Sections can be nailed or bolted together to build up wider members, and the material works with standard woodworking tools.

Moisture Behavior

Like all wood products, LVL moves with humidity. The factory moisture content is low, and the parallel layup limits cupping and twisting, but the beams still need protection from weather on site and a moisture barrier where they bear on concrete.

Disadvantages and Limitations of LVL Beams

LVL is not a universal fix; the limitations below decide when another material is the better call.

Cost and Availability

Per linear foot, LVL costs more than solid lumber, and the price climbs quickly with depth. Not every yard stocks 18 inch sections, so long members are ordered ahead, adding lead time.

Handling and Field Rules

A 3-1/2 by 16 inch beam can weigh over 100 pounds per 20-foot length, so crew lifting aids are often needed. Cutting rules are strict: notching the tension zone or drilling oversized holes can cut capacity dramatically, and each modification must follow the manufacturer’s allowance. The beam must stay dry; repeated wetting and drying softens the adhesive bond and causes edge swelling. Before the beam is fixed, crews check that the top edge sits straight and level, and the I-beam vs box beam levels used for that check differ in stiffness, accuracy, and price.

Fire and Exposure Limits

LVL burns, so enclosed assemblies rely on gypsum board for fire resistance. Exterior use demands cladding, because the veneers are not durable against prolonged wetting.

LVL Beam Cost and Sizing

Budgeting an LVL install means pricing the material per linear foot, the hangers and hardware, and the labor to set the member. Material runs 3 to 12 dollars per linear foot depending on section, and hardware adds 10 to 25 percent. The ranges below are typical for a 3-1/2 inch wide beam.

How to Calculate LVL Beam Size

The sizing process is repeatable and fits on one page of notes:

1. Add the dead and live loads for the floor or roof, typically 40 to 60 pounds per square foot for residential floors.
2. Multiply by the tributary width, the strip of floor the beam supports, to get pounds per linear foot.
3. Choose a beam spacing of 16 or 24 inches on center.
4. Enter the manufacturer’s span table with the total load and spacing to find the minimum depth.
5. Check deflection against the L/360 floor limit and confirm at least 1-1/2 inches of bearing at each end.
6. Select the width and depth combination that fits the wall or roof cavity.

Working with Span Tables

Every LVL producer publishes its own span tables, and the numbers differ between products, so the table from the actual supplier governs. For the most common brand-form of LVL, Microllam beam sizing, loads, and installation basics follow the same rules described here. Large openings or unusual loads warrant an engineer’s review before ordering.

LVL vs Steel Beams

Both materials make good beams, and the right answer depends on the job. The comparison below puts the main differences side by side.

When LVL Is the Better Choice

For houses, garages, and low-rise commercial buildings, LVL usually wins on cost, speed, and simplicity. Carpenters cut and set it without a crane or a steel erector, and it nails into the surrounding framing. Steel frames transfer load through the types of steel beam connections used at each joint, while LVL members rely on joist hangers, bolts, and bearing plates.

When Steel Is the Better Choice

Steel takes over where spans exceed timber sections, where headroom forces a shallow member, or where the code demands non-combustible construction. Steel also suits long transfer beams and industrial framing with heavy loads. The decision comes down to one question: can an LVL section meet the span and deflection limits at an acceptable cost? If it can, timber is faster; if not, steel earns the premium.