Question 1

What is LVL and how does it differ from solid wood lumber?

Accepted Answer

LVL (Laminated Veneer Lumber) is made from thin wood veneers laminated together with adhesive. It's stronger and more consistent than solid lumber because defects are distributed throughout the product. LVL typically has higher load capacity and better dimensional stability, making it ideal for long spans and heavy loads.

Question 2

Can LVL beams be cut or notched?

Accepted Answer

Yes, but with restrictions. Cutting reduces beam strength. Never cut more than 1.5 inches deep at the top or 1 inch at the bottom. Notches weaken the beam and should be avoided when possible. Always consult the manufacturer's specifications and building codes before making any modifications. Check with a structural engineer for large cuts.

Question 3

What is the minimum bearing length for an LVL beam?

Accepted Answer

Typically 3.5 inches minimum bearing length is required at supports. This ensures proper load distribution and prevents crushing. For heavier loads, greater bearing length may be required. Always verify local building codes and manufacturer specifications for your specific application.

Question 4

What fasteners are recommended for LVL beams?

Accepted Answer

Use corrosion-resistant fasteners like hot-dipped galvanized or stainless steel nails and bolts. Space fasteners according to code requirements. When nailing plies together, use 16d nails spaced 12 inches apart along the width. Avoid undersized or improper fasteners that can reduce structural integrity.

Question 5

How do load duration factors affect LVL beam rating?

Accepted Answer

Load duration factors adjust the design values based on how long the load is applied. Permanent loads use 90% of design value, while short-term loads (one day) can use up to 133%. This accounts for wood's time-dependent strength properties. Always select the appropriate factor for your application to ensure safety.

Question 6

What's the difference between single and multi-ply LVL beams?

Accepted Answer

Single-ply beams use one piece of LVL. Multi-ply beams stack multiple pieces to increase thickness and bearing area. Two-ply beams (3.5 inches) are most common and offer better span and load capacity than single ply. Three and four-ply beams are used for heavy loads or long spans where single/double ply won't work.

Question 7

How do I select the right LVL manufacturer?

Accepted Answer

Major manufacturers include Boise Cascade, Louisiana-Pacific (LP), Weyerhaeuser, and others. Each has slightly different properties and pricing. Consult your local supplier for availability and costs. Compare design values (E and Fb ratings) to ensure you select a product that meets your structural requirements.

Question 8

Why is deflection important in beam selection?

Accepted Answer

Excessive deflection can cause cracking in drywall, misaligned doors/windows, and visible sagging. Building codes limit deflection to L/360 for floors and L/240 for roofs. While a beam might be strong enough not to fail, it must also stay stiff enough to prevent these cosmetic and functional issues. This calculator checks both moment and deflection requirements.

LVL Beam Calculator

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Advantages of LVL Beams

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