In 2014, Rémi Fromont and Cédric Trentesaux – architecture
students – climbed into Notre Dame’s attic and measured every beam. Out of
sight above the stone vaults stood a 13th-century timber frame so dense Parisians
called it "la Forêt" (the Forest). Each of the 1,300 beams had been hand-hewn.
The students documented each one. Five years later, fire broke out in the roof.
Within hours, the 19th-century spire collapsed, and two-thirds of the medieval
frame was gone. Thanks to the 2014 notes, France was able to rebuild the Forest
exactly as it was. Oaks were selected from forests across the country. Many had
been planted under Louis XIV to supply masts for the French navy. Carpenters
shaped the beams by hand, with axes, just as medieval craftsmen had done 800
years ago. Rémi Fromont, now one of France's chief architects of historic
monuments, led the work. By 2024, the frame was back in place, this time
protected by an automatic misting system.






