I recently moved into a home that was built in 1925. Not sure what decade the basement ceiling tiles were installed. I know nothing is for sure with determining if a building material or insulation contains Asbestos without having a lab test done, but if you had to guess, would you think these ceiling tiles contain Asbestos? I have noticed that when disturbed, these tiles do show some deterioration and I can see a powdery substance fall from the tiles. I've been as careful as possible to avoid disturbing them but wanted to get some opinions. Thanks!