In this episode, we explore the fascinating use of horsehairin construction materials, particularly in the rehabilitation of historicplaster at the Pictured Rocks National Lakeshore. Discover how traditionalmethods, including a mixture of sand, lime putty, and horsehair, are beingrevived to restore the lighthouse keepers' quarters. Learn about the uniqueproperties horsehair brings to the mix, adding flexibility and reducingcrumbliness, and delve into the history and engineering insights that make thisapproach both innovative and respectful of the past.

https://www.mlive.com/life/2025/07/sand-lime-and-horse-hair-pictured-rocks-uses-1900s-methods-to-rehab-lighthouse-keepers-quarters.html