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Wood lintels and ridge beams

Wood lintels and ridge beams

Wood lintels and ridge beams

(OP)
The 2004 Span Book for wood says that "For lintels and ridge beams, shear strength is increased by one third to account for the unlikely event of finding the maximum size of splits in all plies of a multiple ply member".

Questions:

1. Is this in addition to the the 10% system factor for shear in
Table 1 for lintels and ridge beams (Roof loads only)?

2. Why is this one third increase in shear allowed only for 2 ply lintels and not for 3 ply beams? Can a perimeter ground floor 3 ply built up beam spanning between foundation piers of a cottage and supporting 2 floors and a roof, be allowed this one third increase in shear?

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