Thank you to the people that responded. I didn't realize asking for recommendations were against the rules. When dealing with older homes, it's not necessarily how to repair but how to find replacements.

Recently run into a problem at a friend's home. Some the cardboard 12"\*24" ceiling tile is damaged. I read an article about replacing some damaged tile. I have been searching for awhile to find replacements similar but I cannot find where to purchase or even a manufacturers. [![see picture of cardboard ceiling tiles](https://i.stack.imgur.com/fdp6m.jpg)](https://i.stack.imgur.com/fdp6m.jpg)

From post I read - This type of tile is composed of pressed fiber material. They have edges that engage each other in a tongue-and-groove arrangement. They're typically installed on 1x2 battens running under the continuous seams.