This accident occurred during preparatory work for the construction of
a new house for a private owner.
The work contents included installing corrugated tin sheets at the eaves of the first floor at the north side of the house by two workers. After a meeting, two workers climbed to the roof of the first floor and started working.
About 15 minutes after the start of the work, one worker noticed that he left his metal shears in his car, and moved to a portable ladder that was set against the east side of the house in order to retrieve them.
When he turned his head towards the victim who was on the roof of the first
floor, he saw the victim near the skylight (about seven meters in height
from the ground) of the second floor roof, which was not included in the
work contents for that day. Immediately after thinking this was strange,
he saw the victim fall through a sheet of styrofoam covering the skylight
and land on the unfloored part of the house on the ground.
1.Clear work instructions were not given.
2. Measures to prevent falling through the temporary styrofoam covering
were not taken.