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RE: DQoD: "Lateral Torsional Support from Gypsum Board"

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>Is it common to lend lateral torsional support

>via the use of gypsum board, such as ceiling

>drywall applied directly to the underside of the

>rafters?

 

Drywall does provide some restraint, though it is a brittle type of restraint. That is, the support is there as long as the fasteners are not loaded enough to fail the surrounding gypsum board in bearing.

 

There is probably a healthy stability contribution from the sheathing attached to what becomes the tension flange during the wind suction loading. This provides resistance to lateral-torsional buckling by torsional restraint of the cross section. How much will depend upon the diaphragm stiffness, connection of the sheathing to the beam, beam web stiffness, etc.

 

Charlie