Microlam Beam Size Calculator
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What Is a Microlam Beam?
A Microlam beam is a type of LVL (laminated veneer lumber). It is engineered by bonding thin wood veneers with adhesives under heat and pressure. The result is a high-strength, uniform, and reliable beam that outperforms traditional solid-sawn lumber.
Key advantages of Microlam beams include:
- High strength-to-size ratio
- Available in long lengths without warping
- Consistent performance compared to solid lumber
- Ideal for carrying heavy loads across wide spans
Because of these properties, Microlam beams are often used for:
- Floor beams
- Roof beams
- Headers over doors and windows
- Support in remodels and new builds
What Is a Microlam Beam Size Calculator?
The Microlam Beam Size Calculator is an online tool that helps you determine the minimum recommended size of a Microlam LVL beam for your project.
It uses three main inputs:
- Span (feet): The clear distance the beam must cover.
- Total Load (lbs): The weight the beam needs to support, including dead load (materials) and live load (people, furniture, snow, etc.).
- Microlam Grade: Different grades such as 1.8E, 2.0E, or 2.2E indicate stiffness and strength.
With this information, the calculator estimates:
- Required Moment of Inertia (I) → relates to deflection control.
- Required Section Modulus (S) → relates to bending strength.
- Recommended Beam Size → chosen from common Microlam sizes that meet or exceed requirements.
How the Calculator Works (Plain-English Version)
The calculator uses standard beam formulas to check whether a beam can handle the given span and load.
- Span is converted to inches.
- Required I (moment of inertia) is calculated to control deflection.
- Required S (section modulus) is calculated to control bending stress.
- The tool compares your results with a list of common Microlam sizes.
- It suggests the smallest size that meets both strength and stiffness needs.
For example:
- Span = 10 ft
- Load = 5,000 lbs
- Grade = 2.0E LVL
The calculator might recommend a 1.75″ × 9.5″ Microlam if it satisfies both deflection and bending limits.
Why Use This Calculator?
- Saves time: No need to dive into complex beam tables.
- Increases accuracy: Uses engineering formulas tailored to Microlam grades.
- Improves planning: Helps with budgeting and material orders.
- Supports DIYers and pros alike: Useful for homeowners, contractors, and architects.
Important Notes
While the Microlam Beam Size Calculator is a great starting point, it is not a substitute for professional engineering judgment. Real-world factors like:
- Multiple spans
- Point loads vs. uniform loads
- Bearing conditions
- Building codes
- Local safety requirements
…can affect the final beam size you should use.
Always confirm with a structural engineer or building inspector before finalizing your design.
