We never recommend notching joist flanges, but small notches may be permissible in some situations based on joist span and loading.
Technical Bulletin TB-818 provides technical information for analyzing and repairing TJI joists with side top flange notches when necessary. If an existing notch does not meet the criteria of this Technical Bulletin, please contact Weyerhaeuser Tech Support.
Watch video here for more info - Flange Cut Repair
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