https://onwar.se/ 2026-09-27T16:10:05+00:00 https://onwar.se/ https://onwar.se/lib/exe/fetch.php?media=wiki:dokuwiki.svg text/html 2026-09-27T14:31:53+00:00 Anonymous (anonymous@undisclosed.example.com) https://onwar.se/doku.php?id=lyons_legacy:a_comprehensive_overview&rev=1790519513&do=diff Flat roofs have a long history, particularly in arid regions where heavy rainfall is less of a concern. Early examples can be found in ancient Mesopotamia, where flat roofs were constructed from mud and reeds. In the 20th century, advancements in materials such as reinforced concrete and waterproof membranes made flat roofs more viable for a broader range of climates.