Engineered Wood
Engineered Wood Products: LVL, Glulam, I-Joists, and More (2026)
Engineered wood products have revolutionized construction by offering more consistent strength, longer spans, and less waste than solid sawn lumber. From LVL beams that replace steel to I-joists that outperform traditional floor framing, these products solve problems that solid lumber alone cannot. This guide explains each product type and when to use it.
Key Takeaways
- Engineered wood products have revolutionized construction by offering more consistent strength, longer spans, and less waste than solid sawn lumber.
- From LVL beams that replace steel to I-joists that outperform traditional floor framing, these products solve problems that solid lumber alone cannot.
- This guide explains each product type and when to use it.
- Product type — LVL, PSL, LSL, glulam, and I-joists each serve different structural roles.
- Span and load ratings — engineered products have published span tables that must be followed precisely.
What to Look For
- Product type — LVL, PSL, LSL, glulam, and I-joists each serve different structural roles.
- Span and load ratings — engineered products have published span tables that must be followed precisely.
- Moisture sensitivity — most engineered wood products are more moisture-sensitive than solid lumber.
- Fire rating — some engineered products have specific fire rating requirements.
- Connection details — engineered products require manufacturer-specified connectors and fastening patterns.
- Site protection — these products must be kept dry during storage and construction.
Species Comparison
LVL (Laminated Veneer Lumber): Thin veneers glued in parallel. Exceptional beam and header material. Consistent strength, no knots or defects.
Glulam (Glue-Laminated Timber): Dimensional lumber layers bonded together. Available in architectural grades for exposed applications.
PSL (Parallel Strand Lumber): Long strands of wood bonded under pressure. Excellent for columns and beams. Distinctive strand pattern.
I-Joists: Engineered flange-and-web design. Superior floor and roof framing with less material than solid joists.
OSB (Oriented Strand Board): Strand-based panels for sheathing and subflooring. Cost-effective alternative to plywood.
Size Guide
LVL beams: 1-3/4" thick (single ply), depths from 7-1/4" to 24". Multiple plies for wider beams.
Glulam beams: Standard widths 3-1/8", 5-1/8", 6-3/4". Depths from 6" to 30"+. Custom sizes available.
PSL columns: 3-1/2" x 3-1/2" to 7" x 7". Lengths to 60'.
I-Joists: Depths from 9-1/2" to 16" (residential). Flanges 1-1/2" to 3-1/2" wide. Lengths to 60'.
OSB panels: 4x8 standard. 7/16" (wall sheathing), 23/32" (subfloor), 3/4" (rim board).
Grade Guide
LVL: Rated by manufacturer's published E-value (modulus of elasticity) and allowable bending stress. Typical: 1.9E, 2800Fb.
Glulam: Rated by combination symbol (e.g., 24F-V4). Higher number = higher bending strength. Appearance grades: industrial, architectural, premium.
I-Joists: Rated by depth, series, and manufacturer's span tables. No universal grading — follow manufacturer specifications.
OSB: Rated by span rating stamp (e.g., 24/16 means 24" rafter spacing, 16" floor joist spacing) and exposure rating.
Budget Breakdown
LVL beam (1-3/4" x 11-7/8" per lin ft): $4–$7.
Glulam beam (5-1/8" x 12" per lin ft): $12–$20.
PSL column (3-1/2" x 3-1/2" per lin ft): $5–$8.
I-Joists (11-7/8" per lin ft): $3–$5.
OSB (7/16" 4x8 sheet): $15–$30.
OSB (23/32" T&G subfloor): $30–$50.
Engineered wood typically costs more per piece but saves on labor and allows smaller framing dimensions.
Common Mistakes to Avoid
- Field-cutting I-joist flanges or web holes without following manufacturer guidelines — unauthorized modifications void structural ratings.
- Storing engineered products uncovered on-site — moisture damage compromises adhesive bonds and structural integrity.
- Using generic span tables instead of the specific manufacturer's tables — ratings vary between manufacturers.
- Substituting one engineered product for another without engineering review — LVL, PSL, and glulam are not interchangeable.
- Notching or drilling LVL beams — this is almost never permitted and can cause catastrophic failure.
Pre-Purchase Checklist
- Obtain engineer's specification for product type, size, and manufacturer
- Verify product availability and lead times (some sizes require special ordering)
- Confirm you have the manufacturer's installation guide on-site
- Plan covered storage to keep products dry
- Order manufacturer-specified connectors and fasteners
- Schedule delivery close to installation to minimize site exposure
- Verify fire-rating requirements if applicable
Frequently Asked Questions
Engineered wood excels for long spans (over 16'), heavy loads, and consistent performance. Use it for floor systems, ridge beams, headers, and anywhere dimensional lumber doesn't meet span requirements.
LVL and glulam beams can replace steel in many residential applications while being lighter and easier to work with. For very heavy loads, steel may still be required.
Yes, but only according to manufacturer guidelines. I-joists have specific rules about hole size and location. LVL should never be notched. Always follow the product manual.
Generally yes. Engineered products use smaller, faster-growing trees more efficiently than large solid sawn timbers, and manufacturing waste is minimal.