Saw this photo and thought there must be more to this than just the weight of a bit of snow,not being a structural engineer how did this happen as surely the load would have been downwards on the wall,hopefully someone can explain in fairly simple terms,mods move if wrong area.
http://www.bbc.co.uk/news/uk-england-south-yorkshire-21212792
http://www.bbc.co.uk/news/uk-england-south-yorkshire-21212792