Medieval Builders Knew Something About Stone We Forgot (And It Shows)

From Medieval Way

Medieval masons knew a secret about stone that's making modern buildings fall apart before we finish paying for them. Every foundation today takes a single afternoon to pour. A medieval wall took a generation to build. And that missing time is why the driveway at the end of your street is already cracking after five years while Salisbury Cathedral still stands 800 years later on foundations only 4 feet (1.2 meters) deep. Scientific Studies De Nardi et al. — Effect of age and level of damage on the autogenous healing of lime mortars (Composites Part B: Engineering, 2017) De Nardi — Simulation of Autogenous Self-Healing in Lime-Based Mortars (Int. Journal for Numerical and Analytical Methods in Geomechanics, 2025) Evaluating the self-healing capacity of lime and lime-based mortars (ScienceDirect, 2025) Natural Bed of Masonry Stones and Its Effect on the Stability of Historical Buildings — International Journal of Materials Science and Applications Riddle solved: Why was Roman concrete so durable? — MIT News (2023) Why modern mortar crumbles, but Roman concrete lasts millennia — Science/AAAS Making Concrete Change — Chatham House report on cement and CO2 emissions Infrastructure and Industry Data 2025 ASCE Infrastructure Report Card Bridge Infrastructure Problems in the U.S. — ASCE 2025 Historical References Salisbury Cathedral — Wikipedia William of Sens and the Rebuilding of Canterbury Cathedral Choir, 1174 — Canterbury Historical Association The Cathedral Rocks — Journal of the Bath Geological Society Stonemasonry — Wikipedia Stone Setting Practiced by the Masons of the Naumburg and Meissen Cathedrals — University of Pennsylvania Lime Mortar Technical Resources Lime Mortar — Wikipedia Lime Mortar vs Portland Cement — LimeWorks.us Identifying and Sourcing Stone for Historic Building Repair — English Heritage