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Unread 11-24-2020, 11:52 PM   #6
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Join Date: Aug 2020
Posts: 68
Sistering properly, doubles the strength of the tgi. Been there, done that.

The web absolutely contributes to the overall stiffness/ strength of the joist, otherwise hole size wouldn't be limited. It helps resist movement, and distributes forces in addition to aligning the cords.

Sistering can be performed several ways. Adding plywood or other sheathing material is called for by manufacturers specifically in cantilevered applications. Doubling of I joists, joined by solid filler in the web with glue and screws is another option. Doubling solid lumber to sandwich the web and glue and screw/ through bolting, is yet another option.

Each assembly has its own rating which also considers span. Either the manufacturer, or an engineer, would have easy access to these rated assemblies charts.

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