LVL Design Tables

What Are LVL Design Tables?

LVL design tables are manufacturer- or code-published references that summarize the structural performance of LVL members. They are based on standardized testing, material properties, and design assumptions aligned with building codes.

Typical tables present allowable spans or capacities based on:

• Member size (depth and width)
• Loading conditions
• Spacing or tributary width
• Deflection criteria
• Support conditions

Rather than performing full calculations, designers use these tables to select an appropriate LVL size that meets strength and serviceability requirements.

Information Commonly Found in LVL Design Tables

1. Section Sizes

Tables list standard LVL widths (commonly 1¾", 3½", or built-up multiples) and depths ranging from shallow headers to deep floor and roof beams.

2. Allowable Spans

Span tables show the maximum clear span an LVL can support under specified loads. These spans are often governed by:

• Bending strength
• Shear capacity
• Deflection limits (such as L/240 or L/360)

3. Load Assumptions

Design tables typically assume:

• Uniformly distributed loads
• Specific dead and live load values
• Simple-span or continuous-span conditions

Always verify that your project’s loading matches the assumptions used in the table.

4. Deflection Criteria

Many tables are controlled by deflection rather than strength. Serviceability limits help prevent issues such as sagging floors, cracked finishes, or bouncy framing.

5. Adjustment Factors

Some tables include or reference adjustment factors for:

• Load duration
• Moisture conditions
• Temperature
• Repetitive member use

These factors can significantly affect allowable capacities.

How to Use LVL Design Tables Effectively

1. Define the application
   Determine whether the LVL is acting as a beam, header, joist, or rafter.
2. Determine loads and tributary width
   Identify dead loads, live loads, snow loads, and the area supported by the member.
3. Select the correct table
   Use tables that match the support conditions, spacing, and loading type.
4. Check both strength and deflection
   The governing condition is often deflection, especially for longer spans.
5. Confirm bearing and connection requirements
   Tables may not account for bearing length, fastener capacity, or hanger limits.

Limitations of LVL Design Tables

While design tables are convenient, they have limitations:

• They are based on simplified assumptions
• They may not cover unusual geometries or point loads
• They are specific to certain LVL grades or manufacturers

For complex conditions, engineered calculations or software analysis may be required. CivilWeb includes design spreadsheets for LVL beam and columns.

Manufacturer-Specific Tables Matter

LVL properties vary by manufacturer due to differences in veneer quality, adhesive systems, and manufacturing processes. Design tables are not interchangeable between products unless explicitly stated.

Always use:

• The correct table for the specific LVL product
• The most current version approved for use under the applicable building code

When to Go Beyond the Tables

LVL design tables are best suited for common residential and light commercial applications. You should perform full calculations when:

• Loads are non-uniform or concentrated
• Spans exceed tabulated limits
• Members are curved, notched, or tapered
• You are designing for critical or highly optimized structures

Final Thoughts

LVL design tables are powerful, time-saving tools that bridge the gap between theory and practical construction. When used correctly—and within their stated assumptions—they enable efficient, safe, and code-compliant structural design. Understanding what’s behind the tables is just as important as knowing how to read them, ensuring confidence in every LVL selection.