Wood web stiffeners are installed tight to the top flange on both sides of the TJI joist web, maintaining a one-eighth to two-and-three-quarter-inch gap at the bottom flange. Nailing requirements vary by joist series and depth, utilizing either eight-penny or sixteen-penny nails spaced across end and intermediate locations. Web stiffeners are sized per the scheduled series, ranging from five-eighths by two-and-five-sixteenths inches up to two-by-four solid lumber. Notes specify that web stiffeners are required for twenty-two-inch and twenty-four-inch TJI 560D joists, with material grades specified as PSI or PS2 sheathing or construction grade or better.
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