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· Registered User
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Only to stiffen it making it act as one, maybe for a heavy light fixture.

To prevent fires from spreading, especially at a drop or closed soffit. Or at a curved ceiling for fire stop- installed at the beginning of the flat ceiling part.

Over any and all walls below, for fire stop, as in a basement finishing. Could possibly use draft stopping- check with local codes at B.D.

Blocking at ceiling/wall areas for fire.

Required if ceiling >1000 sq.ft.& ceiling hung from bottom of joists.

Pick one, or what is the application? Be safe, G
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