Regular vs. Type X Drywall

Depending on where it was made may give you a clue. Fire rated is made with mixing a non combustible fiber with the gypsum. Unless you can easily see the gypsum (hole cut for receptacle) and actually see the fibers it's very hard to tell what type it is. Even this may not help. If it is new and still stacked and held together with the tape, it should state the rating or have a brand name on it.

Thanks,...sorry to hear that.

If your looking at new sheets it should be printed/stamped on each sheet somewhere. If its already installed/papered over/plastered/painted, it might be a bit harder.

Most drywall is inherently fire retardent due mostly to the fact that gypsum turns to water (or rather expells the water in it) when heated to suficient temperature. That is why if you need more fire protection you should put up thicker drywall.

It all depends on the manufacture, thickness, age, and condition of the drywall. if it is 1/2" type X it will be stamped on the factory ends of the sheet. the best "ruel of thumb" is if it is 5/8" drywall it is type x. but with 1/2" you will have to look at the back side of the sheet if you can't see the factory "bevels" on the sheet.