There are millions of existing fire doors, and some are decades-old. When an old fire door needs to be modified, what precautions are taken to ensure that the door does not contain hazardous material? I know that some fire door cores were made of asbestos, but I don’t know if that was common for ALL fire doors made within that time period, or only certain types.
For example, if the door was manufactured in the 60’s and has a white core, how can you tell whether it’s a mineral core, or asbestos, or something else? Should the installer go ahead and modify the door, or should it be replaced?
WWYD? And who’s the industry expert on old fire doors?