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Materials & Specificationsaka: EWPaka: engineered lumberaka: manufactured wood

Engineered Wood

In Plain English

Factory-made wood products like I-joists and LVL beams that are stronger and more consistent than regular solid wood.

Definition

Engineered wood products are manufactured lumber products made by binding wood strands, fibers, veneers, or particles with adhesives to create structural members with superior and more predictable properties than solid sawn lumber. Examples include LVL, LSL, I-joists, and glulam beams. Engineered wood uses wood fiber more efficiently and can be produced in sizes and lengths not available in solid sawn lumber.

Why It Matters in Bidding

Engineered wood products are spec-sensitive substitutions, so estimators must bid exactly the LVL, LSL, I-joist, or glulam called out because swapping grades or depths can void the structural design. Pricing and lead times differ sharply from dimensional lumber, and proprietary products from specific manufacturers can create single-source procurement risk that affects both cost and schedule.

Example

Building a framing takeoff, an estimator lists the specified LVL header sizes and I-joist series from the engineer's plans, gets a quote from the engineered-wood supplier, and notes the longer lead time on the deep glulam ridge beam.

Related Terms

Laminated Veneer LumberOriented Strand BoardDimensional LumberSoftwood

Frequently Asked Questions

Engineered members are sized by the structural engineer for specific load and span values tied to a product's published properties. Substituting a different brand, grade, or depth can change capacity and void the design. Any substitution generally requires engineer approval and may need a re-stamped detail, so estimators bid exactly what the plans specify.
Engineered products usually cost more per piece than sawn lumber but span farther, carry heavier loads, and reduce field labor from straightening or culling. Estimators weigh higher material cost against fewer pieces, faster installation, and reliable performance. Some proprietary items also carry longer lead times that affect procurement and schedule.
Deep glulam beams, long-span I-joists, and specialty LVL sizes may be made to order, extending delivery beyond standard lumber availability. Single-source proprietary products add procurement risk if a supplier is backlogged. Estimators flag these long-lead items so orders release early and the schedule reflects realistic material delivery.

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