Gai Wu
Constructing a house and covering the roof.
Gai Wu refers to the construction of a roof, including erecting the roof frame and laying covering materials like tiles or thatch. The roof is the top cover of a house. Traditionally, the selection of an auspicious day for this work is highly valued, as the smooth completion of the roof's covering symbolizes whether the home can have a proper 'top', providing shelter for the family and protecting them from wind and rain.