A.Phil Westover responds: LVL can be used to strengthen or stiffen existing beams, but the manufacturer’s load tables will generally not apply, and engineering analysis will likely be required to assess the member and connection capacities. The final design will depend on the geometry of the structural assembly, the design properties for the LVL, and the design properties of the existing framing.

In the case of a typical "top-loaded, "simple-span" beam (see Figure 1), the manufacturer’s tables and installation guidelines may be used to size the LVL if the following conditions are met: The supported members will bear on the top of the LVL, positive and adequate-bearing supports are provided to support the beam-end reactions...

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