瓦当是与瓦相连的一种建筑构件。在新石器时代 ,虽然出现了立柱架梁的房屋 ,但是房顶还是用茅草覆盖。即使到了夏商周以后 ,多数还是茅草屋。只有王室或有身份的贵族 ,才有条件住上瓦屋。现在知道在郑州商城遗址中发现了瓦。虽然这不是普遍现象 ,但是瓦的出现可以说早到三千余 Vatan is a building component connected to a tile. In the Neolithic era, although the emergence of a pillar beam houses, but the roof is covered with thatch. Even after the Xia Shang Zhou, the majority is thatched cottage. Only the royal family or the identity of the aristocracy, have the conditions to live on the tile house. Now I know in the ruins of Zhengzhou Mall found tile. Although this is not a common phenomenon, the appearance of tiles can be as early as three thousand