My grandparents’ house is so old that it could collapse under the weight of the snow.
When something collapses and breaks, it is when a collapse happens. When this happens, it is destruction. It is also probably something that was already crumbling apart.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.