The loads on the roof exceed the design or work has been done on the house that has compromised the integrity of that design,ie;interior loadbearing walls removed etc..
The roof of a cave is referred to as the "ceiling" or "overhang".
The ceiling of a cave is often referred to as the "roof" or "cave roof."
A sinkhole is formed when the roof of a cave collapses.
It depends on where the cave was...
Stalactite
Stalactites
Stalactites are found hanging from the roof of a cave, as opposed to stalagmites, which grow up from the floor. Remembering the difference is easy - stalactites are "tite" to the ceiling!
I would call it a cave in.
stalagtite
You run for your life ;)
stalagtite
to make a cave you need timber as the roof wood as the sides and base and instruction's!