The top-down ceremony is
When building a house, a ritual of erecting a pillar, placing a beam, and then raising a floor.
Since the floorboard is the center of the building and the most important part, the best timber is used.
Also, when raising the floorboard, prepare rice cakes, alcohol, pork heads, pufferfish, and white paper, so that the owners, carpenters, earthworkers, etc. do not have any disasters in the newly built buildings, sacrifices are made to the earth gods and taeksin. After writing and putting it on, everyone gathers to give a feast.
This is the meaning from the dictionary.
Even if you build a church or a cathedral
The ceiling ceremony is in progress.
Proceeded today
Is this a picture of a detached house?
I hope again for a safe construction.