RE: fire rated drywall?

["Randall" <tr3driver@comcast.net>]

> I figured I should use fire rated sheetrock.  What thicknesses does it
> come in?  I seem to recall back when I did rough carpentry as a student
> that we used 3/8" or maybe 1/2" sheetrock on ceilings, with 5/8" on walls?

I haven't seen fire-rated any thinner than 1/2", and I think it's available
in various thicknesses all the way up to 1".  But 5/8" seems to be most
common.

Randall