Hard hat zone!
Wow Jim, sorry to hear the ceiling attacked you! Maybe you should invest in a hard hat if any of the other ceilings are bad. As for the plaster over rocklath, the house I'm renovating - built in 1952 - had it (and still does in one room and some closets). It was in very good condition with only a few hairline cracks and no loosening anywhere, even in areas that had got wet. In fact, when I tore it out, most of the plaster stayed adhered to the panels, which are 16"X48". Talk about something heavy! I'm surprised it didn't knock you out. I estimated each piece to weigh at least 40 lbs. Did the whole panels come down off the joists above, or just the plaster coating? Wonder what caused it to break loose? Think I remember you saying something about big trucks on the road out front. Maybe too much vibration. Maybe it wasn't a good job in the first place. Rocklath is different than regular sheetrock, in that it has a special paper for the plaster to bond to. Plaster applied over regular sheetrock would be a problem. Today, veneer plaster is more commonly used. Again, a special plaster base - either blueboard, Durock, or fiberglass faced sheetrock - is used, with a plaster coating less than 1/8" thick. I'm planning to use that system for the new walls and ceilings, as it has a much nicer finish that taped sheetrock. Well, I hope you won't have any further problems with your head or neck.