This article, one in a series of Preservation Technology Updates, reviews the history of asbestos use in buildings, cites the US laws and regulations concerning its use and removal for public health and safety, and recommends architectural survey of historical buildings to minimize damage to original or other historically significant features in the course of asbestos survey and abatement actions. Charts summarize the asbestos-containing materials found in buildings and alternative abatement measures. An annotated list identifies organizations providing information and guidance.