The First RoofsThe roof rests on the framework of the home or shelter and have to be watertight. The primary ceiling coverings have been product of organic supplies like earth, which was typically planted with grass to make a sturdy sod. In Medieval Europe, they had been fabricated from flat pieces of stone like slate that have been tightly covered with wooden shingles. Later, roofs were made from tiles, and of thatch, bundles of reeds or grass. Thatch remains to be used for roofing material all through the world. Thatch, however was deserted by European settlers in America, as a result of the weather was so violent that thatch was subject to being blown away or broken in ways that allowed it to leak. https://www.cascadehomeimprovement.com/ Break up wooden boards have been substituted, but they also proved no match for the weather, and were quickly changed by shingles.