Скачать или смотреть What Was Stockholm Tar? The Medieval Wood Treatment That Lasts 800 Years

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00:00 DROP A COMMENT
01:24 The Lost Secret
02:06 the most dramatic charring the wood
05:24 The Critical Truth Modern Science Revealed
09:26 Historical Proof
10:43 When Modern Architects Rediscovered Medieval Wood
12:57 Why Modern Treatment Fails
14:14 Recreating the Past
17:06 A Forgotten Wisdom

SOURCES & REFERENCES
Stockholm Tar History
— Theodore P. Kaye, "Pine Tar: History and Its Uses," National Historic Ships UK, 2011
— Pine tar has been used in Scandinavia for over 1,000 years to preserve wooden buildings and boats
Yakisugi (Shou Sugi Ban) — Japanese Wood Charring
— Originated in 17th-18th century Japan during the Edo period
— Traditional "chimney method" using three boards tied into a triangular flue
The Science Behind Carbonization
— "Decay Resistance of Surface Carbonized Wood," MDPI Materials, 2022 (peer-reviewed)
— Charred wood showed mass loss of only 23% vs 60% for untreated wood
— US Forest Products Laboratory (USDA), "Durability and Fire Performance of Charred Wood Siding"
Borgund Stave Church (Built 1180 AD)
— Dendrochronological dating confirms construction in 1180-1181 AD
— Atlas Obscura, "To Save Norway's Stave Churches, Conservators Had to Relearn a Lost Art"
— Researchers studied 17th-century church records to rediscover traditional tar production
Viking Ships and Pine Tar
— Viking Ship Museum, Roskilde, Denmark — experimental research on traditional wood tar as ship primer
— Erik the Red's Saga references ships painted with "seal tar" to prevent shipworm damage
— The Gokstad ship reconstruction used approximately 600 gallons of pine tar
Modern Architects Rediscovering Yakisugi
— Kengo Kuma (Tokyo Olympic Stadium) — uses charred wood in contemporary projects
— Terunobu Fujimori — built the Yakisugi House in Nagano, Japan (2007), credited with reviving the technique
— Construction Specifier, "Burn to Last: Yakisugi's Architectural Comeback"
Why Modern Chemical Treatment Fails
— US EPA banned CCA (Chromated Copper Arsenate) from residential use in 2004
— "Environmental and Health Hazards of CCA-Treated Wood," PMC, 2021 (peer-reviewed)
— Arsenic, chromium, and copper leach into surrounding soil from treated lumber
Traditional Recipe
— 50/50 pine tar and boiled linseed oil, applied warm at 60°C (140°F), minimum 2 coats

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