LVL User’s Guide Technical Data for LVL Headers, Beams, Column Applications for Residential Floor and Roof Systems

LVL User’s Guide Technical Data for LVL Headers, Beams, Column Applications for Residential Floor and Roof Systems

When sizing beams and headers,   need to have :

1.sufficient
moment capacity (Fb),

2.sufficient shear capacity (Fv),

3.sufficient stiffness (EI)

to satisfy the live and total load deflection criteria
and you need to have

4.adequate bearing sizes (Fc i )

The industry markets LVL beams and headers based on the MOE value (modulus of elasticity = E) which along with the
size of the beam (moment of inertia = I) determines the stiffness (EI) of the beam. The stiffness of a beam determines how much deflection a beam will experience under a given load. Deflection is a performance criteria established by building codes (L/360). Stiffness is not the same as strength!Not all applications are controlled by stiffness, many are
controlled by strength (Fb and Fv). In some applications, a 1.9E or 2.0E beam cannot be used as a substitute for a 1.8E beam that has superior strength properties (Fb and Fv),A beam 16’ long, carrying 300 PLF, with 1.9E material will
deflect 0.0344 inches less (¹⁄₃₂”) under total load compared to the same beam with 1.8E
material. This is not much, especially when you consider the premium you pay for high MOE products.

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